TH400 Transmission: From Muscle Car Legacy to Modern Performance Powerhouse When it comes to transmissions that can handle serious power, the TH400 transmission has long been the go-to choice for high-performance applications. Originally developed by General Motors in the 1960s, the TH400 became a staple in muscle cars, drag racing, and...

Common TH400 Transmission Issues and How to Fix Them 1. Slipping Gears If your TH400 transmission is slipping, it means the gears are not engaging properly, resulting in power loss and inconsistent acceleration. Slipping is usually caused by worn clutch packs, low transmission fluid, or internal pressure issues. Symptoms: The...