Brian, On my '51 3100, there is an "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???

Last edited by Gdads51; 12/16/2024 5:09 PM. Reason: corrected my incorrect info
~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)