Will RoadActive Suspension Kit Fit 2021 GMC Sierra 2500 With 6" Lift

Updated 11/13/2026 | Published 11/10/2026

Question:

Does the system work on 2021 GMC Sierra 2500 HD with a 6 inch suspension lift? Thank you

asked by: Donnie J

Expert Reply:

Hey Donnie! The RoadActive Suspension # RAS3611-HD will work with the 6" lift on your 2021 GMC Sierra 2500 as long as you still have the factory rear leaf springs. RoadActive Suspension confirms their kits generally work with lifted trucks. The main things to watch for are aftermarket leaf springs or unusually shaped lift blocks that could interfere with the mounting brackets.

What are you towing/hauling with your Sierra?

expert reply by: Robin H

RAS3611-HD
(click to enlarge)

Miguel

11/12/2026

Hi, I have heavy duty due to camper on truck. If you don’t have full weight on bed I would probably due the standard kit not HD it will be bouncy when unloaded or not towing at all. Might get too bouncy even though you can adjust height and spring tension. With weight it’s amazing difference.

Robin H.

11/12/2026

@Miguel appreciate you sharing your experience! The adjustability is definitely helpful for dialing in the ride depending on how much weight you're carrying.

Melvin

11/12/2026

It should work as long as you still have factory springs. I pull a 40 ft. fifth wheel RV with my 2026 2500HD I can definitely tell the extra support after adding the RoadActive Suspension Kit. Priced right and easy to install.

Robin H.

11/13/2026

@Melvin glad to hear the RAS kit is working well for you! That's a pretty big fifth wheel, so it's good to hear the extra support has made a noticeable difference.

Melvin

11/12/2026

Forgot to add...even with the added support, it does not made my truck ride rougher when the trailer is not hooked to it. Would buy it again in a heartbeat.

Robin H.

11/13/2026

@Melvin thanks for coming back to add that! Unloaded ride quality is a big concern for a lot of people, and the RAS is one of those options that typically won't make the ride noticeably rougher when properly adjusted.