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2015 Ram ProMaster 3500
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SuperSprings Intl

SumoSprings Solo Custom Helper Springs - Rear Axle

Part Number: SS52GR
2544 Reviews | 23 Questions
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$496.99
Retail:$596.38
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2015 Ram ProMaster 3500

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1,500-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation. Great Prices for the best vehicle suspension from SuperSprings Intl. SumoSprings Solo Custom Helper Springs - Rear Axle part number SS52GR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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SuperSprings Intl Vehicle Suspension - SS52GR

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 1,500-lb Load Support: Levels your ride and prevents sag for steadier towing and hauling.
  • No Upkeep Needed: Closed-cell urethane design needs no air pressure checks or tubing.
  • Smoother, Safer Handling: Progressive springs cushion bumps and cut sway under heavy load.
  • Balanced Ride on Turns: Each spring works separately to reduce body roll and off-center lean.
  • Tough, Weather-Resistant Build: Withstands -25 F to 200 F, oils, salts, and UV for lasting support.
Made in USA

Features to know about

Keep Your Truck Level and Confident: 1,500-lb Rear Suspension Support

Heavy trailers, campers, or loads can cause rear sag that throws off steering and braking. These SumoSprings Solo helper springs add up to 1,500 lbs of rear suspension support at 50-percent compression to keep your ride level when towing or hauling. They help your factory suspension handle the extra weight so steering stays controlled, traction stays consistent, and your headlights stay aimed where they should.

Side-by-side comparison showing SumoSprings Solo Custom Helper Springs installed on a truck’s rear axle, with one spring uncompressed and the other compressed under load, illustrating progressive suspension support.

Smooth Out Bumps and Shocks: Progressive Load Control

Every bump and load change feels different, and these microcellular urethane springs know how to handle both. Their progressive load control lets them compress easily for lighter loads to keep the ride smooth, then stiffen up as weight increases to add real support. The springs absorb bumps and dampen road vibration so the ride stays comfortable whether you’re running full or empty.

Stay Stable Through Turns and Off-Center Loads: Independent Spring Action

When a curve or uneven load tries to throw you off balance, these springs work independently to keep each side planted. They help reduce body roll when cornering and compensate for uneven weight in the bed or trailer so your truck feels stable in crosswinds, on ramps, or pulling into uneven driveways.

Skip the Maintenance Hassle: No-Drill, No-Air Setup

You don’t need air lines, compressors, or pressure gauges to keep these springs working. The closed-cell urethane design needs no air pressure or upkeep and installs easily with no drilling required. Once in place, they quietly do their job—supporting your load without any adjustments or maintenance.

Built Tough for Real Work Conditions: Durable Urethane Construction

These high-density microcellular urethane springs hold up through harsh conditions and heavy use. They resist abrasion, oils, road salts, and UV rays while performing in temperatures from -25 F to 200 F. Because they compress vertically with minimal side expansion, they fit tight spaces without interference and keep doing their job season after season.

Specs

Weight and Capacity

  • Weight capacity (at 50-percent compression): 1,500 lbs

Warranty

  • Limited lifetime warranty
  • 30-Day satisfaction guarantee

SSR-142-47 SuperSprings Sumo Springs Solo Rear Vehicle Suspension Kit for Trucks

Installation Details SS52GR Installation instructions

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Customer Satisfaction Score:

Ratings & Reviews

4.7

2544 reviews
5 Stars
(2057)
4 Stars
(331)
3 Stars
(54)
2 Stars
(38)
1 Star
(64)
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by:
2013 Ford F-150 Raptor
2013 Ford SVT Raptor
Aftermarket Deaver +1 Leafs
Aftermarket SDHQ Bump Stop Pads

Install was a breeze, 25 minutes, 2 wrenches and a socket.

Used the 1” Spacer for additional preload.
Gives me about 1 1/4” of open travel(bounce) before the Sumos make contact. Loaded up my RTT and camping gear along with the fam and the Sumos kicked in. Feels like I have a Sumo Wrestler on each corner of the frame in the rear supporting my load. I was looking for assistance in the rear to reduce the squat. Tried Firestone Air Bags, didn’t work out. Bought into RoadActive Suspension, doesn’t work with aftermarket leafs. Sumo was a desired choice but I felt iffy about the concept.

