TH400 Tranmission Street fighter BOP w/4in Tailhs

The TH400 Transmission Street Fighter BOP with 4-inch Tailshaft from TCI is purpose-built for street rodders, muscle car enthusiasts, and serious engine builders seeking bulletproof reliability in a compact, high-performance package. The Buick Oldsmobile Pontiac (BOP) platform compatibility makes this transmission ideal for classic muscle car restorations and modern street fighter builds where factory or early-generation three-speed performance no longer meets contemporary driving demands. This transmission delivers the legendary torque-handling reputation of the TH400 architecture while maintaining a factory-appearance footprint that simplifies installation into tight engine bays.

The 4-inch tailshaft design reduces overall transmission length compared to standard configurations, allowing fitment in vehicles where clearance between the transmission output and rear axle housing is compromised. TCI's Street Fighter variant incorporates internal improvements and sturdier components engineered to handle sustained street driving and weekend strip abuse without sacrificing daily usability. The transmission's cast-iron construction and proven three-speed planetary gear set provide mechanical simplicity, easier tuning for carburetor-to-fuel-injection conversions, and straightforward rebuild accessibility—critical advantages over complex overdrive units when working with vintage fuel systems or custom engine combinations.

Street fighters transitioning from two-speed Powerglide or three-speed manual transmissions will experience immediate improvement in launch characteristics and highway cruising efficiency. Installation requires verification of driveshaft length and rear axle housing clearance; the compact 4-inch tailshaft minimizes modifications to existing exhaust and suspension geometry. Compatibility extends across most BOP applications including Buick, Oldsmobile, and Pontiac platforms from the 1960s through 1980s, provided appropriate flexplate and engine block configurations are confirmed before ordering. Weight of 154 lbs positions this transmission as a direct swap in vehicles originally equipped with TH350 or lighter transmission assemblies.