65 232 and a jeep th400??

One other thing to think about the TH400 is a horsepower hog and I don't think you'd have much grunt behind a engine that small.

The move to Chrysler autos is fortuitous now, but if AMC had continued with Borg Warner autos there would be hop-up parts available for it still. B&M made a hop-up kit for the M-11/12 for a few years in the late 60s, but they stopped making them in the mid 70s due to lack of demand. If the BW trans had been used longer they'd have continued making those parts available longer. The BW has an undeserved bad rep. It's a great trans within it's power level design. The M-11/12 is an improvement over the Ford FMX, which is based on the M-8 design (through a partnership with BW, which also was responsible for earlier Ford autos). Development stopped about the time AMC stopped using them. Even the Chrysler trannys only hold up to so much power in stock form, though there is no argument that the 727 is stronger stock than any of the BW models.

Honestly, I don't know if BW (US) or AMC made the decision to stop producing autos in the US. BWs European and Japanese divisions (Aisin Warner -- who makes the excellent AW-4 used in Jeeps with 4.0L) continued development. I can only assume that something like the AW-4 would have been developed over here, and possibly something even stronger had there been a need. AMC may not have been providing enough sales for BW to continue making trannys in the US, or AMC may have just got a better deal from Chrysler. I've never heard which... AMC was the only US customer, many Euro and Aisian cars used BWs.