[QUOTE
When did GM go from an enclosed drive line to an exposed drive line? [/QUOTE]
I don't know what year it started, and I'm no authority on big bolts, but heavy duty trucks had an open drive before light duty trucks did. I just pulled a 4 speed out of a '51 GMC
1 1/2 ton that was open drive line all the way.
(before and after the carrier bearing)
