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  1. Vehicle Suspension
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  4. Rear Axle Suspension Enhancement
  5. Extra Heavy Duty
Timbren Rear Suspension Enhancement System
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Timbren

Timbren Rear Suspension Enhancement System

Part Number: TGMRCK15S
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8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use. Great Prices for the best vehicle suspension from Timbren. Timbren Rear Suspension Enhancement System part number TGMRCK15S can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Vehicle Suspension - TGMRCK15S

  • Jounce-Style Springs
  • Rear Axle Suspension Enhancement
  • Timbren
  • Extra Heavy Duty

8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.


Features:

  • Improves suspension, handling, and safety
  • Provides additional support as needed so you always have a smooth, comfortable ride
    • Allows the leaf spring ample movement while cushioning light loads
    • Becomes more rigid as more weight is added
      • Increases stability - providing great performance while hauling heavy loads
      • Reduces vehicle sag
  • Works independently - side-to-side
    • Helps compensate for off-center loads
    • Reduces body roll when swerving and turning corners
  • Acts as shock absorbers, taking the brunt of bumps and rough roads
    • Extends the life of your vehicle's suspension
  • Includes 2 Aeon hollow rubber springs, vehicle-specific brackets and hardware for simple installation
    • Replaces axle bump stops on frame
    • No drilling required


Specs:

  • Capacity: 8,600 lbs
    • Do not exceed the vehicle's weight-carrying capacity
  • Limited lifetime warranty
  • Satisfaction guarantee


An example of sag on a vehicle's rear axle under a heavy load

Whether you're hauling heavy loads in your bed or cargo area or you're towing a trailer, you will often see the rear of your vehicle sag while the front end rises. In these cases, the rear axle is handling not only the weight of the cargo, but also more of the vehicle's weight. Because less weight is on the front axle, the front tires are making less contact with the road. Overall handling - traction, steering, and braking - is negatively affected. But the resistance from Timbren's Suspension Enhancement System works with your factory suspension to keep your vehicle level and improve your driving experience.


Diagram of the Timbren spring installed

The Timbren system comes with custom-fit brackets that are bolted onto each frame rail above the rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the spring sits, 1" above the axle. The inch of clearance allows the existing factory suspension to operate normally under light loads and standard terrain, ensuring the smooth, comfortable ride that you are used to.


Animation of a standard Timbren rubber spring

Timbren Suspension Enhancement Systems are designed to work progressively. When the hollow rubber springs are compressed, the convoluted design causes them to quickly collapse along the folds. Once the folds are compacted, the stacked barrel shape increases resistance, stiffening the suspension and keeping your vehicle level.


Timbren suspension system works to prevent body roll

Each hollow rubber spring works independently to support the driver's side or passenger's side of your vehicle. This is helpful when you swerve or make sharp turns. Each spring is activated when it is needed, so body roll is greatly reduced. The independent action also works well when you are hauling off-center loads.


An example of a trailers swaying

Because the vehicle handles better with the springs, less turbulence will be passed along to the trailer, and this helps to keep the trailer in line. Your driving comfort is further enhanced if the trailer does begin to sway (from a gust of wind or a passing semi), because the movement from the trailer is not transferred to your vehicle. This also works to make the sway subside more quickly.


An empty truck on a bumpy road without Timbren

Another great feature of the rubber construction is that the springs absorb most of the road shock, creating a smoother, more stable ride overall. Wear and tear on the factory suspension is also lessened because the rubber springs work to prevent bottoming out on rough roads.


Timbren Suspension Enhancement Compared to the Competition

Timbren's Suspension Enhancement Systems are much easier to install than air springs - there are no air hoses to run, no compressors or gauges to hook up, and no manual adjustments to make. The rubber construction makes Timbren's springs more elastic than similar products constructed of microcellular urethane. And more elasticity allows for a more comfortable ride because the rubber has more travel.



