LS and LT Transmission Crossmember for GM B-Body
When installing an LS or LT powertrain into a mid sixties B-Body coupe, maintaining proper crossmember placement is vital to ensure precise driveshaft alignment. Crafted from thick steel plate, the crossmember bolts directly to factory frame holes on Impala and Caprice rails for a secure fit without any cutting or welding. By matching the mounting points for popular transmissions such as the 700R4, 4L60 and TH350, it retains the factory driveshaft angle to minimize vibration and premature wear on universal joints. Even builders tackling LS and LT swaps for the first time will appreciate the straightforward installation process, and the extra chassis support adds rigidity that sharpens handling under everyday driving conditions.
Durable Steel Construction Resists LS and LT Torque
Forged from heavy gauge steel plate, this crossmember stands up to the increased forces delivered by LS and LT powerplants. Critical weld seams have been strategically placed at stress points to prevent bending under hard acceleration or rapid throttle changes. The robust structure integrates directly with the frame rails to distribute engine and transmission loads evenly across the chassis. As a result, drivers experience a more stable platform that endures daily driving demands without compromise.
Precision Bolt In Mounting Maintains Drive Angle
The crossmember uses existing frame holes on Impala and Caprice rails for a true bolt in installation with no cutting or welding required. Each mounting point is located to preserve the factory driveshaft angle from the start, ensuring optimum driveshaft alignment. By eliminating fitment guesswork, builders avoid common errors that lead to vibration and universal joint fatigue. Even first time engine swappers gain confidence knowing the driveline geometry remains factory correct.
Exact Fit Tailored to 1965 to 1970 B Body Frames
Every contour and flange matches the unique architecture of mid sixties B Body Impala and Caprice undercarriages. This exact fit preserves original load paths and prevents stress concentrations that could cause frame distortion over time. The crossmember sits flush against the rails to maintain factory handling characteristics while accommodating today's engine output. Enthusiasts benefit from a seamless integration that respects classic design and performance goals.
Versatile Transmission Support for Smooth Operation
Engineered for the 700R4, 4L60 and TH350 automatics as well as popular manual gearboxes, the crossmember positions the transmission flange at the precise height and setback. This ensures smooth driveline bandwidth and minimizes unwanted vibration that can accelerate component wear. Builders enjoy the freedom to choose their preferred gearbox without custom brackets or adapters. The result is consistent performance and simplified project planning from start to finish.
For a related CRS product see our 1958-1964 B-Body Sure-Fit Crossmember (Only) ensuring continued reliability.