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  1. Vehicle Suspension
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  3. Jounce-Style Springs
  4. Rear Axle Suspension Enhancement
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Timbren Rear Suspension Enhancement System

Timbren Rear Suspension Enhancement System

Item # TGMRCK35S
Retail:$468.32
Our Price: $398.07
You Save: $70.25
Vehicle Suspension

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8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your . 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 TGMRCK35S can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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2006 GMC Sierra - Timbren Rear Suspension Enhancement System

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

8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your . 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


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: 8,600 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. 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.



GMRCK35S - Rear Suspension Enhancement System with Aeon Hollow Rubber Springs by Timbren

Installation Details TGMRCK35S Installation instructions


Customer Reviews

Timbren Rear Suspension Enhancement System - TGMRCK35S

Average Customer Rating:  4.7 out of 5 stars   (5992 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:
GMC

I have purchased two sets of timbren rear suspension products for my 04 gmc and 21 gmc both set preformed as promised don't have o4 any longer but last I heard still doing there job. Have ordered several products from e-trailer great customer service and ease of ordering. Very satisfied with tibren and e-trailer would recommend to anyone.



by:

Just received the Timbren TGMRCK35S. It was a very simple install. I didn't even need to jack the truck up or take the tires off. This product seemed high in price for what you get. The truck always squatted low and bottomed out on bumps whole pulling my 5th wheel. I haven't really had these long enough to make a fair assumption on them. I would say check back with me at the end of the summer. By then I will have traveled great distances pulling my 5th wheel. Definitely seems as though they will work for what I has purchased them to do.

Robert N.

2/23/2018

I have since removed this suspension enhancement system. It worked great took out the sag, prevented body roll, all it said it would do. I just could not get my 5th wheel to ride level with them because there was little to no squat. The front of the camper road high. I couldnt get it any lower with my hitch set up. More weight was thrust onto the rear axle on the 5th wheel and those two tires wore out quickly. I just dont know what caused it. Incorrect axles originally built on the camper, overloaded, or what. As I said, this system works great but I just never checked into why I had issues



by:

The package arrived today at 12:30pm and we’re on my truck by 2:00pm and I’m slow. I’m exited to see how they perform with a load on my pickup



by:

Really great service, your staff were helpful in identifying the product I needed for my vehicle, processed the order quickly, and within hours my order was shipped. Thanks folks, that is the way I like to do business.

Charles

5/8/2022

This product has been on my truck for a year now, and with more than dozen long trips with truck fully loaded, these cushions have keep my truck level and well clear of the frame. Id still give them 5 Stars after a year of use.



by:

Easy to install. Takes out the "harshness" over poor roads.



by:
2009 GMC Sierra

Awesome product awesome service awesome delivery just simply awesome



by:

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.



by:

About a 1/2 inch difference in gap at the bump stop perch but still within parameters. Truck sits perfect with trailer attached. Haven’t towed yet. After towing if they perform like they should will upgrade to a 5 star. Easy to install, definitely needed 2x4 and jack. 2011 Silverado ext cab with 30 ft Genisis 5th wheel.



by:

Was able to install these with a 15mm flex head ratchet wrench and lifted the rear of the truck to make it easier. 30 minutes to take off 4 nuts and put em back on. 2 minutes assembling the timbrens with the added spacer. I have a f350 with a salter and plow. Loaded with salt the lights shoot up and in the snow ?? it’s like hitting hyper drive and you’re blinded. These helped big time. Very happy so far.



by:

Haven’t had it on long, but so far so good. 1999 F350 dually. Bolted up nicely. Total job took 10 minutes. Have hauled two gooseneck loads of hay and truck drives SO much better. Nice and level. Money well spent so far.



by:

The pro: The longer, heavier bump stops worked great when hauling my mustang home from Chicago. The truck stayed level and handled great.
The con: I had to remove the bump stops for everyday use. They limited my suspension travel causing a stiffer ride.



by:

I am so glad I bought these for my truck. I was able to install them myself using a jack and jackstands. The ride is bit rougher now; but the suspension is totally awesome compared to before. I am able to haul a bit more weight when needed.



by:

very good product ,received just in time and fit perfectly on my GMC savana 2000 .Be sure to clean the two receptacle thats help.
très bon produit , reçu dans les délais et s'ajuste parfaitement . Assurez-vous de nettoyer le receptacle cela facilite l'installation.



by:

The timbrens actually did what they were suppose to do. However, once I starter driving out west I notice the timbrens were riding on the axle which cause the speedometer to jump around depending on the road. I would recommend them if you are hauling or towing a camper or RV. I was going to contact etrailer about maybe removing a spacer for one set however the other set came as one unit. The bottom line is the Timbrens does stabilize your load for safe travels. I will be contacting etrailer soon to assist in correcting the problem...Road trip from Idaho,Colorado,Wyoming,and Utah were beautiful... Thank you etrailer



by:

