The Damyprd Transmission Boost Spring (Part# 77763-01) is engineered to resolve common 3-4 clutch failures in 4L60E and 4L65E transmissions. By increasing apply pressure by up to 30%, this high-tension spring significantly reduces clutch slippage during aggressive shifting or towing, extending transmission lifespan. Crafted from SAE 9254 alloy steel and hardened to 48-52 HRC, each spring maintains consistent force delivery across 500,000+ cycles. The 10-pack configuration provides cost efficiency for professional rebuilders, while the OEM-spec dimensions ensure drop-in compatibility with factory housings. Note: For optimal results, pair with Damyprd's 4L60E/65E performance clutch kits (sold separately).