Complete MuscleRods LS Engine Swap Kit for 1971-1976 Impala B-Body
Restoring a classic Impala often runs into alignment headaches when dropping a Gen III LS into the 1971-1976 B Body chassis and this 1971-1976 B-Body LS Conversion Kit steps in to resolve those issues. Tailored steel engine mounts and a precision crossmember bolt to factory frame holes to maintain the stock drivetrain angle while fitting 4L60E or 4L80E transmissions without transmission tunnel modifications. The design also accepts either a tall high clearance oil pan or a standard LH8 sump without reshaping the underbody, keeping installation time down and ensuring proper driveshaft alignment.
Precision Engine Mounts Preserve Drivetrain Geometry
The kit's motor mounts are constructed from heavy gauge steel and machined to exact tolerances, ensuring the LS engine aligns precisely with the original driveshaft path. This accuracy keeps the factory powertrain angle intact, reducing stress on universal joints and minimizing vibration under load. By preventing unwanted movement during acceleration, the mounts deliver a smoother throttle response and maintain consistent driveline geometry. Installers benefit from a true plug and play experience that requires no additional spacers or field alterations for proper alignment. The result is a stable ride that feels right at home in a classic Impala chassis.
Direct Bolt In Crossmember Fits 4L60E and 4L80E
This purpose-built crossmember and its matching brackets bolt directly to stock frame holes, positioning either a 4L60E or 4L80E transmission at the ideal height and angle without reshaping the tunnel. By preserving the stock floorpan structure, the design maintains chassis rigidity and original safety characteristics. A polyurethane transmission mount cushions driveline inputs and dampens vibration, helping to isolate harsh engine pulses from the cabin. With everything engineered to mate seamlessly, technicians can focus on fluid lines and wiring rather than fabricating custom supports, saving hours in the garage and ensuring a rock-solid installation.
Adaptable Oil Pan Clearance for Street and Track
Bracket geometry is optimized to accept both a tall high clearance oil pan and a low LH8 sump, giving builders the freedom to prioritize ground clearance or choose a compact underbody profile. Consistent frame rail spacing prevents interference with crossmember contours and suspension components, so there’s no need to modify the underfloor tunnel. Whether carving mountain roads or staging at the drag strip, you can tailor pan depth to your driving style and keep the factory underbody airflow intact. The clean mounting interface also allows full suspension travel without risk of contact.
Complete USA Kit Streamlines Classic LS Conversions
Every component required for the swap ships together in one package, including motor mounts, frame brackets, the transmission crossmember, crossmember brackets, an extra frame bracket, a polyurethane mount, and a full hardware pack. Manufactured under stringent domestic quality control, each piece meets precise dimensional standards for reliable, long-term performance. An additional isolator and bracket provide a margin of adjustment to fine-tune fitment and further damp vibration. This all inclusive approach eliminates sourcing headaches, letting enthusiasts go straight from unboxing to first start with confidence in their build.
Trust MuscleRods for a precise foundation and long lasting performance. For a more robust kit where you can build this same kit but this is a customizable kit where the user can select their own parts to better suit their needs, see our Complete LS Swap Kits - LS Kit Builder.