Need New Leaf Springs For 2021 Grand Design Momentum 397

Updated 09/09/2025 | Published 06/10/2025

Products Featured in This Question

7-Leaf Double-Eye Spring for 8,000-lb Trailer Axles - 24-7/8" Long

(138)

$94.88

U-Bolt Kit for Mounting 8,000-lb, Round Trailer Axles - 8" Long U-Bolts

(541)

$90.49

7-Leaf Double-Eye Spring for 8,000-lb Trailer Axles - 24-7/8" - Black

(2331)

$73.80

Question:

I have a triple axle 2021 Momentum 397thfifth wheel RV. I have Dexter 4000 springs on it now. I need to replace 1 spring, but will change both on that axle. Any reason to not use a pair of these springs instead of a pair of Dexter springs?

asked by: Steve

Expert Reply:

Hello Steve, thanks for reaching out. In my honest opinion, leaf springs are leaf springs. There is not going to be a noticeable difference in quality or longevity between the different brands. As long as the length of the spring is correct and the weight rating is correct, you will be just fine.

I see you were looking at a 24-7/8" long double eye spring for an 8,000 lb axle. Our most cost effective replacement for that is the following:

- 7-Leaf Double-Eye Spring for 8,000-lb Trailer Axles - 24-7/8" - Black # e89FV

It is recommended to replace all six leaf springs at once. That way everything is completely equal and they will wear evenly and be on the same maintenance schedule. You do not want to re use the U-bolts so you will need new ones. For that use part # APUBR-35 (one kit per axle).

expert reply by: Jesse M

Jesse M.

9/8/2025

Hey Steve, did you decide to go with the 7-Leaf Double-Eye Springs for your RV? I'm curious to know how they worked out for you, especially since you were considering replacing all six at once. Your experience could really help others in a similar situation!