MuscleRods B-Body LS Engine Swap Kit for Caprice (1977-1990) and Impala (1977-1985)
Swapping an LS engine into a 1977 to 1990 Caprice or 1977 to 1985 Impala often stalls when stock brackets do not match the original frame geometry. The 1977 to 1990 B Body Caprice LS Conversion Kit delivers custom motor and transmission mounts that bolt directly to these frames with no tunnel modifications. By preserving the factory drivetrain angle, vibration is cut and chassis stress is reduced while retaining support for both 4L60E and 4L80E transmissions. Each bracket and crossmember is made in the USA by MuscleRods to precise dimensions so installers can move forward with confidence.
Precision Drivetrain Alignment for Caprice and Impala Frames
The kit preserves the factory engine and transmission angle on 1977–1990 Caprice and 1977–1985 Impala frames, which is vital for driveline health. By matching the original orientation, universal joints run smoothly and binding under load is prevented, reducing vibration and chassis stress. This alignment also limits torque steer and harsh feedback during acceleration, so drivers experience a more predictable response. Installers avoid the guesswork of custom bracket fabrication, achieving a seamless fit that protects steering and suspension components over the long term.
Polyurethane Transmission Mount for Reduced Vibration
Replacing factory rubber with a polyurethane mount and spacer assembly brings significant gains in durability and noise control. Polyurethane resists oil and fluid attack far better than conventional materials, so it retains its shape and stiffness even after extended use. During hard launches or spirited driving it holds the transmission firmly in place, yet still isolates harshness from the passenger compartment. Over time it exhibits far less sag and deterioration, ensuring consistent performance and reduced maintenance intervals.
Flexible Oil Pan Compatibility for Clearance Adjustment
Engineers designed the crossmember and frame brackets to accept either a tall clearance pan or an LH8 style design without interference. Builders can fine tune underbody space by choosing a high capacity sump for extended track sessions or a shallow system for lowered ride height on the street. This versatility lets you optimize ground clearance in line with suspension and steering geometry, without custom welding or grinding. The result is a tailored balance between oil capacity and undercarriage space that matches your project goals.
US Made Brackets and Crossmember for Reliable Installation
Every plate and bracket is laser cut and precision machined in the USA to strict dimensional standards, delivering a true bolt in installation with no transmission tunnel modifications. The heavy gauge steel components and crossmember work in concert to maintain exact frame geometry, so each swap repeats with the same fit every time. All required fasteners are included in the hardware pack, eliminating trips to the parts store and cutting overall build time. This domestic production approach ensures quality control at every stage, giving installers confidence that the kit will last through demanding use.
Count on MuscleRods for a solid foundation for your LS swap. To explore a more robust kit that offers customizable parts selection see our Complete LS Swap Kits - LS Kit Builder.