cant remember the exact number on my truck but it was 8 or 8 1/2 inches shorter....but heres the deal my truck is a 85 model...my rear end come out of a 97-98(cant remember exactly) model...completely differant bodystyle...so your gonna have to measure your rear hub to hub and figure out how much shorter your rear needs to be to get the tires under the fenders...then go to the junkyard and find a SRW rear and make sure its gonna be short enough to work for you....but 16 inch dually wheels wont clear SRW brakes iirc