I just got my 89 and got an 87 parts car with an auto. So, 6 hours labor could swap my 5 speed to the auto? The Auto trans is already out of the 87 sitting in the back.

The guy I bought it from was going to do it as part of the deal, but he was a lose screw and really didn't want him messing with it. He was saying the rear end had to be changed as well, is this correct? All parts were going to be from the 87.

And if changed, what mileage should be expected? I drove the 89 300 miles on the interstate at 60, mostly 65 and got just over 21 MPG! I thought that was very good for a 4x4 of its age.