dunno about your r&p's going in or not, probably just take the 3rd's the gears are in and bolt up, i know ZR2 put a pre 98 3rd on his with 5.12's to fit a lockright. i have an 03 tracker 4cyl, nobody has a locker for it, not even arb, they all stated that the diffs would need to be changed..... good luck, i hope you find a good solution.