MuscleRods LS Engine Swap Kit for 1970-1972 Chevy Monte Carlo
If you are planning an LS swap in a 1970 to 1972 Chevy Monte Carlo A Body chassis this Monte Carlo LS Conversion Kit delivers precisely located motor mounts and a crossmember that holds the crankshaft and torque converter at the correct drivetrain angle to cut out vibration. MuscleRods engineered the components to accept both 4L60E and 4L80E transmissions while providing clearance for deep oil pans without any grinding or on site modifications. Each steel bracket is made in the United States with TIG welds at key stress points for reliable performance on road or track.
Precise Drivetrain Geometry for Vibration Free Performance
This conversion kit holds the LS engine and automatic transmission at the exact plane needed to maintain factory drivetrain angle in a 1970-1972 Chevy Monte Carlo A Body chassis. By preserving the intended crankshaft-to-pinion alignment, it minimizes angular deflection at the universal joints, reducing vibration that leads to component fatigue. The carefully calculated mount positions also provide adequate clearance for aftermarket oil pans, eliminating the need for grinding or fabricating frame rails. The result is a smooth, refined driving feel under both light throttle and hard acceleration.
American Steel Construction with TIG Weld Precision
Each bracket and mount is fabricated from heavy gauge steel plate and features TIG welds at critical stress points to resist flex under torque loads. TIG welding delivers a uniform bead and deep weld penetration, boosting fatigue resistance where engine torque exerts the greatest force on the frame. All components are manufactured in the United States, ensuring strict control over material composition and weld quality. This robust build foundation stands up to daily driving and occasional track use without compromising alignment or durability.
Adaptable Crossmember for 4L60E and 4L80E Installations
The integrated transmission crossmember accepts both 4L60E and 4L80E units without requiring tunnel modifications or custom brackets. Precision-spaced mounting bosses and pre-drilled holes match the Monte Carlo frame rails for a precise fit, while the included polyurethane mount and spacers isolate drivetrain noise and harshness. By keeping the crankshaft and torque converter in the optimal plane, the design maximizes power transfer and protects the transmission input seal. Installers gain versatility for common GM automatic transmissions without extra fabrication or expense.
Unified Kit Layout Simplifies Installation Workflow
Rather than sourcing parts from multiple vendors, this complete package bundles two motor mounts, two frame brackets, the crossmember assembly, outer brackets, a polyurethane transmission mount with spacers, and a full hardware pack. Each steel piece is CNC laser cut to the exact contours of the A Body frame rails for immediate placement and accurate alignment. This unified approach eliminates trial-and-error fitting and minimizes installation time, making it ideal for professional shops and home builders alike. The cohesive design ensures every fastener and spacer is optimized for this Chevy Monte Carlo application.
Count on MuscleRods for a well engineered foundation for your LS swap. For a more robust customizable solution that lets you select parts to suit your needs see our Complete LS Swap Kits - LS Kit Builder.