You could use both Isuzu 4FB1 1.8L or its larger brother the Isuzu C223 2.2L; just find an Isuzu diesel pickup transmission with transfer case though you could use the stock Jeep drivctrain and have a bellhousing to fit (the bellhousing though to use were fairly rare in US, in our country there are available and mostly fits Toyota W40/W50 steel-case transmissions).Greetings from Oregon. My shop with tractors ( and everthing else ) burned during the fire season. Willies made farm jeeps and a friend gave me a 1949,
along with two engines that both turned out to be dead soldiers. I had an 82 I mark coupe years ago that was a little four cylinder diesel, and it appears they came
in a bunch of other types of equipment. the engine was small, 1.7-8 or 2.2, and might fit easily in the hole.
The size and weight seemed more or less equal, and for my use the little diesel is like the Hotchkiss engine done by the french. Building a L134 is horribly expensive,
while the isuzu, appers to be available for much less. The insurance company, basically gave me a proctology exam, along with the check. I had two tractors, needing both,
and the willies would fit the plan pretty well here. Being somewhat senior, ( 80 ) The issues is fitment with the willies as the bell housing includes the brake peddle and clutch
mount, so the engine needs a mounting plate or something too align the engine and bell housing and the clutch plate etc. This is not my expertise, although I am reasonably
mechanically savvy. Al of my equipment is diesel, part of the reason for my fantasy.
Any possible information is welcome, and I have heard of other types of this swapping business.
With all respect and thanks for any comments or ideas.
Lieutenant Robert Powell
Oregon City, Oregon
Using the Isuzu drivetrain though requires you to use a centered rear axle and possibly a different front axle if the transfer case output is on the wrong side.