73-87 Chevy C/K Series to Cummins 6BT Motor

The 73-87 Chevy C/K Series to Cummins 6BT motor mount is the backbone of one of the most sought-after diesel swaps in the classic truck community. If you're serious about transplanting a legendary Cummins 6BT turbodiesel into your first-generation C/K platform, this crossmember assembly is non-negotiable. Built by G FORCE CROSSMEMBERS, this engineered solution bridges the gap between the original Chevrolet frame geometry and the substantial weight and different mounting points of the 5.9L Cummins powerhouse, ensuring proper drivetrain alignment and structural integrity throughout your build.

This motor mount crossmember is precision-engineered to accommodate the 6BT's casting architecture while maintaining factory-equivalent load distribution across the frame rails. The compact footprint—7.5 x 7 x 7.5 inches—belies its structural rigidity; at 10.4 lbs, the assembly combines high-strength steel construction with strategic reinforcement points that isolate engine vibration and prevent parasitic harmonics from degrading adjacent components. Proper motor mounting is critical when swapping displacing significantly more torque than the original small-block or inline six; inadequate support leads to frame flex, transmission tunnel interference, and premature wear on engine seals and driveline components.

This crossmember is essential for enthusiasts pursuing reliable, long-term 6BT integration in 1973–1987 Chevrolet C10, C20, K10, and K20 trucks. Whether you're building a daily-driver workhorse or a weekend off-road rig, proper engine mounting translates directly into predictable handling, reduced vibration transmission to the cab, and extended drivetrain longevity. Installation requires careful frame-to-mount alignment and is best performed alongside a complete motor-mount evaluation to ensure all attachment points are torqued to spec and that no binding occurs during full steering and suspension articulation.