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Re: TH400 to 700r4 Swap questions
TH400 are about the strongest trans out there and it takes a lot to break one. Usually it is lack of maintenance that kills them.
With the engine off and the truck in Park, crawl under and see if you can rotate the driveshaft. Check the U-joint and pinion areas for slop.
You know what just dawned on me, I am assuming it is for the '68 LWB in your signature, my guess is going to be the carrier bearing. It will make a thrashing noise, especially as the speed goes up. This will also rob power and cause other damage to things. Grab the driveshaft at the carrier bearing and see if there is any movement in any direction. It should be fairly tight and not move.
Willing to put my two cents on that part.
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