LS Transmission Crossmember for GM B-Body Chassis
If you are dropping an LS engine into a 71 to 76 GM B Body chassis you cannot compromise on how the transmission sits under load. This crossmember positions the gearbox at the exact angle and height to prevent vibration and reduce driveshaft stress for quiet highway running. Precision cut steel plate links the factory frame rails without any cutting or welding so installation moves quickly with common tools. By locking the transmission in line with the driveshaft you maintain smooth power delivery and lasting reliability throughout every rpm range.
Precision Positioning for LS Swap Transmission Alignment
Achieving exact transmission alignment is crucial in any LS swap to prevent vibration and premature joint wear. This crossmember is machined to hold the gearbox at the ideal height and angle relative to the B Body frame rails, ensuring the driveshaft remains straight under load. By removing guesswork, installers avoid repeated test fits and adjustments, saving time and effort. Smooth power delivery and quiet operation at all engine speeds are direct outcomes of this engineered fit. Whether cruising on the highway or launching off the line, the drivetrain stays balanced and responsive.
Reinforced Steel Plate for Chassis Rigidity
Constructed from thick steel plate, the crossmember doubles as a structural bridge between the frame rails, resisting twist when torque spikes. This extra reinforcement keeps suspension geometry settled so the chassis reacts predictably during cornering and hard acceleration. In rally or track scenarios, the improved stiffness preserves handling precision, preventing flex that can lead to uneven tire wear or vague steering feel. Over extended use, the steel plate retains its shape and strength, protecting your investment in both power and handling upgrades.
Rapid Bolt In Installation Without Welding
The design bolts directly to factory frame rail openings, fully eliminating welding or cutting steps. Pre drilled holes match existing mounts from 1971 to 1976 B Body models, allowing a straightforward fit with common hand tools. Clear instructions guide you step by step, so even a first time installer can complete the job in just a few hours. By preserving original frame integrity, the direct bolt in approach ensures the structure remains sound and requires no additional reinforcement or fabrication.
Corrosion Protection for Lasting Performance
Every crossmember surface is treated with a durable protective coating that blocks moisture, road salt, and debris from attacking the steel. This finish extends service life by reducing the risk of rust and preserving structural integrity through seasonal exposure. In coastal or winter conditions, the barrier continues to shield critical mounting areas, preventing pitting that could compromise fit or function. A simple wash and periodic inspection are all it takes to keep the surface in peak condition, safeguarding reliable support for your transmission.
Trust this crossmember for precise fit and lasting performance. For a Related CRS product see our 1958-1964 B-Body Sure-Fit Crossmember (Only).