He's right, the C-6 is a BIG
Lots and lots of trans there...
You will need adaptors for both engine and transfer case.
Does your radiator have factory auto trans cooling line ports installed? (most do)
TH-400 came factory in the CJ-7, and I still have the TH-400 that came out of mine...
'Texas 5' adaptor, and fresh internal wear parts.
Reasonable price or more importantly, interesting trades accepted.
The good part of this is it's a bolt in, already has the AMC bell housing bolt pattern.
I think I still have spacer plate, flex plate and ring gear here for a 304 also...
If you are interested, I'll look and see.
Actually, most people get along fine with a TH-350, especally in mud, and I've been preaching the 700R-4.
700R-4 has lower 1st gear, and a 0.93 over drive for highway usage in the age of $4 a gal. gasoline is something to consider.