Th700r4 Transpak

The B and M AUTOMOTIVE Th700r4 Transpak is a precision automatic transmission shift kit engineered for 700R4 and 4L60 transmissions from 1982–1993. Designed for enthusiasts and mechanics seeking sharper shift response and improved transmission control, this kit addresses the inherent softness of factory shift calibration without requiring complete transmission rebuilds or expensive upgrades. Whether you're tuning a street machine, restoring a classic Chevrolet truck, or optimizing a performance build, the Transpak delivers measurable improvements in shift feel and driveline efficiency.

This shift kit modifies the transmission's internal hydraulic circuits by adjusting valve body calibration, reducing shift overlap and tightening band and clutch engagement timing. The result is quicker 1–2, 2–3, and 3–4 transitions with minimal flare, improved throttle response correlation, and reduced transmission heat under load. The compact package—weighing just 1.95 lbs and fitting standard valve body geometry—requires no exotic materials or complex installation; experienced transmission builders can integrate it during routine service or rebuild procedures. The design maintains stock stall speed and torque capacity while refining how hydraulic pressure is modulated across all gears.

Owner-mechanics and professional shops favor the Transpak for muscle cars, hot rods, and performance trucks running mild to moderate power levels. Installation fits vehicles equipped with 700R4 or 4L60 transmissions—the common automatic in second-generation Camaros, Corvettes, Blazers, and light-duty Silverados and Sierras of the 1982–1993 era. The kit pairs well with shift improver springs, high-quality transmission fluid, and proper cooling upgrades. For builders prioritizing response and feel without full transmission replacement, the Transpak offers proven, cost-effective control enhancement backed by decades of B and M automotive engineering heritage.