GMRCK15S - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Replaces Timbren TGMRCK15E

Installation Details TGMRCK15S Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Timbren Rear Suspension Enhancement System - TGMRCK15S

Average Customer Rating:  4.7 out of 5 stars   (6429 Customer Reviews)

8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

by:
2018 GMC Sierra 1500

I know it will be lovely when loaded or the trailer on. However,it rides like a wagon empty with brand new premium shocks and struts empty. Thud thud thud. You really cannot feel the shocks or suspension. Found exact same item plentiful for 60 bucks on eBay after I bought these for 250. I may cut these in half or put air bag on. I do not like the ride empty. No hard feelings. It is a good product maybe just not for me.

Brooke M. profile picture
Etrailer Expert

Brooke M.

5/12/2023

Dont cut the springs, if you havent already! Doing so would void your warranty. The Timbren springs will definitely make for a rough ride when driving unloaded. If you arent constantly hauling, I wouldnt go with Timbren. I want to suggest part # SS45MR. These SumoSprings are a one and done install like your Timbrens but they are made from a much softer material compared to the hard rubber of the Timbren. They also have a similar price point. These will go on like the Timbrens and engage underload, but riding unloaded will be a much more enjoyable experience with the SumpSprings.

John Z. profile picture

John Z.

4/26/2024

It serves its purpose especially when hauling. I got use to thumps except when on a wavy or rough road. Zero maintenance unlike more expensive air bag. Seem to be holding up well so far. No more whining.



by:
2013 Chevrolet Silverado

From Mickey Mouse to Mighty Mouse in minutes. Pulling a 7700lb travel trailer with a 2013 Silverado w/ tow package and h/d cooling. Even with W/D hitch truck was bouncing uncomfortably. The Timbrens were an instant fix. Dips in the road are no longer a problem, and I think the sway control in the hitch seems to feel more solid as well. Unloaded ride is unchanged except for really major dips (and Texas roads have a few). If you are like me and take your truck to places your Mom would not recommend, a good underbody wash and glasses to catch any falling junk during the install are highly valued

Larry S. profile picture

Larry S.

10/17/2017

Still a happy camper after a year, and rolling along comfortably. Towing time has increased and timbrens still smooth.



by:

They do a very good job of stabilizing the rear axle of the truck when under a heavy load. Towed a 6000 lb travel trailer this week with no load leveling or anti sway bars (helping a friend). The 1500 Silverado equipped with the Timbren system did an excellent job towing the trailer.



by:

This Rear Suspension Enhancement kit were so easy to install, I was almost sure I missed something.
They installed in less than an hour. I was able to place my floor jack under the ball mount to raise the rear end enough to remove the old mounts and simply install the new ones.
Hooked up my 28' rv to my Silverado 1500 and they worked as advertised. No front end sag and I feel safer towing it.
Customer service helped me find the right product I needed without dishing out a lot of cash!

Frank  profile picture

Frank

6/19/2021

While I have sold this vehicle since this review to my neighbor, she has told me she loves this product when she pulls her rv. I now have a 34 ton pick up and purchased a set for it. I am very satisfied with the Enhancers i purchased for it!



by:

I had fantastic experience. Customer service worked with me and their engineer provided additional parts to adjust the length to match the lift on my truck, which worked perfectly.



by:

Ever since I put their rear suspensions in my pickup, it definitely Holds. the load much better and rides better.



by:
2014 Chevrolet Silverado

I have a 2014 Silverado 1500 and 24’ gooseneck weekender horse trailer. I just got the trailer and the guy I got it from recommended the Timbren’s to me. When I first dropped the trailer on my truck empty it squatted me 4.5” in the rear. The trailer weighs just under 5,000 pounds empty. When I first pulled the trailer empty I wasn’t sure about the Timbren’s they seemed really bouncy on my road. My road is not the smoothest road though. This past weekend I loaded 3 horses into my trailer and traveled about 1.5 hours away and I was blown away at how well my truck drove and handled fully loaded. With the Timbren’s my truck barely squats now. The trailer rode a hundred times better loaded with horses, which most big trailers ride bad when empty anyway. As far as driving with no load at all the truck rides just like normal. However if you hit a big hump in the road sometimes it will be enough to make it hit the Timbren’s and gives a little jolt. As far as recommending I definitely recommend these especially if you have a 1/2 ton truck and pulling a fairly heavy load.



