bing tracking image
  1. Vehicle Suspension
  2. Timbren
  3. Bump Stops
  4. Towing/Load Leveling
  5. Standard Duty
  6. Rear Axle Suspension Enhancement
THIS ITEM IS NOT A FIT FOR
2008 BMW X5
Timbren

Timbren Rear Suspension Enhancement System

Part Number: TGMRSB4S
In Stock
$269.36
Retail:$398.07
You Save: $128.71
Vehicle Suspension
Not Confirmed to Fit

2008 BMW X5

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

Videos

3,600-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 TGMRSB4S can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (6118)
  • Q & A (0)
  • Photos

Timbren Vehicle Suspension - TGMRSB4S

  • Bump Stops
  • Towing/Load Leveling
  • Timbren
  • Standard Duty
  • Rear Axle Suspension Enhancement
  • Suspension Only

3,600-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 when towing or hauling gear
    • 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


Specs:

  • Includes 2 Aeon hollow rubber springs, vehicle-specific brackets and hardware for simple installation
    • Replaces axle bump stops on frame
    • No drilling required
  • Capacity: 3,600 lbs
    • Do not exceed the vehicle's weight-carrying capacity
  • Designed to work with a suspension system that is in good working order
  • 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 when loaded. 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 when loaded or towing because the rubber has more travel.



GMRSB4S - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Installation Details TGMRSB4S Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

4.7

3512 reviews
5 Stars
(2794)
4 Stars
(457)
3 Stars
(113)
2 Stars
(69)
1 Star
(79)
3,600-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:

Product arrived on time and does exactly what it describes. Little stiffer ride without a load but with a load it made my truck handle so much better at low and high speed.



by:

Yes about one year ago i installed this product with excellent results so far.



by:

What a great product. This has made a night and day difference pulling a 5th wheel.



by:

Easy installation. Good quality.



by:

Very efficient and great to work with. Will definitely use your company again. Thanks



by:

Works pretty well. Does stiffen the factory ride considerably when not hauling a load.



by:

Just as overtired , they stiffened up the ride , plus no more sag in rear ended of truck .



by:

Worked great. My Tahoe no longer says in the rear. Can’t even tell a difference when I hook my trailer up.



by:

Installed in about 15 minutes,very easy.I pick up my new truck camper next week so I do not know how it works yet,but looks like it will work like its suppose too



by:

Fast shipping



by:

Product does not help rear swag with fifth wheel camper but a half inch. On brand new truck as well. Not happy with product. Called to return them and want me to pay 27.00 shipping and stated in email that was sent to me I couldn’t return if installed. I’m not understanding this ? Do not buy ! I won’t be doing any more business with etrailer . Not helpful at all



by:

Shipping was fast, product looks to be well made.



by:

Easy to install and does not affect the ride till you have a load, then they help support the load. Good product!



by:

as expected,fast shipping



by:

I have always had a good experience with doing business with you



by:

Quick service and as described.



by:

Great service and quick shipping



by:

As always amazing customer service and products to match.



by:

I just installed them yesterday. Super easy, took maybe 25 minutes. Looking forward to towing my toyhauler soon.



by:

Very easy installation!



by:

I'm very happy with the fast service. Timbren makes quality parts and now my problems are solved. I get a smooth ride and the truck does not sag . Thank you



by:

Great cost effective way to keep truck level. Easy install! A 15 minute job. Does not affect empty ride quality. Extremely happy with the product and etrailer.com



by:

Fast delivery and easy installation



by:

Showed on time and easy installation. This is why I continue to be a loyal customer.



by:

Great Product, arrived quickly and packaged well.

Will be buying from them in the future.


