What Rear Suspension Support Should I Get for My 1992 Ford E-350 7.5L Chassis Motorhome?

Question

Question:

Hi, I was wondering if there are rear sumo springs for a 1992 Ford E-350 7.5L chassis motorhome, class C. I’m not having any luck finding them. I’d prefer that over air helper springs since I have sumo springs on the front axle. Thank you!

asked by: Jake K

0

Expert Reply:

Hello Jake,

Thanks for writing in.

I double checked with SuperSprings, and there are not any SumoSprings available for the 1992 Ford E-350. I see that you already ordered exactly what I was going to recommend, the SuperSprings Custom Suspension Stabilizer and Sway Control Kit # SSA8.

The # SSA8 is a great option for your E-350. It installs above your existing rear leaf springs and gives you 1,500 lbs of additional load-leveling support to help reduce rear-end sag and sway. It is also self-adjusting, so there are no air lines or pressure to maintain. Just keep in mind that suspension enhancement does not increase your E-350's GVWR or overall weight-carrying capacity.

Installation is bolt-on with no drilling required. The SuperSprings sit over the factory leaf springs, and the adjustable shackle positions allow you to dial in the amount of preload depending on how much support you need.

Getting things geared up for the next adventure? Where are you headed to next?

expert reply by: Kate F

0

SuperSpring Install
(click to enlarge)

Jake K.

9/17/2026

Hi Kate, Thanks for your response. #SSA8 did help with sway control, but being that RV is heavy, it'll still bottom out when I hit larger potholes or rough surface. I love the Sierras in Eastern California and that's what I frequent with my RV! Jake

Kate F.

9/18/2026

@JakeK I really wish there were some SumoSprings available because they do give you a softer ride. Since you are bottoming out, I think it would be worth considering the Timbren Rear Suspension Enhancement System # TFER35092B. The main downside I hear with Timbrens is that they can make the ride a little harsher when the vehicle is unloaded, although there are plenty of people who say they don't notice much of a difference. Since you are always loaded, I think your ride quality will be just fine while giving you that extra support you need. Felt like I am not doing my job properly, if I did not make you aware of this option as well =)

Jake

9/19/2026

@KateF Thanks for the suggestion. I did look into it, but it may not be long enough to offer the support the vehicle needs. There’s a ~7 inch gap between the rear axle and the chassis frame that the timbrens would bolt into. Thank you! Jake

Kate F.

9/21/2026

@Jake I completely understand your concern with that 7" gap. The good news is the Timbren # TFER35092B is 6" tall and 3-7/8" wide, including the brackets that bolt to the frame, so the rubber spring itself does not need to span that entire 7". Once installed, Timbren calls for 1/2" to 1-1/2" of clearance between the spring and the contact point with the vehicle unloaded. With the measurements you provided, you will be right in that range. I don't think that a spacer is necessary, but after you install if you decide you want less of a gap, we can find you the appropriate spacer. Since your main concern is bottoming out on rough roads, I still think the Timbrens are a great option for what you are trying to accomplish.

See All (5) Replies to Jake K. ∨

Answer 1

Hey Tom, thanks for reaching out. Yes, we do have an air bag kit for your 1991 Ford E350 Econoline Class C motorhome. Here is what I recommend: - Air Lift LoadLifter 5000 Ultimate Air Helper Springs with Internal Jounce Bumpers - Rear Axle #AL88138 I…

view full answer...

Answer 2

The Timbren system #TFER35092B would work to reduce sag in the suspension, as would the air bags. However, there are a few differences in how the Timbren systems work as compared to the air bag helper springs. The Timbren systems don't require…

view full answer...

Answer 3

Adding in some lighter capacity enhancements can help cushion the ride as well as reduce sag and swaying. For your E-350 chassis you'll need the Timbren Front Suspension Enhancement System #TFEF350 and Timbren Rear Suspension Enhancement System…

view full answer...

Answer 4

To help level out your new RV that's built on the Ford E-350 chassis I recommend taking a look at the Timbren Rear Suspension Enhancement System #TFER35092B. These heavy-duty jounce-style springs will replace the factory bump stops on the rear…

view full answer...

Answer 5

We were able to get height and width you were looking for of the Timbrens that fit your 2006 Ford E-350, the Rear Suspension Enhancement System #TFER35092B. Including the bracket, the Timbren system is 6 inches tall and 3-7/8 inches wide.

view full answer...

Answer 6

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

view full answer...

Answer 7

Hey Doug! The Firestone Ride-Rite Air Helper Springs #F35FV are the right kit for your 2026 Ford F-350 FX4 dually. However, you will need to measure to be sure it fits. The distance from the top of your rear axle to the top of the jounce bump stop…

view full answer...

Answer 8

Yes, it will work. You'll just need to cut the Lance 6-pin connector out and rewire it into the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item #e99011. Here are the individual functions of that Lance 6-pin:…

view full answer...

Answer 9

Hello Jake, Thanks for writing in. I double checked with SuperSprings, and there are not any SumoSprings available for the 1992 Ford E-350. I see that you already ordered exactly what I was going to recommend, the SuperSprings Custom Suspension…

view full answer...

What Rear Suspension Support Should I Get for My 1992 Ford E-350 7.5L Chassis Motorhome?

Products Featured in This Question

Product Page this Question was Asked From

Featured Help Information

Instructions

Miscellaneous Media

Continue Researching