by:
2021 GMC Sierra 1500

I just installed these on my 2021 GMC Sierra 1500 AT4. It was really easily done and only took .5 hour total. Because the AT4 is slightly lifted I did use the spacers review separately. I am towing a pretty heavy 2 axle horse trailer with a tongue weight between 6000 and 7000 pounds which the truck can handle. When I hitched up with the original bump stops the hitch dropped 4", the frame over the rear tires squatted down 2 and 3 quarters " and the frame over the front tires lifted 3 quarters". After the installation the hitch dropped only 2 and 3 quarters", the frame over the rear tires squatted down 1 inch" and the frame over the front tires lifted . Test drive went well with the same smooth ride with no load as there is no contact. Pulling the trailer went just perfect, no sway due to the trailer design, and the load was very stable with very little bounce.



by:
2020 GMC Sierra 1500

I can't wait to use these and see how they actually work with my 29' x 7.5' wide snowmobile trailer.

For reference to those with an AT-4 GMC, I have a 2020 and with a 1/2" spacer and the timbren (it was actually only 4 1/2" tall, not 5" like the images showed) have about 1.25" gap between the bottom of the timbren and the axle stop when unloaded. I was under the impression that the timbren itself was 5" based on the image in the kit on the website, #tgmrck15s, so I'm a 1/2" shorter than I wanted but I will run it for a while and see how it looks when loaded with my trailer before going any thicker with a spacer.



by:
2011 GMC Sierra

Added these Timbrens with two 1" spacers on each side on a 2011 GMC Sierra with a 2" lift. Fit great, easy to install. Was more work getting old bump stops off than installing the new Timbrens with spacers. I did need to get 2" longer bolts than what was included to complete the install, but that was to be expected.



by:
2015 GMC Sierra

Received yesterday (quick shipping!), installed today on 2015 GMC Sierra 1500 4WD Crew Cab short box. What a difference between the Timbren's and OEM bump stop from GMC. Installed for towing large travel trailer. Used floor jack under rear hitch to raise up truck to get enough room for socket to install bolts. Use 10mm socket to remove OEM bolt & bump stop, use 17MM socket to install new bolt and Timbren. Very east installation process.



by:

Very happy with product, easy installation and for light loads doesn't sag so bad



by:

Etrailer expedited the package early due to returning customer. Parts delivered in double packaged boxes. Installed in 1/2 hour after fighting the old rusty bolts. Have not had a chance to load test yet. Will give another follow-up review after truck and trailer are loaded.



by:
2013 Chevrolet Silverado

Install was straight forward; the old stops fought me a bit- a few shots of PB helped. Great install videos on your website to help me. Looking forward to towing my camper with the Timbren’s installed! I decreased 1 1/2” of rear end squat when I hooked onto my 7000 lb camper (before attaching my weight distribution bars.)
Thanks!



by:

Installed these on my 2016 Silverado. Gained almost 3/4 inch in suspension height back with a 26 foot travel trailer on the back. Much nicer ride as well. I’ll be getting them for the front when I get a plow. Very easy to install too.



by:

You guys are sick. You should start selling trailer stuff. You make a ton of $.



by:
2014 Chevrolet Silverado 1500

Great product easy to install, took me longer to take the tire off and on than install the product. I hooked up the truck to the trailer and before it stood at 39 inches and when hooked up it dropped to 37 1/2 from the floor to the wheel weld. Overall ride is comfortable with an empty truck load. Purchesed Sunday and was delivered by Wednesday. Great product



by:
2014 GMC Sierra 1500

I installed this product to help level my 2014 GMC 1500/4x4 when towing a 18ft trailer. They work great and yes I would buy them again. However it will stiffing the ride of your vehicle with no load. If you do not use your truck a lot to carry or pull loads you may not like them. They work just as instructed by the company. Took me only 15 mins to install and a good looking product.