25
3512
Show More Reviews

See what our Experts say about this Timbren Vehicle Suspension

  • Suspension Enhancement Recommendation for 2008 GMC Yukon XL with Auto Level Suspension
    Since you have the auto leveling suspension on your 2008 GMC Yukon XL you'll need suspension enhancement that replaces the bump stop of your suspenion like the Timbren kit part # TGMRYS4 for if you have a 1500 or the part # TGMRSB4S for if you have a 2500.
    view full answer...
  • Timbren Springs Not Lining Up with Axle Bracket on 2004 GMC Yukon XL
    Is it the additional spacers that are causing the main part of the spring to out of alignment compared to the stock bump stops on your 2004 GMC Yukon XL? Are the Timbren springs fully seated in the bump stop cups? On these vehicles it is hard to manually push them into place. We usually use a block of wood and slowly put weight back on the axle so that the wood and the weight will push the springs into the bump stop cup. And I know you have the Z71 springs but is the Yukon itself 4-wheel...
    view full answer...
    Image 1 for
  • Recommended Suspension Enhancement For 2005 Chevy Suburban 2500
    For your 2005 Chevy Suburban 2500 4x4, I recommend the Timbren Rear Suspension Enhancement System # TGMRSB4S. This will stabilize your vehicle to significantly reduce that sag by using the Aeon Rubber that becomes more rigid as more weight is added. These springs are extremely well suited for towing, they just don't have the adjustability of the air springs, which you may not even desire. This will work just as well as the air springs, but the air springs have a little smoother ride....
    view full answer...
    Image 1 for
  • Timbren Suspension Enhancement Fit on 2001 Chevy Suburban 2500
    We do have the exact Timbren rear suspension enhancement you need for your 2001 Chevy Suburban 2500, though you are right that the part you mentioned is not the correct fit for your vehicle. Instead, the correct part that I can confirm does fit your 2001 Chevy Suburban 2500 is the following: - Timbren Rear Suspension Enhancement System # TGMRSB4S These are going to fit your Suburban and provide you with the upgraded suspension support you need.
    view full answer...
  • 2009 Chevy Suburban Z71 Sags at the Back with a Trailer Connected
    A properly rated weight distribution that is set up correctly should eliminate the sag you are experiencing on your 2009 Chevy Suburban. It is possible that the spring bars on your EAZ Lift system are rated too low and thus cannot eliminate the sag. If the trailer tongue weight is 1,000 pounds then the spring bars need to be rated higher than that. A system that is rated for 700 to 1,400 pounds tongue weight, such as # RP66561 would be a great option. You could also add rear helper springs...
    view full answer...
  • Recommended Suspension Upgrade for a 2005 GMC Yukon XL
    Hey Charlie! The Timbren item # TGMRSB4S isn't going to be a fit because it only works with the 2500 Yukon's. From what my system tells me the 2005 GMC Yukon XL Denali AWD is a 1500 model. In that case you would need the Timbren item # TGMRYS4. The Timbren item # TGMRYS4 do bolt up where the bump stop used to be. I have linked an installation video below along with the instructions so you can see how easy these are to install. To answer your question though. Yes, the Timbren item # TGMRSB4S...
    view full answer...
  • Can a 2002 Chevrolet Avalanche 2500 Tow a 5th Wheel or Gooseneck Trailer
    I do have options for you to tow a heavy trailer with your 2002 Chevrolet Avalanche 2500 but a gooseneck or 5th wheel trailer would be off limits. The reason for this is not so much as the weight of the trailer is more than the vehicle can handle though it would be a stretch but more so that the configuration of the truck bed does not allow for turning clearance. The Chevrolet Avalanche only has a 5' bed and the bed rails further limit turning clearance therefore you would most likely be...
    view full answer...
  • Can I Tow A 5th Wheel Trailer With A 2004 Chevy Avalanche?
