what is the bolt pattern on the rear of the tranny? is it four bolts in a 'square' pattern as is the TH350? I don't know what you are starting with, but have included a picture w/ the 350 adapter and the 465 adapter. I would say count the number of splines on the sleeve if its still in the adapter or the number of splines on teh input shaft of the transfer case if it was still connected. Last option is if it doesn't look like one of the two in the picture it must be the adapter for the TH400.
did they put th400 with small blocks in the 4x4's?
Paul
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