by:

This has proved perfect for my application of towing our yacht. Leveled it up perfectly. Installed just as instructed.



by:

Very happy with my timbrens and the prompt order and delivery of them. I have them installed and look forward to towing my trailer next week. Thank you.



by:
2019 Chevrolet Silverado 1500

Real nice product. Added them to my 2019 Silverado to better support my 6000 Lbs Travel Trailer. They are a big improvement over the stock bumpers.



by:

I have a 2018 GMC Sierra 1500 pick up truck (elevation package) in which I added a 3.5 inch ROUGH COUNTRY KNUCKLE LIFT KIT with Front Struts. The rear distance between the bump stop's metal cup just under the frame and the the rear axle is 8.25 inches with an empty truck bed and a quarter tank of gas. I gave the professional this information on my truck and what I needed; they e mailed back the kit with only 1.5 additional spacers on each side of the truck, Ok. I still came up with 2.25 inch space with an empty truck bed on both sides. I feel More TIMBREN PRODUCTS WOULD be SOLD if websites carried information All together for the average people to buy at their finger tips. It would have been easier for me if the following were all grouped together for my truck :
TIMBREN Rear Suspension Enhancement System
TGMRCK15S (that has 3/8 bushing) which is actual about 4.5 inches not 5inches in
height.
FOR TRUCKS with LIFT KITS spacers are required with the same 3/8 bushings

1 inch spacer (that has 3/8 bushing) A25723-90AHOO
1/2 inch spacer (that has a 3/8 bushing) TA25722-90POO
I required an additional 1 inch spacer on both sides than I was e mailed. It would also be easier if I could buy the additional bolts grouped with my additional 2.5 spacing on both sides of my truck on the web site, than going to the hardware store. I would pay the additional cost. So all together for my 3.5 ROUGH COUNTRY LIFT, I required 2.5 inch spacers on both sides with the 4.5 height kit which = 7 inches . I haul my 4 wheeler in the bed and broke a level spring years ago. On other occasions I place fire wood in the truck bed. TIMBREN is the way to go, it will be there when I put weight in the bed of truck; be it a 4 wheeler or wood. Friends of mine have air bag systems that leak over time and are much more in price. You can not go wrong with TIMBREN. When installing, remove salt and sand near top of original bump stop bolt, apply PB blast wait 10 minutes use a breaker bar with easy removal. Go to the hardware store to get longer bolts. When installing have to jack up the back of the truck under the towing package to get space to use tools to add new TIMBREN PRODUCTS.

Joe profile picture

Joe

3/23/2022

Awesome for hauling four wheeler in bed and for hauling load of fire wood in the bed, no broken leaf springs and no sag



by:

Even using equalizing bars, I was experiencing "motorboating" when towing our travel trailer. I've had several air bag setups in the past and have always had to add air daily, so I bought the pair of Timbren suspension enhancement blocks.
Mounting took about 20 minutes.
The Timbren blocks stopped the "motorboating."
Another benefit, is my ride stays as factory without messing with air pressure at all.
Also, now I'm able to move my travel trailer short distances without installing the equalizing bars at all. My pickup stays nice and level.

Mark  profile picture

Mark

6/7/2021

The Timbren blocks are working out great! The only negative is that there is only a couple inches of freeboard travel brfore the axle contacts the blocks. When there is no load, bumps like speed bumps are a bit harsher than before. I guess that is to be expected though. Even with this slight increase in unloaded harshness, I still give this product five stars.



by:

Great product. Really made a difference in how the vehicle rides and sets when pulling our TT.



by:

Good customer service poor shipping box came open

Jenny N. profile picture
Etrailer Expert

Jenny N.

4/21/2022

I will have our Customer Service team reach out to you.


