Timbren GMRCK15S SES Rear Helper Spring Kit for GM Full-Size Trucks

Upgrade the rear suspension of your GM full-size truck with the Timbren GMRCK15S SES Helper Spring Kit. Designed for 1999–2012 GM 1/2-ton trucks, this suspension enhancement system provides additional support for hauling and towing while maintaining a stock-height appearance. The OEM-style design integrates with the factory suspension and helps improve vehicle stability under load without requiring air lines, compressors, or routine maintenance.
The Timbren GMRCK15S kit uses durable rubber SES springs engineered to work progressively as the load increases. Under light or unloaded conditions, the system preserves a comfortable ride and normal suspension operation. When your truck is carrying cargo or towing a trailer, the springs engage to help reduce rear-end sag, improve handling, and support more controlled performance. The black finish provides a clean, factory-compatible appearance, while the included hardware helps simplify installation.
Built for demanding truck applications, this Timbren rear helper spring kit supports up to 8,600 pounds of capacity and is intended for GM full-size truck owners seeking dependable load support. Installation is designed for the rear suspension and stock ride height, making it a practical solution for work trucks, towing vehicles, and daily drivers. Verify vehicle compatibility before installation and follow the included instructions for proper fitment and operation.

Features:

• Application: Rear suspension support for GM full-size 1/2-ton trucks from 1999–2012

• Brand and Part Number: Timbren GMRCK15S

• System Type: SES progressive rubber helper spring kit

• Design: OEM-style, stock-height suspension enhancement

• Material: Durable rubber construction with a black finish

• Capacity: Supports up to 8,600 pounds

• Installation: Includes required mounting hardware

• Maintenance: No air lines, compressors, or regular adjustments required