    I do not recommend attempting to pull a 5th wheel with that vehicle. The Avalanche may have adequate towing capacity for smaller 5th wheel campers. My main concern is configuration of the truck bed and that it would not allow turning clearance. That being said I do not offer a 5th wheel hitch install kit that will fit this vehicle. Basically 5th wheel or gooseneck towing with this vehicle would be a no-go. You can certainly still tow with this vehicle but you would be limited to bumper...
    view full answer...
  • Helper Springs for a 2002 Chevy Avalanche Z71 with 6 Inch Lift
    Since the springs are longer than stock on your 2002 Chevy Avalanche air bags that fit inside the springs, such as # F4108 will not work. There are not spacers available that would work either. But I do have a solution for you. You could use Timbren springs # TGMRG25C for a 1500 or # TGMRSB4S for a 2500. Then you would need 8 of the 1 inch spacers, # A25723-90AH00, 4 for each side. Timbren does not recommend using any more spacers than that so there will still be a little travel before...
    view full answer...
    Image 1 for
  • Suspension Enhancement for a 2002 GMC Yukon XL
    Suspension enhancement products such as the SumoSprings # CSS-1168R are designed to be used with a stock suspension that is in good working order. It sounds like the rear suspension on your 2002 GMC Yukon XL is starting to fatigue some, hence the greater than normal squat, and it would be a good idea to inspect the suspension and replace worn parts as needed. At that time it would be up to you to add stronger springs or suspension enhancement. Please note that adding stronger springs is...
    view full answer...
  • Rear Suspension Enhancement that Fits 2011 GMC Yukon XL
    That Timbren only fits the 2500 model Yukon XLs. For a similar suspension enhancement kit that does fit your 1500 2011 GMC Yukon XL you'd want the part # SSR-204-40. This will give you the support you are wanting but will offer a smoother ride quality.
    view full answer...
  • Adding Rear Helper Springs to a 2001 GMC Yukon XL with Auto-Leveling Shocks
    I do have a solution for you but there are no air bag systems that work on the 2001 GMC Yukon XL with the auto-leveling feature. What you can do is use some Timbren springs which will engage only if they need to (if the vehicle sags enough). With the auto-leveling system and the weight distribution adding the Timbren springs will make the rig very solid. If you have a 1500 4x4 use # TGMRG25C If you have a 1500 2-wheel drive use # TGMRYS4 If you have a 2500 4x4 use # TGMRSB4S And if you...
    view full answer...
  • Weight Distribution System to Reduce Rear Sag in 2012 Chevy Suburban Towing Camper
    If you already have the RoadActive Suspension system # RAS4611 installed in your 2012 Suburban and you still have rear sag when your camper is hitched I recommend using a weight distribution/sway control (WD/SC) system if you do not already have one. You could add Timbrens but WD is a better option. Weight distribution will do more to level the Suburban and eliminate the rear sag than adding a set of Timbren jounce springs since WD/SC systems actually shift trailer tongue weight forward...
    view full answer...
  • Difference Between Timbren Springs for 2004 Chevy Suburban 1500 and 2500
    The Timbren Rear Suspension Enhancement System # TGMRYS4 that fit a 2004 Chevy Suburban 1500 and Timbren Rear Suspension Enhancement System # TGMRSB4S that fit a 2004 Chevy Suburban 2500 are different products that install differently and have a different affect on their vehicles, hence the 6,000 lb capacity for the springs that fit the 1500 and 3,600 lb capacity for the springs that fit the 2500. This is simply the capacity that Timbren's engineers determined after their product testing. I've...
    view full answer...
  • Does Timbren Suspension Kit TGMRSB4S Fit 2002 GMC Yukon XL
    Hey Galen, yes the Timbren suspension kit part # TGMRSB4S that you referenced does fit your 2002 GMC Yukon XL 2500. I apologize for any fit confusion on our part!
    view full answer...
  • Suspension Enhancement Recommendation for 2013 Chevy Suburban 2500
