I took the rear blocks out of mine, added lowering shackels droped it 4" then i uncranked the "T" bars all the way.
Mine sets at 34" front to back with 275/55/20s on 20x10" Helos Max 6s tires are real close on a ful turn.

2006 Z71 4 door 5.3L with 3:42s locked
Flowmaster with 2.5" duals and 4" Stainless tips
K/N drop in
lowered 2/4

HELO MAX 6s 20/10s with 275/55/20s

Slick side topper
Windows tinted
Billit grill