Looking For New Leaf Springs And Shackles For 2019 Grand Design Momentum 399TH

Updated 09/08/2025 | Published 06/03/2025

Question:

I have a 2019 399TH Grand Design momentum and I want to replace the leaf springs and shackles. Can you let me know what product you have that fits this model RV? Thank you. Sue.

asked by: Sue L

Expert Reply:

Hello Sue, thanks for reaching out. We should certainly have the parts you need, but there is no way to look up your camper to know exactly what leaf springs and shackles you need. RV/Camper manufacturers just are not that specific with their online literature.

Your best option will be to jack up one side of the trailer and take a few measurements. Measure the eye-to-eye length of the unloaded springs. Also note the number of leaves on the spring, and your axle weight capacity. With that info I can determine what spring will work for you.

While you are at it, also measure the length of your shackle straps. Those are measured from center hole to center hole.

Reply here on this page with all that info and I am happy to look into it and make some recommendations.

expert reply by: Jesse M

Jesse M.

9/8/2025

Hey Sue, did you have a chance to take the measurements for the leaf springs and shackles on your RV? I'm here to help you find the right parts once you have that information.