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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.
Features:
Specs:
Whether you're hauling heavy loads in your bed or cargo area or 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 vehicle 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.
The Timbren system comes with custom-fit brackets that are bolted onto each frame rail above your rear axle. Hollow rubber springs are bolted to the bottom of the bracket and hang down to where the bottom of the leaf 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.
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.
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.
Because your 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.
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'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.
Average Customer Rating: 4.7 out of 5 stars (3488 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.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 R - 06/19/2021I 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.
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.
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 - 10/17/2017Even 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 V - 06/07/2021Product is perfect, delivered in good order and a fair and reasonable price. Much easier to use than other systems available such as air bags. All good, all work, but in this application this product is perfect for my needs.
Steve S - 05/11/2021I 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.
I was worried about getting a bumpy ride after installation like some of the reviews stated. I'm happy with my purchase, these timbren suspension did not disturb ride quality.
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.
Didn't like the ride at all, didn't really help my truck. Had it on for 1 day then went back to stock. Very rough ride, didn’t matter if I was pulling a trailer or not. Used them very little,they’re sitting on my shelf. What a waste of money.
Heather A - 07/03/2021I bought the wrong product--these did not solve the problem I was faced with--no fault of Timbren. They did work as designed, and were easy to install. I had hoped they would help control the galloping problem I was having when towing my travel trailer--but instead they caused a noticeable "thump" every time we went over a bump or an undulation in the road while the galloping continued. I simply did not have enough rear suspension to handle the trailer tongue weight (even though I was within payload limit at the scale). Solution turned out to be a bigger truck, lesson learned.
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.
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.
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.
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.
I took them off...and put air bags in. I didn't like the truck bottoming out even when empty. I wish I new someone that could use them.
Jon G - 07/15/2021These things are great! They ride smoothly when I tow my 29ft 5th wheel. I added the 1 inch spacers because of my 2 inch lift. I have about 1 1/4 inches of clearance when I don’t have any load. I like this better cause I never hit the Timbrens when I tow a lighter load like a boat or small trailer. I had Timbrens in my old truck and had about 3/4 inch of clearance and I could feel them touch with a light load or even a bigger bump in the road
If your rear torque lift camper tie downs were not so expensive I would buy some of those also.but I think almost 400 is way to much money so I will buy some from a different company
I installed the Timbren jounce bumpers on my 08 Silverado to aid in trailer towing. They definately stopped any tendency to porpoise in conjunction with my Curt hitch. They also leveled out the combination truck and trailer. The only downside(?) is that the wife complains about the bouncy unloaded ride due to the fact the bumpers do not have a lot of clearance from the axle, she said it rides like a truck 8>). The install was fairly easy, it was harder to remove the old bumpers than it was to install the Timbrens'.
Ronald E - 06/27/2020Great 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
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.
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.
These timbren springs completely stopped my truck from sagging when hauling heavier loads and have made for a much smoother ride. I highly recommend these.
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!
Love these things, best thing I ever installed on my truck and supper easy to install. Particularly with the 2020 Chevy Silverado, the holes for the bump stops are threaded so all I needed was a little red lock tight and that was it holding great. I installed the 1/2" spacer along with the metal spacer that comes with it and it brought the Timbrens a lot closer to the axle (1/2") so there is less squat under load, which is what I wanted; however, it does cause a rougher ride if the tires go over anything more than a seems in the concrete. I could have bought these directly from Timbren, but you really can't beat e-trailer customer service.
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