Like skeet said, It depends on your setup, And trust me Skeet knows his stuff.

I have a RCSB 00 Silverado, was a work truck also nothing fancy, Threw an Iron Headed LQ4/4l80 combo, stock with 3.42s CAI and tune and was runnning 15s.
I think with just the pure fact of having a 4l60e youll be in atleast high 14s