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  1. Vehicle Suspension
  2. SuperSprings Intl
  3. Bump Stops
  4. Towing/Load Leveling
  5. Front Axle Suspension Enhancement
  6. Light Duty
THIS ITEM IS NOT A FIT FOR
2015 Jeep Wrangler
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SuperSprings Intl

SumoSprings Solo Custom Helper Springs - Front Axle

Part Number: SSF-103-40
In Stock
$238.99
Vehicle Suspension
Not Confirmed to Fit

2015 Jeep Wrangler

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1,000-lb Capacity. Upgrade your vehicle's front 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 - Front Axle part number SSF-103-40 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (774)
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SuperSprings Intl Vehicle Suspension - SSF-103-40

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 1,000-lb Front Support: Levels your ride when carrying heavy gear like a plow or winch.
  • No Upkeep Needed: Solid urethane springs work with no air lines or pressure checks.
  • Smoother, Steadier Drive: Cushions bumps and keeps steering and braking more consistent.
  • Progressive Load Control: Compresses softly for light loads, firms up to 80% for heavy ones.
  • Easy, No-Drill Install: Mounts directly with included brackets using basic hand tools.
Made in USA

Features to know about

Stay Level and in Control: Up to 1,000 lbs of Front-End Support

When extra weight on the front end makes the ride dip or steering feel light, these SumoSprings helper springs take up the slack. With up to 1,000 lbs of support at 50-percent compression, they level your stance and help keep steering and braking consistent. The microcellular urethane absorbs bumps and shocks so the ride stays controlled even when carrying a heavy front load.

Smooth Ride Over Every Bump: Progressive Load Control

These springs adapt automatically to what you’re carrying. With lighter loads, they compress easily for a softer, more comfortable ride. As the load increases, they stiffen progressively—up to 80 percent compression—to give firm support when it’s needed most. That means steady handling without harshness whether you’re loaded down or running light.

Comparison image showing SumoSprings Solo Custom Helper Springs installed on a vehicle’s front axle, with one spring uncompressed and one compressed to illustrate load support and suspension leveling performance.

Stay Steady in Crosswinds and Turns: Independent Spring Action

Each spring works on its own to keep that side of the vehicle planted. This independent action helps reduce body roll in curves and keeps things balanced when loads aren’t perfectly centered. You’ll feel more stable on winding roads or when a gust hits you on the highway.

Built Tough and Maintenance-Free: Microcellular Urethane Construction

These helper springs are made from durable microcellular urethane that resists oil, salt, and UV rays. They perform reliably from -25°F to 200°F and compress vertically with minimal side expansion so nearby parts stay safe. There’s no air pressure to check or lines to run—just simple, no-drill installation and long-term dependability once they’re in place.

Specs

Weight and Capacity

  • Weight capacity (at 50-percent compression): 1,000 lbs

Warranty

  • Limited lifetime warranty
  • 30-Day satisfaction guarantee

SSF-103-40 SuperSprings Sumo Springs Solo Front Vehicle Suspension Kit for Trucks

Replaces SSF-103

Installation Details SSF-103-40 Installation instructions

This Product Fits The Following Vehicles




Video of SumoSprings Solo Custom Helper Springs - Front Axle
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for What to Know About the SumoSprings Solo Custom Helper Springs-SSF-103-40

Speaker 1: Today, we're taking a look at the Sumo Springs custom helper springs for the front axle. This product fits a 1999 to 2004 Ford F250 and 350 Super Duty, as well as an F350, 450, and 550 cab & chassis. Now, to ensure that this is a fit for your vehicle, you can always use the vehicle fit guide at etrailer.com. These helper springs are designed to upgrade your vehicle's front suspension offering improved driver control and comfort, so they're really gonna help when it comes to supporting heavier front end loads.That's gonna help keep your vehicle level front to back. It's gonna help absorb bumps and road shocks and it's gonna help minimize that sway. Now, these do feature progressive load control.

What that means is that these springs will compress according to the weight of your cargo, so for lighters loads, the springs compress easily at first for soft engagement and a less bumpy ride. Heavier loads, they compress by as much as 80% from maximum support.The springs do work independently from each other to compensate for off-center loads, which again is gonna help reduce that body roll, especially during sharp turns or during heavy or strong crosswinds. They're made from a durable micro-cellular urethane. They work in temperatures ranging from -25 degrees Fahrenheit all the way to positive 200 degree Fahrenheit, and the strong material's designed to resist damage that's typically caused by oils, road salts, and UV rays.With these, you'll notice minimal later expansion, so that means these springs compress vertically instead of off to the side so they aren't easily damaged when operating in tight spaces. Another neat feature about this system is that it's completely maintenance-free, so there's no tubing to run or air pressure to monitor like when using air springs.

