MuscleRods LT Engine Swap Kit for 1977-1990 Chevy B-Body Caprice and Impala
Swapping an LT engine into a 1977-1990 Chevy Caprice or Impala can turn into a test of patience when mounts and brackets fail to line up; the 1977-1990 B-Body LT Conversion Kit provides precision steel mounts that bolt directly to the original frame rails and maintain factory ground clearance. Installers will appreciate that each crossmember and bracket is laser-cut for exact fit with 4L60E and 4L80E transmissions, removing the need to alter the transmission tunnel or guess at hole placement. With drivetrain angle held at factory spec and all components built in the USA, MuscleRods delivers a reliable solution for marrying modern LT power to classic Chevrolet architecture.
Precision Fit Frame Brackets for 1977 to 1990 Chevy B Body
The kit's laser-cut frame brackets bolt directly to the original chassis mounting points, eliminating the need for welds or spacers. By matching the exact geometry of Caprice and Impala frame rails, installers achieve consistent placement that preserves ride height and chassis alignment. This engineered solution reduces trial-and-error during installation and ensures both sides of the vehicle mount evenly. The outcome is a seamless integration of modern LT power without altering ground clearance.
Maintaining Factory Drivetrain Angle to Minimize Vibration
Correct output shaft alignment is critical for reducing stress on universal joints and eliminating driveline vibration. This kit positions engine and transmission at factory spec, enhancing smooth power transfer under acceleration. Integrated polyurethane bushings absorb road shock while maintaining precise alignment, keeping noise levels in check. Drivers benefit from refined operation and extended transmission life without extra balancing or custom driveshaft work.
Plug and Play Transmission Mounting for 4L60E and 4L80E
Designed to accept 4L60E and 4L80E transmissions without modifying the tunnel, the crossmember and mount locate the gearbox in the original factory footprint. This approach removes the need for cutting or reshaping sheet metal and retains stock heat shielding. Clear hole patterns allow bolt-in installation, saving hours of fabrication time. Enthusiasts can upgrade to a modern automatic while preserving the intact floorpan structure.
Robust American Fabrication with Grade 8 Hardware
All mounts, brackets and crossmembers are formed and welded in the USA from high strength steel and assembled using Grade 8 fasteners for maximum clamping force. This combination resists fatigue and corrosion through spirited outings or long highway miles. Durable polyurethane bushings hold tight tolerances under load and rebound to maintain alignment. Domestic production also ensures rigorous quality checks and quick access to replacement parts if needed.
Count on MuscleRods for high-quality performance. For a more robust, customizable kit where you can select parts to suit your needs see our Complete LT Swap Kits - LT Kit Builder.