[GCncsuHD]

Thanks as it's the spacing I need.....is this a standard spacing issue or is it dependent on your wheel/tire/kit combo too?

Well from the factory the rear track width is about 1.5" narrower than the front. Lifting the truck makes it more noticeable, and your RCX knuckle lift spaces the front out about another 1" per side. 1.5" spacers in the rear usually even it up nicely. I run 2" spacers in the rear because my Fabtech lift spaces the front out even wider.