Transmission Crossmember 78-88 GM G-Body 700R4

The Transmission Crossmember 78-88 GM G-Body 700R4 from G Force Crossmembers is designed for builders and mechanics undertaking 700R4 transmission swaps on second-generation A-body and G-body Chevrolet and Pontiac platforms. This crossmember addresses the structural challenges posed by OEM crossmembers, which were not engineered to support the weight and torque characteristics of the 700R4 four-speed automatic transmission.

Constructed with a black powder-coated finish, this crossmember is resistant to rust and corrosion, ensuring durability in engine bays where moisture and heat can lead to oxidation. Weighing 23.93 lbs, it provides robust support while minimizing flex and NVH (noise, vibration, harshness) during high-performance driving. Its length of 51.5 inches is designed to fit various applications, although some installations may require minor adjustments.

This crossmember is essential for anyone building a restomod G-body or performing a 700R4 retrofit on 1978–1988 GM A-body and G-body vehicles. It bolts directly to the frame, making installation straightforward for most users. Whether converting a Chevelle, El Camino, or Grand Am, this crossmember is a critical component for achieving reliable overdrive capability.