Transmission Crossmember 1964-1967 GM A-Body

The G FORCE CROSSMEMBERS Transmission Crossmember for 1964–1967 GM A-Body vehicles is a bolt-on steel component engineered to securely mount late-model automatic transmissions in classic muscle car platforms. This crossmember accommodates 200R4, TH400 short-tail, 4L80E, and 4L85E transmissions—the core gearboxes used in modern A-Body restorations and high-performance builds. Finished in black powder coat for durability and corrosion resistance, it delivers the structural support and alignment precision required for reliable power transfer in street and strip applications.

At 34.14 pounds and engineered to OEM mounting standards, this transmission crossmember integrates directly into the stock chassis without modification to frame rails. The multi-transmission compatibility eliminates the guesswork—whether stepping up to an overdrive 200R4, the bulletproof TH400, or the electronically controlled 4L80E/4L85E platforms, fitment is guaranteed within 1964–1972 A-Body specifications. Black powder coat provides a factory-correct appearance while protecting against moisture intrusion and road salt exposure over extended service intervals.

This crossmember is essential for hot rodders, restoration specialists, and vintage car builders executing LS swaps or Mopar big-block conversions that demand modern transmission architecture. It solves the engineering challenge of mounting contemporary gearboxes into platforms designed for 50-year-old hardware—eliminating vibration, transmission walk, and driveline misalignment that plague improvised mounting solutions. The bolt-on design means no welding, no frame cutting, and no custom fabrication, reducing downtime and labor costs while ensuring precision alignment with driveshaft, engine block, and chassis geometry.