I know this thread is old and done but I must put my story in. I had a 1992 2wd ford ranger with the 4.0l and 8.8 OPEN rear end with 3.11s and a buddy of mine had a 1998 chevy z71 with the 5.7l. My truck sat higher, rode better, walked off and left his butt in a straight line, and with the right tires could keep up with him in the mud. Moral of the story, z71 is a joke. Just some extra numbers chevy folks can say to ford owners and have something to talk about when they are circle-jerkin at the gas station.