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Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Can Timbrens for 2003 GMC Sierra 1500 Be Used without Spacer
    The correct Timbren Rear Suspension Enhancement System for a 2003 GMC Sierra 1500 LD is part # TGMRCK15S for extended or regular cab models and part # TGMRCK25S for crew cab models. The springs once installed should be anywhere from 1/2" - 1-1/2" from the contact point. If you would like to decrease the gap then you can remove the spacer from the latter kit which would make the spring not engage as often.
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  • Suspension Enhancement for a 2007 Chevy Silverado Classic Towing a 5th Wheel Trailer
    The pin weight of a 5th wheel trailer is typically going to be much less than the 12,000 pounds springs # TGMRTT35S are rated for. So there is really no need for such a high capacity spring set. I recommend Timbren springs # TGMRCK15S rated for 3,600 pounds. This set should not interfere with the 5th wheel install kit because they mount to the bottom of the frame. I have linked a video showing a typical installation and a link to the instructions for you. If you want a little more capacity...
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  • Comparing Unloaded Ride Quality of Firestone Air Bags to Timbren Suspension Enhancement
    If you are looking for something that will not impact your ride quality when you aren't towing, the Firestone Ride-Rite Air Helper Springs - Double Convoluted - Rear Axle # F2430 are the way to go. The Timbren Rear Suspension Enhancement System like the # TGMRCK15S is pretty stiff and has a tendency to impact ride quality when unloaded as you go over bumps in the road and the jounce-style springs make contact. Since the # F2430 is adjustable, this can be avoided. When you aren't towing...
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  • Rear Suspension Enhancement Recommendation for 2010 Chevy Silverado 1500 Z71 4WD Crew Cab
    The best suspension enhancement we offer for your 2010 Chevy Silverado 1500 is the RoadActive Suspension Kit part # RAS54FR which will give you the support you are wanting for the trailer you plan to tow while improving loaded and unloaded ride quality as well as handling and stability. Other options, specifically Timbrens, are known to make the ride quality a bit harsher which is why I don't typically recommend them unless the vehicle will be loaded down nearly all of the time.
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  • Recommended Rear Timbren Spring Clearance On A Lifted 2014 Chevrolet Silverado
    Per the manufacturer's recommendations, there should be approximately 1"-1.5" of clearance between the rear contact point and the Timbren Rear Suspension Enhancement part # TGMRCK15S when not under load. Too little space will cause the spring to constantly ride on the axle/bracket resulting in a bouncy uncomfortable ride where as, a spring to far from the contact point will not allow for the full capabilities of the spring to be exerted. Since you currently have 1"-1.5" of clearance, I...
    view full answer...
    Image 1 for
  • Using Lift Spacers for Timbren Springs on a Lifted 2011 GMC Sierra
    I can gladly help you with your spacing problem but I am going to send you in the direction of another product. SumoSprings will not work for your application. I recommend going with the Timbren Rear Suspension Enhancement System item # TGMRCK15S. They have an 8,600 lbs capacity. They have hollow rubber springs that sit above the rear axle to help stabilize and level your GMC Sierra. They also provide a more comfortable ride by absorbing road shock and improving roll stability. The springs...
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  • Timbren Helper Springs for a 2003 Chevy Silverado 1500 Light Duty
    Timbren helper springs # TGMRCK15S will fit your 2003 Chevy Silverado 1500 light duty. The videos are trucks our customers brought us for the installation. We haven't had someone bring in a 2003 for this product so there isn't a video. But installation on your 2003 will be nearly identical to the 2005 which I have linked for you.
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  • Timbren Suspension Enhancement Recommendation on 2014 GMC Sierra 1500
    Suspension enhancement for your 2014 GMC Sierra 1500 is a good idea and will provide a more level and comfortable ride when towing your new travel trailer. According to Timbren, the Rear Suspension Kit part # TGMRCK15S-M2 mentioned in your question is a special kit designed more for lowed trucks. I recommend the 6,000lb Timbren # TGMRCK15S system as this is a confirmed fit for your vehicle and will give you plenty of room to work with at the listed weight capacity. I have included a...
