Th350 Transpak

The TH350 Transpak from B and M AUTOMOTIVE is a premium transmission shift kit engineered for drivers seeking improved shift quality and performance from their TH350 three-speed automatic transmission. Built for both street and high-performance applications, this shift pak addresses the factory transmission's soft, delayed shifts by recalibrating band and clutch engagement pressures. Whether you're upgrading a classic hot rod, muscle car, or modern restomod, the TH350 Transpak delivers the crisp throttle response and gear engagement that separates a tuned transmission from stock hardware.

This shift kit works by modifying the transmission's valve body and pressure regulation system to increase line pressure and reduce shift lag during acceleration and deceleration events. The TH350 Transpak uses precision-machined components and calibrated springs to tighten shift response without introducing harshness or reducing transmission longevity when properly installed. The compact design—weighing just 2.03 lbs and measuring 10.35 x 2.1 x 11.45 inches—makes installation straightforward for experienced mechanics performing a pan-drop service on their TH350. Upgraded shift feel translates directly to better throttle control, smoother power delivery, and more predictable gear changes under load.

Mechanics and enthusiasts restoring or modifying classic Chevrolet, Pontiac, Buick, and Oldsmobile vehicles with TH350 transmissions will find this kit essential for matching modern shift expectations to vintage powerplants. The TH350 Transpak is compatible with all standard TH350 applications from 1969 onward and installs during routine transmission service without requiring machine work or custom fabrication. Installation requires basic transmission knowledge and proper pan gasket sealing procedures; many shops include this upgrade alongside torque converter replacement or fluid service for optimal results. For drivers seeking improved shift quality on a budget-conscious modification, this shift pak represents proven B and M engineering with decades of trusted performance history.