One strange irony is that I purchased this truck specifically because it is very close to stock and my first impulse is to put a 1964-67 transmission and modified driveshaft in it. I didn't mention that a previous owner put in a fairly new, modified exhaust system that crosses over right behind the existing 3-speed that would have to be scrapped and replaced with a 4-speed installation. I think I'd be better off just addressing some deferred maintenance and driving it for a while. Thanks Mike, Gord and Fred for spelling out for me the ramifications of "improving" this driveline!

Dave

1946 Chevy pickup, 1948 Chevy suburban, 1950 Chevy pickup, 1952 GMC pickup, 1957 Chevy pickup, 1939 Chevy pickup