3rd Gen Moser 9"
As an indicator...I am running a 4th gen 12 bolt in my 3rd gen. Im using 4th gen wheels as well. If I was trying to use 4th gen wheels with my 3rd gen axle, Ide need 2" spacers in the rear.
So...you can run the rear, but you'll need wheels set up with the 3rd gen offsets and specs. Which might actually look cool, since it will be "deep dished" compared to your fronts. Some guys like that look, and Ive seen it look pretty cool.
J.

