found this on jeeptech.com ------------The ZJ Dana 44 is the only Jeep Dana 44 with an aluminum differential housing. It is also a C-clip axle with one piece shafts and a 5 on 4.5" wheel bolt pattern. Because of the aluminum housing and C-clips, it is not really any more desirable than a Dana 35c. The shafts are 30 spline. so i shouldnt spend money on that i guess, dam just cant win lol