R154 Swap Transmission Crossmember and Mount Kit for Lexus IS300

This kit is for the Toyota R154 5-speed swap into the Lexus IS300 and the GS300, GS400, GS430 and Toyota Aristo chassis. The R154 does not line up with the factory automatic crossmember, so the swap needs a member that puts the mount in the right place. This one bolts to the stock chassis mounting points with no cutting, drilling or welding, and works in cars that came as automatics or manuals.

The kit includes the crossmember, a MKIII Supra (1986-1992) style transmission mount, and the bolts that hold the mount to the crossmember. It is designed around that MKIII-style mount, so use the one supplied rather than a JZA80 or IS300 mount. A later JZX-series transmission can also be hung from this crossmember when it is fitted with the MKIII mount.

With the R154 bolted to the engine and supported on a jack, bolt the mount to the transmission, raise it into place, and bolt the crossmember up to the chassis. Check that the shifter sits centered in the tunnel before the final torque. The crossmember sets where the transmission tail sits, so the rest of the swap still needs a matching driveshaft, clutch hydraulics and shifter.