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Old 03-29-2009, 09:42 AM
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Drivetrain Swap

I'm working on a "66 GMC pickup. I'm looking to swap out the original 4speed (granny gear) and 2 piece drive shaft with a 700R4 automatic. Keeping the original Dana 44 rear end. Any suggestions as to removing old mounts, adding new rear mount and what to do for a driveshaft. I would like to go with a one piece shaft. It's in a longbed. I'm guessing a custom shaft to mate the 700 to the Dana. How about a newer 700 type shaft with the old yoke for the Dana welded on? I need to know about flex plates, electronic lockup controller, suggested convertor usage, etc. This is mating up with a 300+ hp small block, mostly for cruising and an occasional burnout. I appreciate any help with these questions.

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Old 03-30-2009, 07:15 PM
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this is simple to do all you need is a one piece drivshaft a couple or three inches longer than what you need and cut it down and weld the yoke back on with an old arc welder

you need an auto trans crossmember from any 63-72 2wd truck through 1 ton th350 or th400 both same also powerglide as well is same

column and linkage parts

column from a 63-66 and linkage form any year truck through 87 or 91 old body style will work just weld thepivot to the frame rail top side across for where the tanny shift shaft is located and the rod length is adjustable


one time in a '68 3 speed on the tree pickup i just kept the three on the tree column and use one of the two shift levers for the auto shift rod for the th350 i put in, and wired up the other one

worked great

anything else you need lemme know

i know all about the 63-72 and well alter trucks too have owned and torn apart and drivena nd built many since 94
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