First, I know this is the chevy forum, you can rant me all you want, but sense my new drivetrain is made up from 2/3 GM, this might be appropiate.

I have a question concerning a SBC 350 swap in my 78 CJ-7.
My transmission came out of a 1980 Wagoneer, a TH400. I know the TH400 is a chevy trasmission and a normal one would bolt right up to any first gen 350, but I've recently been told that when AMC were using the transmissions, they used a different bellhousing pattern. I've been looking for adapters to solve my problem between the chevy 350 and the AMC TH400, but have come up with nothing. Is this due to the fact that there isn't a huge market for the adapter or was I told wrong about the different bellhousings? And if the bellhousing is different, what would be the easiest (hopefully the cheapest as well) way to fix my problem, besides getting a GM TH400 and just getting an adapter for my transfer case? It would suck the big one if I had to get a different transmission, because I recently had my current TH400 rebuilt.

The AMC engines used a different bellhousing bolt pattern than a chevy 90 deg. engine, but the back end of the TH400 transmission is the same. The cheapest and easiest thing to do would be to get a junk chevy TH400 and have a tranny shop swap the guts from your fresh TH400 into the chevy housing.

The very first jeep TH400s had removable bellhousing adapters bolted to chevy TH400s due to a holdup on AMC TH400 cases. Chances are your AMC TH400 is not one of these, but check to make sure. If it is, you can unbolt the adapter and the bellhousing will work on the chevy engine.

Adapters are available, but why go that route? For what you'd spend on an adapter kit you can get a junk Chevy TH400 case and have a trans shop swap the parts. This way everything will bolt up like factory.

You don't say what t-case you're using, but this is also the time to get the proper output shaft installed in the chevy trans since they have to remove it anyway to swap the guts into the chevy case.

Well to solve my problem about the tranny alot cheaper than to buy a $300 adapter is to just goto the junkyard and grab a junked TH400, swap out the guts, and drop that in. I THOUGHT for the life of me I had a dana 20, but the junkyard dealer told me the drivetrain that came out of the wagoneer was from 1980, which would make it a dana 300, but what would he know. Either way I already have the adapter for the transfercase.

How much of an offset is all this gonna be on the length? Should I be able to reuse my same shafts?