MuscleRods LS Engine Swap Kit for 1973-1977 A-Body Chevelle/Monte Carlo
Tackling an LS drivetrain swap in a 1973-1977 A-Body chassis can become time consuming without precise brackets and mounts, and the 1973-1977 A-Body LS Conversion Kit delivers engine and transmission supports for 4L60E and 4L80E use with no floor pan modifications. Across A-Body platforms the kit locates motor and frame brackets to maintain correct drivetrain angle, reducing vibration and stress on universal joints. By clearing tall oil pans with its custom crossmember layout, ground clearance stays intact for daily use on uneven roads. Manufactured in the USA from billet and plate steel, this Engine Swap Kit from MuscleRods delivers a precise fit to minimize fabrication time.
Precision Motor Mounts for LS Engine Load Distribution
The kit includes two motor mounts machined from thick plate steel to withstand the full weight and torque of an LS powerplant. Precision drilling and flat mating surfaces ensure consistent alignment between engine block and subframe, reducing flex under high load. Reinforcement ribs cast into the mounting areas help distribute stress, preventing localized fatigue and maintaining reliable positioning over thousands of miles. This approach protects the structural integrity of both the engine and chassis while promoting predictable power transfer.
Integrated Polyurethane Transmission Mount for Vibration Control
A dedicated polyurethane transmission mount and spacers are provided to isolate driveline vibrations without sacrificing strength. The elastomeric material flexes under harmonic loads, reducing noise and harshness transmitted through the chassis. By cushioning shifts and torque spikes, the mount helps preserve universal joint life and prevents frame brackets from developing fatigue cracks. These spacers also allow fine adjustment of driveline angle for seamless engagement of the 4L60E or 4L80E unit.
Custom Frame Bracket Geometry for Broad A Body Model Fit
This conversion kit features two frame brackets and matching outer crossmember supports designed to match the rail dimensions of 1973 through 1977 A Body models. Predrilled holes align with factory subframe bolt patterns on Chevelle, Monte Carlo, Cutlass and other chassis without modification. The bracket geometry maintains the correct engine tilt, preserving ground clearance and reducing vibration at the driveline coupler. Builders benefit from a universal fit solution that adapts to slight factory tolerances across multiple vehicles.
Comprehensive Hardware Pack for Organized Assembly
The included hardware pack contains all necessary fasteners, lock nuts, washers and spacers, each labeled to match its bracket or crossmember counterpart. Grade eight bolts ensure a reliable clamp force, while hardened washers prevent loosening under heat cycling. Organized packaging streamlines the build sequence and removes guesswork during installation. With every component supplied, fabricators can avoid parts runs and focus on completing the swap with confidence.
Count on MuscleRods for precise engineering and reliable support, and for a more robust kit that lets you customize each component, see our Complete LS Swap Kits - LS Kit Builder.