Definitely a must have when towing..stiff without a load but night and day difference while towing my travel trailer, better traction, steering and braking. Easy quick install..only issue I had was with the long bolts they sent with the spacer kit (optional for lift) the bolt diameter was too wide to fit through the holes on the bracket..but a trip to the local hardware store took care of that.



by:

Pros: Cheaper and easier to install than airbags, do the job when load is enough to compress the shock, with added weight or towing, then it stiffens the rear very nicely.
Cons: Doesn't do anything until there is 2-3cm of compressed shock. It sits above the contact point, doesn't touch. Under normal driving, there is no benefit/improved stiffness/anti sway in rear or a leveling of the factory rear sag in a 2022 or newer Toyota Tundra.
If had it to do over, would have put some kind of spacer in between product and upper included bracket, the supplied bolt is long enough to accommodate, to eliminate the gap, and lift the rear 1-2 cm. Should do it anyway, maybe when swapping to summer wheels next month.



by:

I’d seen similar products rated in the 4,000 lb ratings but I went with these. I’m not a mechanic but I removed the factory bump stops and installed both these in 30 minutes or less. I used my rolling jack and lifted from the drop hitch and easily removed the old ones and soapy water and 1/4 twist and these were on. Placed a block of wood in the space between these coils and lowered the jacks then pressed it with my tractor to confirm full engagement. I carry a lot of tools on a 2020 Chevy 2500 I do feel a bit of butt bounce on large bumps but other than that I’m very pleased.



by:

The order with Will at etrailer was great. He was very helpful and knowledgeable, Installation was not easy but not too bad, The hardest part was removing the factory pieces I removed them from below which was a blind nut removal operation. This is on a 2017 Mercedes Sprinter motorhome. After removal of the factory pieces I discovered that access is much easier on top between the tire and the mud flap, I turned the front wheels inward and they didn't have to be removed. The front of the motorhome had to be raised quite a bit to get the Timbren piece jnserted. Also I learned to tighten the bolt and nut in the Timbren bumper as much as possible before installation because there is no access to the bolt head when tightening the top nut to keep the bolt from turning, preventing tightening the nut.



by:

First off the product was beat up with paint/power coating missing in several places on both. I was putting on a brand new truck with less than 800 miles on it so I elected to touch up before install. I’ve hear a lot about Timbren but never had them. I had airbags on my F350 but when I switched to a new Tundra I went with Timbrens. I’m a bit disappointed in the ride. Feels like I can feel a “bump” in the truck from the rubber pick hitting the axle when I go on a bumpy road. Thinking I should have went with airbags. As far as having a load on the truck and helping with the squat, they do as they are advertised.



by:

They do exactly what I wanted them to do. They support my boat trailer and when not towing, they don’t touch the bumpers everything’s great.



by:

These work great for giving you a solid towing experience when loaded heavy; however, when driving empty you definitely get the jounce bumper “into the air” experience when driving on moderate to rough roads. I have the recommended gap installed between the axle and the timbrens, but with terrible midwest roads and highways it doesn’t seem to be enough gap. Smooth roads it rides great. It’s driving 80mph on the expressway and hitting potholes or large cracks where these will hit causing uncomfortable harsh ride.

I’ve resorted to installing and then subsequently removing these anytime I use my travel trailer for longer trips (30minute removal time). I tow a 7000lb loaded travel trailer with an f150 and just needed something to make the soft half ton suspension from porpoising too much on bad-roads. Mission accomplished when towing as I said these things work great for heavy loads. It almost rides better with heavy loads…. I was going to give airbags a try but the reviews from others have scared me from those because even with airbags at the lowest setting you still get the jouncing on bumpy roads.



by:

Easy install took about 20 minutes on my 2017 Ram 3500 SRW. Had about 1/2 inch clearance as recommended. Loaded up my 5th wheel (2350 hitch weight) and about 200 lbs of gear in the bed. Just got back from a 800 mile camping trip through mountains of TN. You can really feel the difference around those sharp corners and uneven surfaces. The truck felt firm and controlled not hard and jarring as some have mentioned. Going over those overpasses with the wonderfully smooth (Not) joists was greatly improved. The truck would squat and rebound again, with a firm controlled response. Driving without a load felt the same as before without them. I would highly recommend these! Ordering from etrailer continues to be my go to option!



by:

So just got them installed today 3/27/24 haven't hooked up the 5th wheel yet but will be this weekend so we'll find out if they are good as everyone claims they are fingers crossed. Install was crazy simple took about 30min(had to find a wrench) have about 1/2in gap between the axle, really excited to test them. Will update the review after this weekend.



by:

Installed these Timbrens on my 2016 F350 to enhance the stability of my truck for a slide in truck camper. Have loved the results of them. They have noticeably helped leveling the truck/camper combo, and sway while driving. When the camper is off the truck these are not engaged. Have had no issues and would recommend them.



by:

The Timbren rear bump stops for 2020 Suburban were great quality and fit perfectly in the replacement of the original ones with no problems. The old ones pulled right out by hand with no hassle. When I installed the new ones I put 2x4 blocks that I cut underneath the bump stops. Then hooked up the 6,400 lbs travel trailer with about 750 lbs of tongue weight on it and they pressed right into place. The Suburban was more stable because it had less swaying while towing. I also gained about 1 inche more in the fender gap which means less rearend saging.