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  • How To Fix Rough Ride with Timbrens On 2017 Chevrolet Silverado 1500
    The Timbren Rear Suspension Enhancement System part # TGMRCK15S is a great option to help reduce sag while towing with a 2017 Chevrolet Silverado 1500 but they do have a tendency to ride rough as the material is very dense. I think the perfect option for a compromise between support and comfort are the SumoSprings Solo Custom Helper Springs part # SS95MR. These ride much smoother than Timbrens and still provide support for towing or hauling.
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  • How to Remove Factory Bump Stops in 2020 Chevy Silverado 1500
    To remove the existing bumpstop, you'll need a 10mm socket and a 6 inch extension. I've linked to an install video that you might find helpful.
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  • What Are The Differences Between The Timbren TGMRCK15S And TGMR15MR For A 2021 GMC Sierra 1500
    These two Timbren rear suspension systems are the same except for two major differences. They are both compatible with your 2021 GMC Sierra 1500. They are each rated at 8,600 lbs and are rated extra heavy duty. The differences are the Timbren Rear Suspension Enhancement System, part # TGMRCK15S, is jounce-style spring that replace axle bump stops on your frame and it does NOT fit vehicle's with equipped with Adaptive Ride Control. While the Timbren Suspension Enhancement System - Rear Axle,...
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  • Difference Between the Timbren and Supersprings Suspension Enhancement Systems on a 2015 Silverado
    While it will not hurt your vehicle, using two suspension enhancement products at the same time could render one product ineffective or will cause one system to be used at limited potential. For example, if you try using both the Timberen Rear Suspension Enhancement System # TGMRCK15S and the SuperSprings Suspension Stabilizer # SSA5MTKT, with a load in the truck, once the Timberen Springs engage the SuperSprings will not be doing much for the load. I do not recommend using both systems...
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  • Suspension Enhancement Recommendation for 2015 Chevy Silverado 1500 that Is Not an Air Bag
    We have great suspension enhancement options for your 2015 Chevy Silverado 1500 that will help support the rear suspension. The Timbren kit part # TGMRCK15S is a confirmed fit and is a jounce bumper style of kit instead of an air bag. This means you get all of the support without having to inflate air bags at any point.
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  • Recommended Rear Suspension Enhancement For 2021 GMC Sierra 1500 AT4
    The correct Timbren Rear Suspension Enhancement for your 2021 GMC Sierra 1500 AT4 is the Timbren Rear Suspension Enhancement System # TGMRCK15S you were looking at which has an 8600lb load rating, but I have a different option for you. I recommend going with the SumoSprings Solo Custom Helper Springs - Rear Axle # SS45FR which have a load rating of 1500lbs which is plenty for your 6500lb travel trailer since the only weight that gets put on the rear suspension of your truck is the tongue...
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  • Which Timbren Kit Fits 2018 Chevrolet Silverado 1500 without MagneRide
    We have a Timbren kit that fits your 2018 Chevy Silverado 1500 without MagneRide but the part # TGMRCK15MR is the version that is for the Magneride. So instead what you'd want is the part # TGMRCK15S.
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  • Timbren Suspension System Recommendation for a 2014 GMC Sierra 1500
    The difference between the two Timbren systems you referenced is the application for each. The Timbren Rear Suspension Enhancement System - Severe Duty # TGMRTT15S is designed for service vehicles only so it would not work for you. The # TGMRCK15S would make an excellent choice for a suspension enhancement system for your vehicle. This system has plenty of capacity for the ton of pellets you carried, and is great because when your vehicle is unloaded your ride quality will be exactly the...
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  • How Do You remove a Rear Bump Stop On A 2021 Chevy Silverado
    When we removed the rear bump stops, we found that by using a 10 mm socket and ratchet to take the bolt down. You may have to switch to a smaller ratchet but still using the 10 mm socket to get it completely off, and after you finished taking them off you add install the Timbren Rear Suspension Enhancement System. I put an installation video below.
