LS and LT Transmission Crossmember for GM B-Body
When integrating an LS or LT into a mid sixties B-Body Impala or Caprice chassis, this transmission crossmember takes the guesswork out of driveshaft alignment. Crafted from thick steel plate and shaped for each 1965 to 1970 frame rail, it mounts directly into the original bolt holes to preserve factory geometry without cutting or welding. Installation is straightforward for both novices and seasoned builders and the added support improves chassis rigidity for consistent handling under road loads.
Heavy Gauge Steel Plate Designed for LS and LT Torque
The crossmember is formed from thick, high quality steel plate engineered to endure the intense load characteristics of LS and LT powerplants. By using a substantial gauge material, the structure resists bending and fatigue that can occur under repeated acceleration or sudden throttle transitions. Critical weld seams are placed at known stress locations along the frame rail interface to create a continuous load path that spreads forces evenly. This design not only protects the transmission mounts from deformation but also contributes to overall frame rigidity. As a result, drivers experience sharper handling response and consistent performance under everyday driving conditions and spirited runs alike.
Bolt In Installation That Preserves Factory Geometry
This transmission crossmember bolts directly into the original frame rail holes without cutting, drilling, or welding. By retaining the factory mounting points, it secures the transmission at the exact height and setback originally engineered by GM. Builders of all skill levels save time and avoid measurement guesswork thanks to a precise hole alignment that mimics the stock crossmember layout. The straightforward process allows a novice to install the component with basic hand tools while a seasoned technician can complete the swap even faster. Preserving the original geometry means the chassis and driveshaft maintain their intended relationship, reducing installation headaches and potential alignment errors.
Maintain Optimal Driveshaft Angle and Reduce Vibration
Accurate driveshaft alignment is critical for minimizing vibration, universal joint wear, and premature component failure. This crossmember's mounting geometry holds the transmission flange at a factory specified angle that matches the original driveshaft orientation on 1965–1970 Impala and Caprice chassis. By eliminating sloped or misaligned mounts, the system prevents binding at the joints and delivers smooth power transfer from engine to differential. Consistent angle control also helps preserve the balance of the rotating assembly, which translates to a quieter cabin and reduced maintenance over time. Enthusiasts benefit from a driveline that operates as quietly and reliably as the factory intended.
Versatile Transmission Support for GM Automatic and Manual Units
Whether pairing an LS or LT engine with a 700R4, 4L60, TH350 automatic, or a popular manual gearbox, this crossmember ensures correct transmission placement. Each mount location is engineered to accommodate the specific bellhousing pattern and tailshaft clearance of these common GM units. Builders gain the flexibility to choose their preferred transmission without fabricating custom adapters or brackets. The unified design accelerates project planning by offering proven compatibility with a range of transmissions and engine swaps. Ultimately, this versatility streamlines installation and guarantees consistent driveline behavior regardless of powertrain combination.
Count on MuscleRods for precise fit and consistent support and consider our Related CRS product 1958-1964 B-Body Sure-Fit Crossmember (Only).