Recommended RAS HD Kit for a 2015 GMC Sierra 2500
Updated 06/09/2026 | Published 06/08/2026
Products Featured in This Question
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?
You can add this information, along with any other questions you have, where it says Add Comment.
(click to enlarge)
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 >
Continue Researching
- Q&A: Which Roadactive Suspension Kit for 2022 Ford F-150 4WD
- Q&A: Will The Hellwig Load Pro 35 Heavy Duty Helper Springs HE93XR Lift The Back Of A 2025 Sierra 2500?
- Q&A: Which Hellwig Anti-Sway Bar is Right for My 4-Wheel Drive 2026 Ford F-350?
- Q&A: Choosing Between Timbren SES and RoadActive Kit for 2022 Silverado 2500 Towing 5th wheel
- Q&A: Roadactive Suspension Kit Recommendation for 2019 Ford F-150
- Q&A: Does HD RoadActive Suspension Use Bump Stop Spacers On 2024 Ford F-150
- Q&A: Can Roadactive Suspension System Have Tension in Spring Lowered to Not Affect Ride Height
- Article: How to Winterize & De-Winterize Your RV (Simple Guide)
- Article: Choosing the Right Suspension Kit for Your Truck and Trailer
- Article: RV Sway Control, Stabilization, and Suspension Enhancement
- Article: Stability Control for Heavy Duty Vehicles
- Article: 5 Things to Know About Weight Distribution Hitches
- Article: Timbren Suspension Enhancement Systems
- Article: The 5 Best Trailer Drop Hitches You Can Buy
Rod H.
6/9/2026
Thank you for the information! It is a rough country lift. It is just blocks in the back.