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  • Can a Timbren Suspension Kit be Used with Weight Distribution System
    Yes, you can use a Timbren system like the part # TGMRCK15S with a weight distribution hitch on a 2017 Chevy Silverado 1500. If you have the WD system already you'll have to go through the setup process again after the Timbren install since you'd need less spring bar tension.
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  • Recommended Round Bar For Weight Distribution And Suspension Enhancement For 2010 Chevy Silverado
    I recommend the Replacement Spring Bar for Curt Round Bar Weight Distribution System - 800-1,000 lbs TW, # C17115, if your loaded tongue weight is 900 lbs. If it is higher than that, you will want the Replacement Spring Bar for Curt Round Bar Weight Distribution System - 1,000-1,500 lbs TW, # C17117. I do recommend getting a suspension enhancement system for your 2010 Chevy Silverado. If you want air springs for a 1500, I recommend the Firestone Ride-Rite Air Helper Springs - Double...
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  • Best Way to Fix Sag When Towing with 2020 Chevy Silverado 1500
    Suspension enhancement would be a good idea to get rid of the squat you are experiencing when towing with your Fastway E2 weight distribution system. The best option is the RoadActive Suspension kit part # RAS54FR which gives you the support you want to reduce the sag but unlike other options will improve the ride quality and handling when loaded or unloaded. Other options like air bags will give you the support but won't improve ride quality which is why we recommend these so highly. The...
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  • What is the Height of the Springs in Timbren Suspension Enhancement Kit # TGMRCK15S
    I went out to the warehouse and pulled Timbren kit # TGMRCK15S to take some measurements for you. The overall height of the spring is 5-1/8 inches and the overall width is 4 inches (diameter). Timbren does make some 1 inch spacers, # A25723-90AH00, that you could use if more height is needed. This may result in the need for longer bolts that you would need to obtain locally. Use grad 5 or better bolts.
    view full answer...
  • Will the Timbrens Help with Worn Out Leaf Springs on a 2005 GMC Sierra 1500
    If the leaf springs on your 2005 GMC Sierra are worn out then the Timbren Rear Suspension Enhancement System part # TGMRCK15S will engage more frequently. This would help your leaf springs from wearing further but this may also have an adverse affect on ride quality. The best option and what I recommend is to replace the leaf springs and then add the Timbrens but as stated, these will prevent your springs from wearing further so they can get you by until you are able to replace the leaf...
    view full answer...
  • Best Way to Reduce Body Roll on a 2015 GMC Sierra 1500
    The Timbren Rear Suspension Enhancement System part # TGMRCK15S and the SumoSprings Custom Helper Springs Kit part # SSR-209-40 are both great options to help reduce the body roll you are experiencing while loaded. Neither of these suspension enhancements will affect the ride of your vehicle while unloaded for the exception of the occasional bump or pothole. While loaded the Timbren springs will give you the most support and the SumoSprings will give you the most comfortable ride. For...
    view full answer...
    Image 1 for
  • Suspension Enhancement Recommendation for a 2014 GMC Sierra 1500 Towing Trailer Causing Sag
    For adjustability you can't beat the air systems like the part # F2430 for your 2014 GMC Sierra 1500, but I think your best option would be the part # TGMRCK15S since you don't want to mess with the air bag systems. The Timbren will provide you suspension support that will only be there when needed. This will greatly reduce the sag of your rear suspension and won't require you to maintain air pressure like the air systems do. I attached an install video for you to check out as well.
    view full answer...


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Video Edited:
Zack K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Andrew K
Video by:
Andrew K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Ethan H
Video by:
Ethan H
Employee Nicholas E
Test Fit:
Nicholas E
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee Kevin C
Test Fit:
Kevin C
Employee Cole B
Installed by:
Cole B
Employee Mary K
Updated by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Anna W
Updated by:
Anna W
Employee Michael B
Updated by:
Michael B
Employee Carrie F
Updated by:
Carrie F
Employee Bethann B
Updated by:
Bethann B

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