It's a simple no-drill installation. It comes with the mounting plate, comes with your hardware, detailed installation instructions. It uses pre-drilled attachment points on the frame of the vehicle. The springs are included, obviously, and the product's made in the USA.Weight capacity at 50% compression is 1000 pounds. Just always keep in mind that the Sumo springs will not increase your vehicle's weight carrying capacity.

That's gonna do it for today's look at the Sumo Springs custom helper spring kit for the front axle.

Ratings & Reviews

4.7

774 reviews
5 Stars
(644)
4 Stars
(92)
3 Stars
(18)
2 Stars
(7)
1 Star
(13)
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by:
Easy to install, works as advertised.
Jerry profile picture

Jerry

12/19/2025

Wow is an understatement! It is like driving a different pickup. Greatly improve sway issues during windy day drives, much less vehicle lean in curves, and better overall ride with heavy loads. My Ford 350 supper duty is underload 98 of the time. We only use the Pickup when pulling trailer with an 100 gallon diesel pony tank.

Lazer S. profile picture
Etrailer Expert

Lazer S.

12/19/2025

@Jerry Quite the endorsement! Glad you are getting good use out of them and they are working well for you! What kind of trailer are you typically towing?
by:
So far I am extremely happy with them. Definitely makes the ride smoother.
by:
Easy Install, I installed the front & back ones due to a heavy bale bed install & front replacement bumper. The front ones stiffened up the ride quite a bit but all have held up very good so far.
by:
1999 Ford F-250 Super Duty
Put these on the front of my 99 F250 and they make it ride like a new truck!!! Awesome
by:
2002 Ford F-250 and F-350 Super Duty
by:
What most new RV owners don't know is that the chassis that their new mobile home sits on barely has the equipment to support that new home. Adding SumpSprings is going to improve your ride and help support the structure of your home. FYI, use a jack on the leaf springs to help align the holes on the bracket to the ones on the frame.
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.
James D. profile picture
Etrailer Expert

James D.

8/3/2026

Appreciate you leaving a review Austin, It's always nice when a product exceeds expectations and these springs have been highly rated. Are you typically off road or do you plan on towing?

by:
2015 Mercedes-Benz Sprinter
Super easy to install maybe 30 minutes for all 4
Fronts were done from above with wheel turned full right or left and load off that side with jack,rears jack to take off load only used large flat head screw drive to remove replace
improved side to side roll/sway ride is firmer went with the black capacity maybe yellow on rear if loads increase
Lazer S. profile picture
Etrailer Expert

Lazer S.

10/21/2025

30 Minutes for all 4?! That's got to be some kind of record, Dennis! Glad the process was nice and easy and I hope they serve you well. Let us know if you do end up needing to go to the heavier duty yellow option as well, we always like to get real life experiences from people. : ) Any more trips planned for the year?

by:
2018 ford F-250 Super Duty
eTrailer made the choice easy by offering advise on options and applications. Installation was also quite simple, though the directions were a little too simple. However, I was able to determine once installed prior to final torque, that the top plate could be rotated to align the helper springs with the corresponding flat plate on top of the differential/axel perch. Honestly, with daily driving if there is a difference I cannot tell, which is a GOOD thing. My F250 Powerstroke diesel, like most others, unladen has a firm ride. I did not want it to be more so. My 2018 does not fit in my garage not even close. So outside 24/7 since purchase, the OEM bumpstops at all 4 corners needed to be replaced and I wanted to upgrade them. These are quality no-maintenance bumpstops, and did not require any additional spacers to fit properly with my 2-2.5 inch leveling spacers. Paired with the Timbren SES for the rear, my Super Duty is set for all of my needs, including light to medium hauling / towing, for the foreseeable future. A huge shout-out to all of the people I spoke with for both purchases - thank you for all of your advise and assistance!!! eTrailer will most certainly be a first-stop should I need help with anything else I may need from all of their other and quite expansive upgrades for my rig.
by:
I have a Workhorse W22 chassis. I installed steering dampeners and HD sway bar to reduce the "loose" steering. After installing the SumoSprings Front Spring helpers on the front end, 90% of the looseness on the front end disappeared. It is now a pleasure to drive. Very little sway from passing trucks and cross winds. I will be installing a set on the rear this year.
Claire H. profile picture
Etrailer Expert

Claire H.

