Recommended RAS HD Kit for a 2015 GMC Sierra 2500
Updated 06/09/2026 | Published 06/08/2026
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Question:
I have a 2015 GMC 2500 HD with a 4” lift and 37’s. I tow a 38ft bumper tow trailer. Which RAS HD or RAS CHD should I be using?
asked by: Rod H
Expert Reply:
Hey Rod. Which RAS HD system you need is going to depend on whether or not your 2015 GMC Sierra 2500 came with a top overload spring. I have attached a picture below that shows what you need to check for.
Without Overload Spring - RoadActive Suspension Custom Leaf Spring Enhancement Kit item # RAS3611-HD
With Overload Spring - RoadActive Suspension Custom Leaf Spring Enhancement Kit item # RAS3611-CHD
Please note these systems are designed to work with the factory leaf springs. If your lift kit added any rear suspension components instead of lifting blocks you'll want to ensure there's no clearance issues.
What kind of lift do you have in the rear end of your Sierra?
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Product Page this Question was Asked From
RoadActive Suspension Custom Leaf Spring Enhancement Kit - Heavy Duty
- Vehicle Suspension
- Towing/Load Leveling
- Leaf Springs and Helper Springs
- Suspension Only
- Helper Springs
- Heavy Duty
- Rear Axle Suspension Enhancement
- RAS
more information >
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Rod H.
6/9/2026
Thank you for the information! It is a rough country lift. It is just blocks in the back.