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Ok guys I have swapped in a 454BBC and now swapping the th350 for a th400 and a ford 9" rear. I know that my crurrent x member will still work for the th400 BUT now I gotta find out if the driveshaft will still work or if I will have to get it shortened? If it has to be shortened how do I go about figuring what dimensions are needed to shorten up my drive shaft?
 

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1974 chevy. Ova
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going from a GM rear to a 9" i'm almost certain that the length will change. it may change from the 350 to the 400 trans as well, and your yoke will almost certainly change. if memory serves me right, the 400 yoke is a 32 spline and the 350 yoke is 27 spline.
 
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