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**old Rusty C10** · 10-08-2011, 07:54 AM

I belivee there is a difference in the driveshaft.. as i believe that the th400 is a little longer and im not sure if the yoke fits both models ( its been a long while. Other than that youll have to re arrange the vacuum on the motor and eliminate the one going to the trans as a 400 does not have a vacuum modulator.. IIRC the kickdownn cable works the same way. Make sure you use the correct torque convertor.
I do know that most of the pickups with 400s had the long tail trans (9 inches) as opposed to the short tail (6 inches) whereas the vans had the short tails

10-08-2011, 07:54 AM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,345	Re: TH350 to TH400 I belivee there is a difference in the driveshaft.. as i believe that the th400 is a little longer and im not sure if the yoke fits both models ( its been a long while. Other than that youll have to re arrange the vacuum on the motor and eliminate the one going to the trans as a 400 does not have a vacuum modulator.. IIRC the kickdownn cable works the same way. Make sure you use the correct torque convertor. I do know that most of the pickups with 400s had the long tail trans (9 inches) as opposed to the short tail (6 inches) whereas the vans had the short tails __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!