Originally Posted by wilhavens
I have the 3" and will be installing a 6" RCX soon, i was looking at 39.5 IROKs, seeing your truck with the 37s makes me think they will fit. any thoughts?
Iroks do run smaller then indicated (from what I know) and I believe they measure the same as 38's and 38's fit no problem. They could measure 38.5, but not at my computer to check
So I think you will be ok.
But there is certainly room to fit them