7/6/2026

That is awesome to hear! It must be such a relief to not have to put so much energy into controlling the wheel while driving now.

by:
2018 Thor Freedom Elite Motorhome
I recently purchased/installed SumoSprings for the front axle on my 2018 Thor Freedom Elite 28FE. Having previously purchased/installed SumoSprings for the rear axle I have to say that the overall improvement in ride/handling has exceeded my expectations. As always, etrailer provided valuable insights and prompt inquiries to my questions. The level of in-depth product knowledge amongst the etrailer staff is second to none. Thanks etrailer!
by:
Ordering and delivery was quick and easy. The SumoSprings really improved the ride of our C Class RV. The only problem was one of the springs had cross threaded threads so I had to tap the treads to make it work. They were delivered in a plain brown box with no manufacture information or instructions. It makes believe the were a returned item, the previous purchaser couldn't get them to work either. I just had the tools and skill to correct the problem.
by:
2006 Dodge Ram Pickup
2006 Dodge Ram 3500 SRW 5.9 Cummins 4x2
Original bump stops were dry rotted and almost not existent. Very easy install. Took about 30 minutes. The Sumo springs are engaged all the time. This may be due to the truck being a 4x2? You can feel the front end is stiffer over bumps and dips of the road, which I feel is ok and not extreme. Towing the 5th wheel I feel the truck handles better than before.
by:
These Sumo springs (as well as the ones I purchased for the rear of my RV) installed easily, fit perfectly and do a great job reducing vibration and improving ride quality. Very pleased.
by:
2017 Mercedes-Benz Sprinter 3500
Installed front Sumosprings yesterday but have not driven vehicle yet. The front have full contact with the A-frames.
Should help with van side-to-side sway
.
Shopping around for a set to install on the rear as well.
by:
2022 Winnebago Navion Motorhome
I’ve made several purchases from eTrailer and have been satisfied every time! Recently bought front and rear Sumo helper springs. Installation was a breeze. They have helped reduce the side to side sway caused by wind, freeway traffic and rough roads. So far im very happy with them.
by:
2019 Chevrolet Express Van
Installed Sumo Springs on my 2019 Chevy 4500 motorhome, I was looking for ride improvement without breaking the bank. These days so many products are marketed well but never match the performance that was promised. That is not the case with Sumo Springs!!! I am very pleased with the ride improvement, sway is gone when transitioning from different levels of pavement and the shock of bumps is 50% better!! Installed myself on front and back in about 1 hour, front ended up about 3/8” higher after a couple days, got front end alignment done but didn’t need any adjustment. Finished a 400 mile road day today and my wife and I are very pleased. Excellent product!!
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

4/2/2026

That's awesome to hear, Edwin! Where did you head off to?

by:
these look like the perfect thing for my tired old helper springs, I put SumoSprings on my rear axel of my Jeep a year ago and the have made that ride much better hoping for the same with these.
by:
Mercedes-Benz Sprinter
Sumo springs greatly reduced body sway on my 2021 Mercedes Sprinter.
by:
2009 Winnebago Adventurer Motorhome
Have not had a chance to install yet but seem to be a lot better than what was on my RV. One thing I have noticed is the old part screws into a nut welded on the frame and the new SumoSpings bolt is to small to use the welded nut. So installation would be a lot easier if you could just screw it in.
by:
Sumo Springs really helped with the bumps in the front of the 2019 Ford E350 Winnebago! Very happy with them. Super easy install even though a bit awkward to reach the spot.
by:
Very easy installation. Would be nice if they were about 2” longer to get contact sooner but they were a good replacement for the hollow stock bump stops.
by:
Springs arrived on time without any damage. Installation was completed in about a half hour with a 10mm socket, 3” extension and ratchet to remove the stock bump block on our Ford E450. Then just thread the Sumo Spring in place of the removed block. This was the easiest upgrade I’ve done so far.
by:
Put these on a Sprinter and what a positive difference they made. One can still feel the poor shape of our roads but no more jarring as was the case before. Definitely worth it.
by:
toyota Tacoma
Springs are good, working well. My Tacoma is stock (no lift). With the front end jacked up and wheel/tires totally suspended I was not able to get the springs mounted. I had to cut off about 1/4 inch of threads to get them into position to screw then in. Once that was done everything was ok.
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See what our Experts say about this SuperSprings Intl Vehicle Suspension

  • Recommended SumoSprings For the Front Axle on a 1999 Ford F-250
    I had the SumoSprings Solo Custom Helper Spring # SSF-103-40 measured and it will be 5-1/2 inches tall from the bottom of the spring to the top of the bracket. The blue # SSF-103-40 will also measure the same as the black # SSF-103-47. Deciding between the two will depend on how much support you need. Between the two, however, I would go with the blue # SSF-103-40. This will affect the ride less than the more heavy duty black version. If you are carrying a lot of weight and need the extra...
    view full answer...

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