I just did this mod on my 92 cherokee one of my axles had bad bearing wear, so i took it in to the local gear shop they sold me 29 splines from a 98 went in no problems I upgraded from open diff to a trac lock. The gear shop told me if I wanted to stay with the open diff I could use the same carrier just had to change the side gears from 27 to 29. Hope that helps.