Happy with the outcome. I’m sure the truck is happy as well.
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by:
2018 Ford F-150
I have a 2018 Ford F150 RAPTOR. Although the towing capacity for the Raptor is 8200 lbs, personally I won't take it much past 6000 lbs in order to be safe and be easier on the engine. I've included a picture of my Raptor with my 5800 lbs Coachman 23LT ADRENALINE toy hauler trailer with a BLUE OX SYSTEM weight distribution hitch. With the SumoSprings Solo Custom Helper Springs - Rear Axle - as you can see in the picture - I get no squat whatsoever -- in fact, I'm still sitting up with a slight downward rake while towing. When I hit potholes or bumps, I really don't feel the SumoSprings compressing and keeping the suspension stiffer. Actually, I don't feel the SumoSprings at all. I have very little sway, except when I'm doing 65 mph and an eighteen wheeler passes me, I get an ever so slight pull toward the big rig from the low pressure it creates as it pushes air out of its path, but I simply add a little bit of steering opposite the eighteen wheeler and it immediately straightens up and stays straight. Overall, I am impressed with SumoSprings and I would never ever tow anything again without them, because it stops the sag. (About 20 yrs ago, I used to get oncoming bright lights constantly flashed at me in the old days because my trailer caused my truck to sag and the front end lift, and people thought I had my bright lights on all the time).
2018 R. profile picture

2018 R.

6/1/2025

STOP THE SAG !!! After 1 year, my review is the same: Im loading about 6000 lbs onto a 2018 Ford Raptor 8200 lbs towing capacity with the BLUE OX SYSTEM weight distribution hitch. The SumoSprings Solo Custom Helper Springs - Rear Axle Part Number: SS52GR continue to be worry-free after one year. No sag when towing, I have never felt a harsh ride over bumps and potholes, and I dont even feel them at all when Im not towing. They should have just been factory equipped from Ford.

Jesse M. profile picture
Etrailer Expert

Jesse M.

6/2/2025

@2018R Awesome! Glad to hear your SumoSprings are working so well for you. Nobody likes a saggy rear anyways haha
by:
2018 Ford F-150 Raptor
Install was easy , haven’t towed with them yet
by:
2019 Ford F-150 Raptor
These were shipped to me mid-trip so I had a good chance to do a before and after with same loads/ same roads for 3100 miles. They were easy to install (in my daughters driveway) in about an hour with one reluctant bolt in the original bump stop. I did not install the hard spacer, I figured I’d add it later if needed. I was able to do the install w/o jacking up the whole truck using a 1 1/2 ton jack under the hitch receiver w/ a jackstand next to it. I needed just a few inches as there’s lots of room under the stock height truck (I was lying on a piece of cardboard). The helper springs didn’t quite touch the axle when the jack was removed. When I first drove it in town with the Sumo’s on it they were not really noticeable. When loaded up with my 22’ Livin’ Lite Axxess trailer (4300lbs with 650lb hitch weight) the rear end would squish into the overload springs a good 3/4” but the truck was about level w/o rear end sag.
Driving home over many of the same roads I noticed it was better over railroad crossings and rhythmic bumps on the highway that previously pitched it fore and aft. The trucks manners were much better overall during big hits (like hitting a curb- yup) and pulling off-highway. The trailer is low so it doesn’t go very far off road so I can’t report on that.
Overall for ease of ordering, of install, simple usage w/o need of airlines and effective control of the rearend of the truck and the trailer I feel they deserve the 5 stars.
Greg profile picture

Greg

6/2/2024

Still happy overall with the performance. I have noticed that they do affect the truck more when it is unloaded not towing than I previously thought, on a medium size bump in the street you will feel it hit the sumo’s for example. Since I’m still not doing any hi-speed off roading I’m not very worried about it. But overall I am still happy with my purchase.

by:
The SumoSprings have worked great! I have loaded down my Ford Raptor truck many times now. This includes towing a horse trailer, loaded hay trailer, and pontoon boat. All times the Sumosprings prevented my truck from "squatting" too much. I am glad I purchased them!
by:
2018 Ford F-150 Raptor
Ordered these for my 2018 Ford Raptor which is mainly used as an everyday and long road trip vehicle. First test run I installed the spacers that came with it. Was a bit bumpy without a load on it. Took a whole 5 mins to take the spacers off and so far she feels normal without the load. Keeping the spacers under the seat incase I need to haul a real heavy load again. Overall really great product, durable, easy assembly and no need for hassling with airbags. Definitely was worth it! I have peace of mind now that my shocks won't wear out or bottom out when hauling a load.
by:
Worked great. Exactly what I was looking for.
Brooke M. profile picture
Etrailer Expert

Brooke M.

