Complete MuscleRods LS Engine Swap Kit for 1963-1972 Chevy/GMC C/K Trucks and K5/Jimmy
The 1963 to 1972 GM Truck LS Conversion Kit was engineered to solve the alignment and clearance challenges of installing an LS engine under the stock tunnel of early GM half ton trucks. Precision CNC machined motor mounts lock the LS block at the ideal angle, while the tailored crossmember and side brackets slip into factory rail holes for zero cutting or grinding. It accommodates popular transmissions like the T56, 4L60E and 6L80E, and supports both raised sump and LH8 oil pans for variable ground clearance needs. Constructed from American steel and secured with factory rail locating holes, this drivetrain alignment solution delivers long lasting rigidity and helps preserve frame integrity when towing or spirited driving.
Precision CNC Machined Motor Mounts Ensure Accurate Alignment
The kit's motor mounts are produced with CNC machining to maintain exact block angles under the stock tunnel of 1963–1972 GM trucks. By securing the LS engine at a precise geometry, driveline angles remain optimal, reducing unwanted vibration at the universal joints. This repeatable accuracy eliminates installer guesswork and helps bearings, seals, and couplings endure heavier loads with less fatigue. The result is smoother power delivery and quieter operation, backed by the tight tolerances inherent in computer controlled fabrication.
Purpose Built Crossmember and Brackets Preserve Factory Frame Structure
The custom crossmember and side brackets slip into factory rail locating holes to support popular transmissions such as the T56, 4L60E, 4L80E and 6L80E without cutting or grinding. By using existing frame points installers avoid weakening the chassis, preserving the original rail strength for towing and hauling duties. This bolt in design streamlines the swap process for both professional shops and home builders, ensuring the transmission sits exactly where intended beneath the stock tunnel. End users benefit from a robust mounting platform that retains factory resilience and ride quality.
Adaptive Oil Pan Compatibility for Varied Ground Clearance Needs
Supporting both raised sump and LH8 oil pans, the conversion kit accommodates different driving conditions with no custom modifications. The raised sump version lifts the reservoir to clear off road obstacles, while the LH8 pan maintains a low profile for street and garage use. Both options attach through OE bolt patterns so there is no need for welding or slotting. This flexibility ensures reliable oil control and protection across diverse terrain without compromising fitment or requiring aftermarket adapters.
American Steel Brackets and Polyurethane Mount for Vibration Isolation
All frame brackets are formed from heavy gauge American steel, delivering the strength required for spirited driving or towing. A polyurethane transmission mount dampens shift shock and isolates drivetrain vibration before it reaches the driveshaft or cabin, enhancing comfort on long trips. The included bolt kit features grade specific hardware to maintain clamp force under load and prevent loosening over time. This combination of resilient materials and engineered design preserves universal joint life and gearbox integrity for years of trouble free use.
This MuscleRods swap kit delivers precise alignment and reliable performance for your LS engine conversion. For a more robust kit that lets you select components to match your needs see our Complete LS Swap Kits - LS Kit Builder.