Brian, On my '51 3100, there is no "transmission mount" for my SM420 4 speed. The 4 speed is bolted to the bell housing which is supported by the rear engine mounts bolted to the bell housing and crossmember. Are you converting yours to a 4 speed???
I am not converting my truck. It came with a 4 speed. But when I pulled the engine / trans to have the engine rebuilt there was a "mount" the Ball at the End of the trans.
