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Re: TH350 to TH400 swap
TH400's came in 3 different lengths.
1. 4wd configuration
2. 2wd Short shaft configuration
3. 2wd Long shaft configuration.
The 2wd short shaft is the same length as a TH350. therefore you won't have to move your crossmember or shorten your driveshaft. You will however have to change out the tranny mount and the yoke at the trans because they are differnet as well between the 2 tranny's.
If you're getting a long shaft then you will have to move the crossmember back on the frame (should already be holes in the frame for this)
You'll also need a kickdown switch for the TH400 which you can find in a wrecking yard. It's mounted on the accelerator bracket at the top.
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