Thats allot..looks like 4"...? theres allot of turret top to that body style cab, "just a suggestion" but you might wanna think about taken 2" out of the window area, and 2" out of the turret area of the roof, to avoid havin' the chop job look like a bald guy with squinty eyes when yer done. just a suggestion..chop jobs are always allot of work