[pcwillsie]

To run a 7.5 backspacing you are going to have to 4 link the rear end or move the leaf springs inboard to keep you factory suspension you can only run about a 5 inch backspacing and that is getting very very tight. I am running 15x12 wheels with a 4.5 backspacing with 15 inch tires on a 73 stepside. The tires stick past the lip just a hair but not bad enough to worry about since I am not going to lower mine very much