Complete MuscleRods LT Conversion Kit for 1964-1967 Chevy Chevelle A-Body
If you are fitting an LT engine into the 1964 to 1967 Chevelle chassis this A-Body LT Conversion Kit provides the precise mounting geometry you need to secure modern power to a vintage frame. Built by MuscleRods around custom brackets and engine mounts the kit holds the LT motor at its ideal height and angle while allowing GM 4L60E and 4L80E transmissions to drop in without altering the floor tunnel. Every component is crafted in the USA to reinforce the frame rails under load reduce vibration transfer and maintain drivetrain alignment for a more controlled driving feel. This robust crossmember and transmission support work together to preserve chassis strength under hard acceleration and reduce wear on drivetrain components over time.
Custom Chassis Alignment for A Body Precision
This conversion kit is tailored to the exact dimensions of the 1964 to 1967 Chevelle A Body frame rails, ensuring the LT engine mounts mate perfectly with the original chassis. By matching block and frame tolerances down to thousandths of an inch, the design maintains ideal driveline geometry and avoids the common pitfalls of misalignment. Proper positioning under load keeps vibration transfer to a minimum and reduces stress on transmission linkages and universal joints. Installers benefit from consistent repeatable fitment without the need for shims or fabrication, saving time in the shop. The result is a powertrain installation that feels integrated with the vehicle rather than bolted on.
Engine Mount Engineering for LT Series Applications
The precision engineered mounts cradle Gen V LT engines at the recommended height and orientation, allowing the block to sit squarely within the factory motor bay. Each bracket assembly features robust gussets and fully welded joints to withstand torque during launch and hard acceleration. By anchoring the engine in its optimum position, the mounts prevent unwanted movement under load and isolate noise before it reaches the cabin. This stability also protects key components such as water pumps and accessory drives from premature wear caused by misalignment. For installers, the predrilled holes align directly with factory block bosses, streamlining the setup process and eliminating the need for trial fitting.
Reinforced Crossmember Structure for Torque Management
At the heart of this kit sits a heavy gauge crossmember engineered to reinforce the original A Body frame rails against modern power levels. Welded frame brackets spread load across a larger surface area, reducing flex when the engine produces peak torque. This increased stiffness preserves suspension geometry and ensures that steering response remains precise miles after installation. With the chassis rails reinforced, hard acceleration and spirited cornering no longer lead to frame distortion or uneven tire wear. The crossmember's design also incorporates a raised clearance profile to accommodate factory headers without compromising strength.
Optimized Transmission Support for GM 4L60E and 4L80E
This transmission mount carries the gearbox at the factory tunnel height, allowing direct installation of 4L60E and 4L80E units without any cutting or trimming of the floor. An integrated isolator cushions driveline torque and reduces snap between shifts, resulting in smoother engagement and a more connected heel-toe feel. By maintaining proper spacing between the engine block and transmission case, the mount also protects the sealing surfaces from undue stress. Builders choosing other transmission models can still adapt the system with minimal adjustments to hardware or isolator placement. Complete installation hardware is included, ensuring each component aligns precisely for reliable operation.
Count on MuscleRods for straightforward installation and reliable 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 LT Swap Kits - LT Kit Builder.