Join Date: Nov 2003
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Re: Your opinions on transfer case to use
The 20 will hold up just fine, but doesn't have a very low low range. (Basically about the same as the 205- 2.0to1)
The D300 has around a 2.6to1 low range, which will help your crawl considerably.
That said, the 700R4 is a fairly long tranny, and the CJ5 is a very short Jeep. Fitting all that driveline in is going to be tough. I have friends who have swapped SBCs in early '5s, and they had a rough time with the rear driveshaft. Granted, the early CJ5 is about 2.5" shorter, but they were using a TH350, not a 700R4.
If there is a 700R4 that swaps to a D300 without an adapter, that would probably be your best bet for making it fit.