1978-1979 C3 Rear Monospring Leaf Spring Kit – Fiberglass Composite 340 LBS
Fiberglass Composite 340 LBS Performance
Upgrade your Corvette’s rear suspension with our 340 lb Fiberglass Composite Rear Monospring Leaf Spring Kit, precision-engineered for 1978–1979 C3 models (except the Anniversary Edition). Designed as a direct-fit master upgrade, this spring replaces the original steel unit with a lightweight composite solution that enhances ride comfort and handling without sacrificing durability.
This spring is 32 lbs lighter than its steel counterpart and is specifically tailored to fit 1978–1979 Corvette differential covers that accept 2.5" springs using 7/16" bolts with a 5/8" hex head. This is a performance spring rate for these models, offering an updated blend of ride quality and performance for daily and spirited driving.
A complete hardware package is included to ensure easy installation, including bolts, nuts, cotter pins, rubber grommets, cups, washers, and a special heat shield for long-lasting performance.
Features
• Fits all 1978–1979 Corvettes (excluding 1978 Anniversary Edition)
• Performance 340 lb spring rate – ideal more performance and handling
• Engineered for 2.5" spring differential cover using 7/16" x 5/8" bolts
• 32 lbs lighter than original steel spring
• Includes spring bolts, nuts, cotter keys, rubber grommets, cups, washers, and heat shield
• Patented TRW composite spring design for improved performance
Dimensions and Weight
• Spring Width: 2.5"
• Weight: Approximately 18 lbs
• Shipping Weight with Hardware: ~24 lbs
Tech Notes
• Does not fit 1978 Corvette 25th Anniversary Edition
• Confirm differential cover bolt specs before installation
Take Action
Restore and refine your 1978–1979 Corvette’s suspension with this 340 lb Fiberglass Composite Rear Monospring Leaf Spring Kit. The performance spring rate you need—with the comfort and performance you want.
Also known under these part numbers: (For reference only)