LS Transmission Crossmember for 1970-1981 F-Body
If you're fitting an LS motor and 4L60E or 4L80E transmission into a classic F-Body, this crossmember solves the dilemma of aligning the drivetrain at its original pitch without any cutting or welding. Once bolted in place the formed steel design matches 1970 through 1981 frame rails and holds the powertrain at the exact factory angle. By using prepunched holes that align with stock mounting points installers maintain exhaust and fuel clearances while resisting twist under heavy loads. That means you get reliable driveline geometry and minimal vibration on both the street and track.
Precision Adoption of Factory Driveline Geometry
When installing an LS motor with a 4L60E or 4L80E transmission into a 1970 through 1981 F-Body chassis, maintaining the factory angle is crucial for smooth operation and component longevity. The crossmember's formed profile follows the original frame rails to preserve correct driveline geometry, ensuring the driveshaft centerline remains true under all conditions. This careful alignment limits unwanted vibration and NVH in the passenger compartment while reducing stress on universal joints and carrier bearings. The result is consistent power delivery and more predictable throttle response, whether cruising on the highway or accelerating hard on a road course.
Formed Steel Construction Delivering Torsional Strength
Crafted from thick rolled steel plate, this crossmember provides the rigidity needed to resist twisting forces generated by high torque outputs. During rapid throttle transitions or aggressive cornering, the design shows minimal deflection, protecting weld seams and fasteners from fatigue over thousands of miles. Precision welding maintains uniform strength across the entire assembly, so the connection between transmission case and frame rails stays rock solid. With such structural integrity in place, driveline angles hold steady and vibration is kept to a minimum for both daily driving and spirited track days.
Seamless Bolt In Installation and Frame Rail Matching
Installation is simplified by prepunched holes that align precisely with factory frame rail patterns, eliminating the need for cutting or welding. Technicians can rely on the supplied hardware or reuse original fasteners while following clear instructions that include torque values and sequencing. This design preserves critical clearances around exhaust pipes, fuel lines and brake plumbing, avoiding time-consuming adjustments or trial fittings. By fitting like an original equipment part, the crossmember maintains underbody access for routine maintenance and ensures the exhaust system retains its designed routing.
American Craftsmanship Ensuring Lasting Reliability
Proudly made in the USA, this transmission crossmember reflects a commitment to quality control and material consistency. Each unit begins with premium steel plate, inspected at multiple stages to meet strict standards before forming and welding. The heavy-duty surface also serves as an ideal canvas for corrosion protection methods, allowing builders to choose their preferred coating. Backed by domestic manufacturing processes and clear documentation, the result is a dependable component that gives installers confidence in both street reliability and track endurance.
Backed by American craftsmanship for consistent factory alignment and minimal vibration. For a Related CRS product see our 3rd Gen F-Body Crossmember (Only) 4L60E.