    While we don't have air bag style suspension enhancement kits that fit your 2013 Chevy Suburban 2500 we have the Timbren part # TGMRSB4S as a fit that will give you the support you are wanting and have the advantage over air bag kits of being easier to install and not ever requiring you to worry about air leaks or proper air pressure. After the kit installs you'll basically never have to worry about it again.
    view full answer...
  • Suspension Enhancement Recommendation For 2012 Chevrolet Suburban LT Without Airride
    If your 2012 Chevrolet Suburban is a 1500 series, the Air Lift Vehicle Suspension, part # AL60769, will work for you. These air springs fit inside your existing coil springs, adding support when hauling heavy loads, and Improves handling, braking and overall ride. No drilling is required for installation. The air pressure is adjustable from 5 to 35 psi. I would also recommend the Air Lift Load Controller II Compressor System for Air Helper Springs, part # AL25592. This system automatically...
    view full answer...
  • Recommended Suspension Enhancement Kits for 2001 Suburban 2500 with AutoRide Leveling System
    The AutoRide self-leveling and damping suspension system in your 2001 Suburban 2500 uses various sensors in the vehicle to control a compressor pump that continuously varies shock damping while driving. This system cannot be defeated and aftermarket air springs like the Firestone Ride-Rite cannot be installed on the vehicle according to my contact at Firestone. However, you can install a set of rubber jounce spring such as the Timbren front-axle kit # TGMFK25S and rear-axle kit # TGMRSB4S....
    view full answer...
  • Will the SumoSprings Custom Helper Springs Kit # SSR-204-40 fit a 2004 Yukon Denali XL
    As long as your 2004 GMC Yukon Denali XL is a 1500 the SumoSprings Custom Helper Springs Kit # SSR-204-40 you referenced would work for you. If you have a 2500 you would want a Timbren Rear Suspension Enhancement System # TGMRSB4S as this is a similar system that will work on a 2500.
    view full answer...
  • Height of Rubber Portion of Timbren Part # TGMRSB4
    Just the height of the rubber portion of the Timbren part # TGMRSB4S is 5-1/8 inches.
    view full answer...
  • Correct Spacers for Timbren Rear Suspension Enhancement System on 2011 Chevy Suburban
    Timbren makes spacers specifically for the Timbren Rear Suspension Enhancement System # TGMRSB4S on your 2011 Chevrolet Suburban 2500. You have the option of using the Timbren 1" Spacer For Raised Frame Vehicles - 3/8" Bushing # A25723-90AH00 or Timbren 1/2" Spacer for Raised Frame Vehicles # TA25722-90P00. Typically you want to see 1/2" to 1-1/2" of space after installing the Timbren system. Since your lift is about 4" you will likely need 4 of the 1" spacers on either side but you may...
    view full answer...
  • Recommended Timbren Helper Springs on 2006 GMC Yukon XL Denali AWD
    For your 2006 GMC Yukon XL Denali AWD, the Timbren Rear Suspension Enhancement System # TGMRG25C is a fit for the 1500 series and the # TGMRSB4S is a fit for the 2500 series. I've attached a video as well as the installation details to assist.
    view full answer...
  • 2004 GMC Yukon Timbren Suspension Kit Recommendation for Front and Rear Axle
    For your 2004 GMC Yukon XL we have the Timbren suspension kit part # TGMFK25S which fits the front suspension and then the part # TGMRSB4S which fits the rear. Both of these kits act like bump stops except are much larger to make contact sooner than the standard bump stop so that they can provide additional suspension support.
    view full answer...
  • Timbren Suspension Enhancement for 2004 GMC Yukon XL 2500 Quadrasteer
    Yes the Timbren kit part # TGMRSB4S does fit your 2004 Yukon XL 2500 with Quadrasteer.
    view full answer...


< Previous
12



Do you have a question about this Vehicle Suspension?


Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Mary K
Updated by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
Michael B
Employee Carrie F
Updated by:
Carrie F
Employee Lincoln B
Updated by:
Lincoln B
Employee Jonathan Y
Video by:
Jonathan Y
Employee Robert C
Installed by:
Robert C

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


Product Experts Available Now!
Call 1-800-940-8924
<