LS and LT Transmission Crossmember for GM B-Body
When dropping an LS or LT powerplant into a 1965 to 1970 Impala or Caprice chassis, this transmission crossmember solves the common alignment puzzle by using factory frame rail mounting points. By positioning the tail housing flange at the exact height and setback GM specified, it preserves driveshaft alignment and extends u-joint life. Fabricated from thick steel plate contoured to the frame rails, the unit also stiffens the surrounding structure to sharpen handling under load without any cutting or welding. Installers can bolt in popular units such as a 700R4 or a manual gearbox without trial fittings or shims.
Robust Steel Fabrication Contoured to Frame Rails
This crossmember is formed from thick high grade steel plate that matches the profile of 1965 to 1970 B-Body frame rails, providing exceptional resistance to bending and fatigue. Critical weld seams are positioned at high stress points to spread loads evenly, preventing deformation under hard launches or spirited cornering. By mirroring the stock frame contour, the unit integrates seamlessly with existing chassis geometry and ensures the transmission mount never shifts under torque. This level of structural integrity translates into reliable support for your LS or LT powerplant, even in daily driving conditions or track use.
Factory Mount Points for Effortless Installation
Designed to utilize the original mounting holes on Impala and Caprice chassis, this crossmember bolts in without any cutting, drilling, or custom fabrication. Installers simply align the unit with factory frame rail holes, insert supplied hardware, and torque to GM's specifications using common hand tools. The straightforward process eliminates the need for time-consuming trial fitting or shims, allowing a clean swap in minimal time. New builders and seasoned pros alike benefit from predictable fitment and a fully reversible installation that preserves the factory structure.
Optimized Driveshaft Alignment Extending U Joint Life
Positioning the tail housing flange at the precise height and setback that GM engineered is crucial for smooth power delivery, and this crossmember delivers on that requirement. By maintaining factory driveshaft angles, vibration is greatly reduced and u joint stress is minimized, which in turn extends component service intervals. Smooth torque transfer to the differential translates into a quieter cabin and consistent performance under load. This precision alignment also simplifies final assembly checks, removing guesswork and ensuring true concentric rotation.
Enhanced Chassis Rigidity for Sharper Handling
Beyond its role as a transmission support, the crossmember acts as a brace between frame rails, increasing torsional stiffness in the engine bay area. Enhanced rigidity reduces frame flex during acceleration and cornering, sharpening turn-in response and improving overall stability. This added stiffness not only benefits handling but also helps maintain consistent driveline alignment under high load, further reducing wear on mounts and universal joints. Enthusiasts will notice a more planted feel and precise feedback when pushing the chassis to its limits.
Engineered for precise fitment and reliable support. For a Related CRS product see our 1958-1964 B-Body Sure-Fit Crossmember (Only).