I don't think the bell housing is removable on these tranny's. You could probably use both the 2.0 engine and tranny. If it's long enough and will match up to the transfer case you could have 4 wheel drive. If not, you might have to use your 2wd drive short drive shaft and eliminate the 4wd. The hanger bearings on both my trucks are roughly the same distance from the rear end (as near as I can tell with my tape measure). 2wd and 4wd bearings are slightly different but I believe the bore is the same. If you end up converting it to 2wd you might want to swap the rear end also as the 4wd is geared low.