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See what our Experts say about this Timbren Vehicle Suspension

  • SumoSprings or Timbren Helper Springs for a 2008 Chevy Silverado 3500 4x4 Dually
    The SumoSPrings springs for your 2008 Chevy Silverado 3500 4x4 dually, # SSR-211-54, have a lower capacity than similar products; they top out at 2,800 pounds. Based on this I recommend going with the Timbren springs # TGMRCK35S which are rated for 8,600 pounds and will definitely prevent bottoming out when towing or carrying cargo in the bed.
    view full answer...
  • How to Increase Towing Performance with a 2006 GMC Sierra 3500
    In order to determine the maximum gross trailer weight (GTW) that you can haul with your 2006 GMC Sierra 3500, you will need to find both the gross combined weight rating (GCWR) and the gross vehicle weight (GVW). If you subtract the GVW from the GCWR that will give you the maximum GTW you can safely tow. These figures can be found on the white tag inside your driver's door jamb. Unfortunately, the towing capacity of your truck will not change even with the addition of performance enhancements....
    view full answer...
  • Timbren Recommendation for 2008 Chevy Silverado 3500HD Towing Heavy Fifth Wheel
    The Timbren system I would recommend recommend would be the part # TGMRCK35S. It's the lighter duty of the two kits but the heavier duty part # TGMFK25S but it's going to provide a very stiff ride. The # TGMRTT35S still provides the 8,600 lbs of support which will work great. The HD is really needed only in very extreme situations like tow trucks.
    view full answer...
  • Will Timbren part# TGMRCK25S fit on a 2007 Chevy Silverado Classic 3500
    The difference between the 2007 Chevy Silverado 2500 and the 3500 series trucks is the weight capacity. The 3500 is going to have a higher weight capacity than the 2500. I spoke with the engineer at Timbren and he told me that the TImbren part # TGMRCK25S will fit on your 2007 Chevy Silverado Classic 3500, because the Timbren springs for the 2500 and 3500 models will install the same way on both truck models. These springs were tested up to 6,000 pounds and work well within those guidelines....
    view full answer...
  • Is There A Spacer Kit For Timbren SES To Fit A Lifted 2007 Chevy Silverado 3500
    Yes, the Timbren Rear Suspension Enhancement System # TGMRCK35S can still be used on your 2007 Chevy Silverado even though its been lifted. You'll just need to install a spacer to get the gap between the Timbren and the axle around 1" to 1-1/2" to prevent a rough unloaded ride quality. The Spacer Kit for Timbren Suspension Enhancement System # T68MR can be used to eat up some of the space from the lift.
    view full answer...
  • Correct Timbren Kit Fit for a 2006 Chevy Silverado 3500
    The only Timbren kit that fits the 1500, 2500, and 3500 models of the 2006 Chevy Silverado pickups is the Kit # TGMRTT35S for severe service vehicles. Aside from that all of the other kits are model specific. For your 3500 you'll need the kit # TUR350 rated for 6,000 lbs or the kit # TGMRCK35S rated for 8,600 lbs. I recommend the 6K version if you tow or haul occasionally, but you'll want the 8.6K version if you're towing or hauling on a regular basis. Attached are some review videos...
    view full answer...
  • Suspension Enhancement Recommendations for 2010 Chevy Silverado Towing 5th Wheel Trailer
    Both the air springs and the Timbren systems would be compatible with an installed fifth wheel hitch, I've confirmed this for you with Timbren and Firestone. The Timbren system will not have any effect at all on your ride until there's a load placed on your rear suspension. As more weight is added, the springs will get progressively more stiff. This is a passive, non adjustable system. The Firestone Ride Rite # F2250 system would allow you to fine tune your suspension as you wish. An...
    view full answer...
  • How to Pick Out a Timbren Suspension Enhancement for a 2009 Chevy Silverado 3500
    We have two Timbren fits for your 2009 Chevy Silverado 3500. We have the part # TGMRCK35S which is rated for 8,600 lbs of suspension support and the part # TGMRTT35S which will provide 12,000 lbs of suspension support. Most likely the lighter duty setup would be the ideal system since the heavier duty version is for severe service vehicles like tow trucks that would be at or near capacity most of the time they are being used. You should note that these systems do not allow you to exceed...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Andrew K
Video by:
Andrew K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Randy B
Test Fit:
Randy B
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 Bethann B
Updated by:
Bethann B
Employee Robert C
Installed by:
Robert C

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