Hmmm, I wonder what the difference is on your trucks. I did this several times on three different shocks and never had an issue:

 

Tony (NorcalSS) told me that the lowest I should go with my rim/tire set up is 3/5. Any lower and I will rub apparently. I think I may do more like a 3/6..... Well see.

 

my driverside shock is leaking, im thinking of running some qa1's on it. my beware of flipped rears was i had about 800lbs in the bed and was killing the bump stops before my notch and it broke the welds on my bed side under the passenger tail light

 

low2001gmc, what wheel is that? It looks really good.