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Old 03-23-2005, 11:27 AM
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th350 - th400 tranny swap

Sorry if this question has been beat to death. I did a search but didnt find what i need or just didnt put in the correct search words

Anyway
I have a 79 gmc 1/2 ton with a TH350,one peice drive shaft, with a caddy 500. I plan on swapping this to a TH400 but (if i remember right) i think the th400 is a bit longer than the th350 I think I will also need to go with a two piece drive shaft rather than my one peice for the 400??.
If I go with a th400 and a two peice shaft will this bolt right up??

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Old 03-23-2005, 12:40 PM
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350s

The 350 tranny comes in different lengths. They have different tail shaft housings. I think they are 6 in and 9 in. One of them is the same length as a 400.
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Old 03-23-2005, 05:08 PM
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Short tail 350 and short tail 400 are the same length, only requires slip yoke change. If you go to two piece driveshaft, use a bolt-on yoke 400 if possible.
Short tail is ~6" long
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