PJ_STYLES,

Check out:

http://www.stovebolt.com/techtips/t5tranny.htm

And, check out Jim Carter, Technical Articles, 1947-55, Speed Up 1948-59 GM Pickup:

http://www.oldchevytrucks.com/cgi-bin/htmlos.cgi/001619.11.11055243794717015150

Tim