Complete MuscleRods LS Engine Swap Kit for 1977-1990 B-Body Caprice and 1977-1985 Impala
When you set out to install a Gen III or Gen IV LS engine into a 1977 to 1990 B-Body Caprice or a 1977 to 1985 Impala, misalignments in the driveline and limited underbody space can stall a swap. The 1977-1990 B-Body Caprice LS Conversion Kit solves this with precision laser cut steel brackets and a custom crossmember that preserve factory engine tilt and deliver a drivetrain alignment solution. It fits both 4L60E and 4L80E transmissions without modifying the tunnel and accommodates tall oil pans or the LH8 sump profile for reliable clearance on lowered or track focused builds. Fabricated from domestic heavy gauge steel the complete hardware pack ensures every component bolts directly to the frame rails for repeatable results with standard hand tools and no custom welding.
Precision Bracket Engineering for Proper Engine Tilt
Maintaining the original engine tilt is vital to preserve universal joint angles and ensure reliable oil pickup on LS swaps. This conversion kit uses laser cut brackets that precisely match the factory engine angle, reducing vibration and preventing driveline binding under load. By holding the powerplant at the correct pitch, the system avoids the common problem of misaligned shafts causing premature wear in u joints. The result is a stable driveline that delivers consistent performance whether cruising on the highway or pushing hard on the track.
Streamlined Bolt In Installation with Complete Hardware
Every bracket, mount and fastener arrives in a single hardware pack so builders can start work without searching for missing pieces. Two motor mounts and matching frame brackets line up with factory rail holes for a direct fit that eliminates drilling or welding. Crossmember brackets and a driver side Z bracket secure the transmission, while a polyurethane mount and spacers cushion the driveline and damp road shock. Installers finish the swap with basic hand tools and avoid transmission tunnel cuts or custom modifications, saving hours on each project.
Engine and Transmission Flexibility for Gen III and IV LS Builds
Adaptable design supports most Gen III and Gen IV engines, from LS1 and LS2 blocks to larger 6.0 liter variants. Builders can pair their chosen LS with either a 4L60E or 4L80E unit without altering the tunnel or frame. Oil pan clearance works for tall pan designs or the LH8 sump profile, so underbody space stays open on lowered or track focused cars. Modular bracket geometry ensures each combination retains optimal ground clearance and reliable oil system performance.
Laser Cut US Steel Construction for Durability and Consistency
CNC laser cutting of domestic steel plates provides tight tolerances and clean edges that standard plate cutting cannot match. Each bracket aligns perfectly with the Caprice and Impala frame rails, creating rigid mounting points that resist bending during hard launches or cornering. Built in the USA under strict quality control, these steel components deliver consistent thickness and weld integrity, preserving frame strength and factory structure for the life of the vehicle.
Count on MuscleRods for a straightforward installation. To access a more robust kit that lets you choose parts to suit your swap needs see our Complete LS Swap Kits - LS Kit Builder.