3/26/2025

Yay! It's a load off my shoulders knowing these are working well for you ;)

by:
2020 Ford F-150 Raptor
Work great still a good ride . Pull a 32 ft 5th wheel behind a Ford Raptor no sag or sway .
by:
Tony profile picture

Tony

9/10/2023

It has worked out well, my 2019 Raptor no longer sags pulling my travel trailer

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2013 Jeep Wrangler Unlimited
I put these on a 2013 Jeep JK (not lifted) that tows a 3000 lb trailer in rough terrain; Total game changer.

These replaced the anemic factory stops (which had completely disintegrated) and make it impossible to 'bottom out' on the dips and holes that use to beat up the suspension. I got nearly all of my vertical travel back and the vehicle now sits almost level under high tongue load.

They go on pretty easy. I suggest sliding in one side, and then using a wooden dowel and hammer to pop the other side in the stock receiver cup.

Highly recommended. These are a MUST if you are towing a trailer (with a medium sized SUV) of any significant weight or if you just want to be able to bounce hard without bottoming out your suspension. I am likely going to get the front suspension version now as well.
Wish I knew these existed sooner.
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Heather A. profile picture
Etrailer Expert

Heather A.

8/12/2026

Wow thank you for the glowing review Randall. It sounds like once you got them installed they are working out great. That sunset is gorgeous, where were you in this photo?

Randall profile picture

Randall

8/12/2026

@HeatherA This photo was taken in South West Colorado @ about 10,000 ft.
by:
2025 Promaster 2500 159” wheelbase. Backed the van on couple 2” X 6 “ easier sliding under. Sprayed PB Blaster on top of bumper spring, using a 16” Channel Lock, easy off with the old. At that time I jacked the rear end to allow clearance. One side at a time. Took longer for set up then the job. I used the long bolt with two spacers. Have not drove yet, though looking for great results.
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Lazer S. profile picture
Etrailer Expert

Lazer S.

5/13/2026

Glad to hear the install wasn't too bad, Michael! Definitely let us know how the ride is once you take it out for a drive! What are you using your Van for? The tires look pretty beefy.

by:
2020 Jeep Gladiator
This only pertains to the order, shipping speed, and install as I have not put a heavy load on these sumo Springs yet but I feel like that's a foregone conclusion based off the reviews already. The ordering process, the shipping, and the installation was unbelievably easy. I kept rereading the instructions thinking this can't be right because it was so simple. I looked at the YouTube video and realized it is that simple! So happy with the ordering process, the quality of the initial product I opened, and how simple it was to put on the jeep.
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Claire H. profile picture
Etrailer Expert

Claire H.

9/1/2026

That is the beauty of SumoSprings! Super easy to install and once they're on you can forget they're there! Are you planning on towing something with your Jeep that you want extra support for?

Justin profile picture

Justin

9/1/2026

@ClaireH yes Ms Claire. I plan to put a truck camper on the Jeep (that weighs in the 500-1000 lbs range). My payload is 1700 lbs so I know a camper of the weight will be significant my truck. Already ordered a stiffer rear anti-sway bar as well.
Claire H. profile picture
Etrailer Expert

Claire H.

9/2/2026

@Justin That sounds like a good plan! These SumoSprings plus the sway bar should be more than enough to handle the weight of your truck bed camper.
by:
2022 Ford F-150
Love them! The truck barely even squatted, had two dirt bikes, and a generator in the bed as well! It handles the bumps and sway great
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Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

5/20/2026

Looks like you were about to head off somewhere fun, Chad!

by:
Product is great, exceeded my expectations. Install is simple and straightforward. It’s a night and day difference in both the body roll and the handling small bumps all the way up to off-road conditions.
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Christopher H. profile picture
Etrailer Expert

Christopher H.

