Th350c Lockup Transpak

The B and M AUTOMOTIVE TH350C Lockup Transpak is a precision shift kit engineered to optimize transmission response and lockup characteristics on 1980–1986 Turbo 350 automatics. This compact, bolt-in modification kit is designed for drivers and mechanics seeking improved shift firmness, reduced slippage, and faster torque converter engagement without requiring complete transmission overhaul. Whether you're restoring a classic muscle car, upgrading a daily driver, or fine-tuning a performance build, the Transpak addresses one of the most common limitations of stock TH350C units—soft shifts and delayed lockup that rob horsepower and efficiency.

This transmission shift kit works by recalibrating internal pressure schedules and valve body hydraulics to increase shift force and accelerate torque converter lockup timing. The Transpak modifies shift feel without altering gear ratios, making it compatible with stock final drive ratios and driveline components. At just 1.75 lbs and measuring 10.2 x 2 x 11.4 inches, the kit is compact enough for straightforward installation during routine transmission service. The assembly uses OEM-quality materials and precision-machined components to ensure durability under both street and moderate performance driving, eliminating the vagueness common in aged stock valve bodies.

Mechanics and enthusiasts working on 1980–1986 TH350C-equipped vehicles—including Chevrolet, Pontiac, Buick, and Oldsmobile models—will find the Transpak an ideal solution for restoring transmission responsiveness without expensive rebuilds. Installation requires transmission pan removal and valve body access; no internal modifications to the case are necessary. The kit is particularly valuable for vehicles with higher-than-stock power outputs, where soft stock shifts cause excess heat and transmission wear. For buyers seeking measurable drivability improvement and proven reliability at a fraction of a full rebuild cost, the B and M AUTOMOTIVE TH350C Lockup Transpak delivers lasting results.