I think it'd be easier to take a 8.4 rear housing and cut the tubes off and weld on the mini tube ends... then you would need to redrill, make the fron of the housing bigger.... blah blah blah.
Yes for the rear this would be much better the info I posted is mainly for the front. I think the taco rear is 60.5" so you could run it as is without to much width difference.