8/4/2026

Happy to hear the # SSR-118-54 was a simple install and is working well for you. This is a great system!

by:
Put these on a Jeep Gladiator to haul a motorcycle to Sturgis. Kept everything level, good ride and stability. Highly recommend.
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by:
2016 Toyota Tundra
It arrived pretty promptly about 30 minutes later I had him installed. It took me longer to find the proper Tools. Never had to remove the tires or wheels the only time I had to jack it up was to put the helper springs and screw them down very easily install
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by:
2000 Nissan Leaf
Great product! Bought these for my 2000 7.3 f250. Didn't want something that is constantly active like ras or hellwig since my leaf springs are new and rated for 4k pounds. Installed these in 1 hr super simple only hard part was the factory bump stop on driver side was a pain. Didn't install the puck they give due to height of truck and I knew more or less at what point I wanted them engaging. I haul cattle to shows/ auctions or between pastures with my 24ft big bend and these things actually provided a smoother ride in my truck loaded then unloaded.they do a great job with the added support and are better than an overload spring with handling sway and providing a smooth ride loaded. Just wish I could use the 3k pound rated ones on this truck and my dually but doesn't fit if you have a gooseneck sadly so will probably have to go with timbs on the drw. Over all great product can't speak to longevity but solid for the time being. And customer service with this company is excellent if you have a question or problem they're on top of it...hope they pay them as well as the reputation they're building for them.
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by:
Very easy installation. The improvement in handling is phenomenal.
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Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

4/23/2026

Thanks for the awesome feedback, Jeff! Love hearing that the install was a breeze and that you noticed such a big difference in handling, that’s exactly what you want after the upgrade. Really appreciate you sharing the photos too, it’s always fun to see the comparison.

by:
2024 Chevrolet Silverado 1500
I put a set of 47s on my Silverado 1500 and towed my dump trailer that weighed 6000 pounds the way I had it loaded for 50 miles on all kinds of roads and it worked well. I didn’t use the spacers and the truck still rides like it did before the install.
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Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

1/8/2026

Glad the Sumos are helping make your loads easier to tow!

by:
Jeep Gladiator Mojave - swapped out the rear stock bump stops with these. High quality parts. Just jack up the truck enough to give you room to work with and put in your jack stands, no need to remove the wheels. I look forward to seeing how they do with towing! Hopefully I can update my review here afterwards. Check out the gap difference in the pictures. Should touch sooner during normal drive conditions and hopefully help reduce some trailer squat and help towing to be smoother.
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by:
Opted for the Blue 1000lb Sumo's w/spacer over the 1500lb Black ones. 1500 Silverado Max Tow & reduces squatting by 2" on a 1000lb+ tongue weight. Ride is still good, but you can feel the Sumo's engage over large dips or bumps which is not an issue for me.
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Richard profile picture

Richard

2/12/2026

No issues. Towed a 27 Airstream around 4k miles &amp its all good.

Lazer S. profile picture
Etrailer Expert

Lazer S.

2/12/2026

@Richard Nice! Glad you are still happy with them! Was that all one trip, or multiple different trips?
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    Yes, the Roadactive Suspension Kit part # RAS3611 will fit your 2020 Ford F-150 Raptor with the SumoSprings # SS52GR.
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  • Best Rear Suspension Upgrade for the 2020 Ford Raptor
    I really like the SumoSprings Solo Custom Helper Springs - Rear Axle part # SS52GR for this situation. They engage much more smoothly than the Timbrens part # TFR150RB do. The overall user experience is going to be better for you since you won't feel them engage which is common on the Timbrens. The 1500 lb. capacity is at 50% compression so at about mid stroke the more they get compressed the more weight they take up. Please keep in mind this doesn't raise your vehicles towing capabilities...
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  • Suspension Enhancement Recommendation for 2020 Ford F150 Raptor Towing Trailer
    The rear suspension enhancement I recommend for your 2020 Ford F-150 Raptor is the SumoSprings Solo kit part # SS52GR. This easy to install and maintenance-free kit will give you the support you need for the rear suspension to eliminate the sag but unlike other similar kits (Timbren) it won't make the ride quality really harsh when unloaded. Also it doesn't require running air lines or maintaining air pressure like air bag kits do.
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  • Will SumoSprings For 2019 Ford F-150 Raptor Rest on Frame Squarely When Loaded
    The SumoSpring part # SS552GR that fits your 2019 Ford F-150 Raptor attaches to a bracket that attaches to your truck frame so it does not miss contact with the frame at all. The load would be evenly distributed on it.
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  • Which SumoSprings Kit Fits 2017 Ford F-150 Raptor
    The SumoSprings kit part # SS52GR is the correct kit that fits your 2017 Ford F-150 Raptor.
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Info for this part was:

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