SKU: GFCRCG-4L80
MPN: RCG-4L80
The 84-88 GM G-Body 4L80 transmission crossmember is a purpose-built structural component designed for builders swapping the legendary 4L80E four-speed automatic into classic second-generation G-Body platforms, including the Chevrolet Monte Carlo, Buick Regal, Pontiac Grand Prix, and Oldsmobile Cutlass. This crossmember is essential for those upgrading from factory carburetor-era transmissions to ensure proper fit and function.
Engineered by G Force Crossmembers, this application-specific crossmember is manufactured from high-strength steel to handle the 4L80's substantial torque capacity without flexing or deflection under hard acceleration or track use. It locates the transmission at the correct ride height, manages driveline angles, and ensures the bellhousing clears the original floor pan while maintaining proper U-joint geometry. The assembly measures 51 inches in length with a footprint of 11 by 6 inches, providing robust mounting points that bolt directly to the original frame rails without modification.
This crossmember is ideal for 1984–1988 G-Body owners executing a 4L80 swap, whether building a street cruiser, drag machine, or restomod that demands reliable automatic transmission performance with modern internals. At 32 pounds, it adds minimal weight while delivering the rigidity needed to prevent transmission tunnel vibration and ensure smooth power delivery during shifting under load. Installation is straightforward, utilizing original frame locations for a direct fit.
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