Which Timbren Rear Axle Jounce Springs Will Fit The 2026 F350 Dually Super Duty?

Updated 10/07/2026 | Published 10/05/2026

Products Featured in This Question

Timbren Suspension Enhancement System - Rear Axle

(7275)

$398.07

Timbren Suspension Enhancement System - Severe Service - Rear Axle

(962)

$398.07

Question:

Message: I am interested in purchasing a set of Timbren Rear Suspension SES for my 2026 Ford F-350 Super Duty Dually, but I am uncertain which specific part number is compatible with my vehicle. Could you please recommend the best option for my trucks setup? Any guidance you can provide to ensure I the correct product would be greatly appreciated. Thank you for your assistance. Alexis Albino

asked by: Alexis A

Expert Reply:

Hey Alexis!

There are two Timbren kits that work with your 2026 Ford F350 Super Duty, and both fit the dually and single wheel models, so no issues there.

-Timbren Suspension Enhancement System - Rear Axle # TFR350SDJ
-Timbren Suspension Enhancement System - Severe Service - Rear Axle # TFRTT350J

The only difference between these is that the second one is the severe service model, which is a lot stiffer and rated for more weight. The tradeoff is that it will give the unloaded truck a stiffer ride, so I'd only go with the severe kit if you have something heavy in the truck bed all the time like a truck bed camper, or plan to tow a heavy trailer almost 100% of the time you drive the truck.

I personally had the standard kit on my old Nissan Titan and it stopped most of the squat any time I pulled my car hauler. It took me about 30 minutes to install on my truck since no drilling or modification is needed for these kits.
What do you plan to haul behind it?

expert reply by: Andrew N

Alexis A.

10/6/2026

Thank you for the recommendation, Andrew. To answer your question, we primarily use the truck to haul a 14,000 lb. fifth wheel. We are not full-time towers; we typically haul the trailer once or twice a month. Given that usage, would you recommend the standard kit or the severe service kit for our setup?

Andrew N.

10/6/2026

@AlexisA You're welcome. I would say go with the standard kit. That way it will help with the squat, but you won't have too harsh of a ride when you're not towing. Sort of the best of both worlds.

Alexis A.

10/6/2026

@AndrewN Thank you, Andrew. That makes perfect sense. I will go ahead and order the standard Timbren kit (# TFR350SDJ). I really appreciate the expert guidance and the help in narrowing down the right choice for my setup!

Randy

10/7/2026

I added those same ones to my 2025 F350 dually. I did have to consult with E-trailer and then they got me in contact with Timbren Direct because they hadn’t sent the proper spacers for the new 25 dually. They changed them in 23 and took away the spring perch that the Timbren used to go down and rest on when fully loaded. Now it goes down and sits on top of the axle housing itself. You want to make sure you have about an inch to an inch and a half clearance unloaded between the top of the axle tube and the Timbren. if it’s more than that, then you need to get a hold of them and have them send you spacers of the width that you need to get to that. Timbren was not aware of the change they made where the rubber spring actually made contact on the 25 and newer ones. You will like them because they do make a difference. We haul a 22,000-pound Brinkley, and it has a lot of pin weight, and those really help