Anyone know stock backspace on a '05? Are all wheel variations of the same offset. Fabtech states that stock wheels will not fit the 6" lift, I am assuming due to backspace.

 

The lift should give a recommended or required backspacing. I think possibly around 4.5 inches of backspacing will be required with the lift. Check the lift specs. Stock wheels are 7.5 inches wide with around 5.5 inches of backspacing. You will need new wheels if you get the lift.

 

Cool beans.
I have a fabtech six inch I need to install. I was just curious what the stocks were and why they do not work. The fabtech calls out a five inch backspace.

 

If I remember correctly, the way the Fabtech knuckles are desiged, the OEM wheels will hit them. That is why you need a wheel with less than 5.5 inches of backspacing.