I think I will take two wheels off the truck and take them with me when I go pick up the rear end. I'll need rollers on it anyways and I can see exactly if they will fit or not. If not I guess I can back out of the deal. I have no knowledge of what constitutes a fair price for a used rear end. In Southern California there are few salvage yards due to environmental and the high value of land. So it could be a matter of supply and demand of the local mkt. Thanks for the tips. I'll check around.
