Actually the easiest way to do that is to replace the closed drive shaft SM318 3 speed with a later open drive SM318 from a Task Force truck.

From my previous thread reading, I'm pretty sure others have done that very swap. Perhaps those that have will chime in with their experience and input? thumbs_up


~ 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)