Sorry to disagree longbox55 2 wheel drive 5 stud 4x4 6 stud.might have to go back to older models.I have worked on 4x4 s10 so I know they are 6 stud. I have also read in past posts on this forum of this rear different being a good choice for installing in these pickups.one of the main reasons is that they are pretty close to the right width. The 2nd different is too wide. I personally use a 12 bolt different out of a 78 4x4 suburban so I can have the 6 stud axles (in a 54 3100 ) I feel the s10 housing is a bit light.