Next TN Jeepz ride.
Depends on the year and type of 4wd system.
-The Quadratrac 4wd always had an offset rear diff, won't work.
-Early SJ's had a D44 front with pass. side diff, won't work.
-Late model SJ's have a driver's side diff D44, this will work. Some came with vacuum disconnect, so you could have either.
-The rear is either the D44 or HDAMC20. The 20 diff looks like a big basketball, the 44 is more squared off.
Late '80's and early '90's are the most common for the D44's front and rear that you need.
I'm picking up an SJ D44 with vacuum disco ($50) next week, then all I need is the Scout rear D44, for my '95 YJ.