This doesn't answer your question, but why not make life easy on yourself and just bolt a TF727 with a Dana 300 behind your 360, no adapter needed. The 727 is at least as strong as a Turbo 400, possibly even stronger.
what transfer case do you have? if you run a d300 then find a fsj with a tf727 auto and 208 t-case. the 208 is a d/side drop butit can be removed and the d300 will bolt right up. i run a chevy vortec 350 with a th400 that used a 208. i removed the 208 and put in my d300 with a 32spline input adapter shaft and it bolted right up. i'm not sure about the fsj 208 adapter but the chevy 208 adapter clocked my d300 up nice and high. now if my atlas would only get here!!!
...i still have the 1988 Grand Wagoneer...does that have the right automatic?!..from bellhousing to middle u-joint is 27 5/8" the GW is some where like 45" long...I might as well have a wrangler driveshaft HAHA...I was looking for something a little shorter. Just wondering.
We have a 727 inbetween a 258 and a Dana300 in our 80 CJ7. Don't know what it came from but it bolts right up to the engine and transfer case and all the mount holes line up perfectly. It is 23 spline. It measures 23" from the front face of the bellhousing to the rear face of the adapter to the transfer case. About 6" of lift are required for the front driveshaft to clear the bulge on the 727 pan. Don't worry about strength, the 727 was used behind the mighty 426 Hemi and also in motor homes.
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