OK I think I get what you are saying. I go out and buy a used rear 1996 Kia differential. I remove the whole thing from the inside and replace the open differential with a LSD and it should all bolt on to the front housing. Now, will the shaft of the CV joint fit the carrier? Is it does, it is easy to do a LSD change in the front.

1985 Toyota 4x4 4Runner. 1989 Suzuki Sidekick 4x4.