I am researching doing this, except to make the back of the 1FZ look like the back of a Chevy motor. Toyota purity aside, the 6L80 is a much more suitable swap candidate for guys in the U.S.
Lots of donors, $900 controller to make it run behind anything, higher torque rating than A750 and better ratios for big tires: 4.03 1st, 1.15 4th ( making 4.10 gears effectively 4.71s while still having 2 overdrives to bring down rpms on highway).
The 6L80 is short enough that it’s possible to make it the same length as A343 even with adapter plates on front and back. (Although Marks 4wd adapter won’t work, too long; I have figured out how to make a 3.75” long tail housing with Novak adapters 6L80-Jeep/Dodge tail housing 3.25” and
@NLXTACY NV4500 to HF2A adapter plate .5”.).
The 6L80 *might* have to be notched to clear the 1FZ starter. It has a removable bellhousing, buy a new one for $100. Making an “adapter” bellhousing is challenging, back of a 6L80 bellhousing looks like a valve body.
I have finish the basement before I can proceed with the 6L80 project, so it’s on the back burner. In the mean time I am hoping that Cruiser Brothers really does come through with A750 bellhousing and controller. I am worried about price, I heard WAT charges $12,000 to retrofit the 5 speed auto into DIESEL 80s (no custom bellhousing needed for 1HD-T).