With the motor mounts completed, the transmission mount was next. Walton Fabrication offers this crossmember that replaces the original, the central saddle is adjustable for a wide range of GM transmissions. This particular car was to be fitted with a 200-4R overdrive trans, which owing to the shape of its sump pan required a different saddle, as well as a notch in the crossmember (arrowed) to allow clearance for the speedometer drive on the 200-4R. If you're using this trans, make sure you specify this when ordering. The crossmember is supplied with all relevant hardware.