to do it right firstly you would need to swap the coil towers from left to right. this way the coils will be inline with the diff, and not hanging off the back. you can use zook gear, just depends on how much work you want to do and how loyal you are to the zook badge.
this has a widened coily diff with jimny axles. plenty wide enough for an early vit. i hated my jimny, i really did, but one thing i could not do was kill the front axles, and i ditched it at abot 150k. you can get chromos from europe now to suit the jimny also. and you can keep you're rear diff the same.