all right ive got an 88 xj with the ax-15 and np231 with the sye and wood shaft. so i have found that im wanting lower gears im already running 4:10 in the axles. i really dont want to buy gears again.I found that you can get the low gear kit but 1400:flipoff:. so what other cases will mate up to the ax-15. ones with a real 4:1 thanks for the info.