[ricott]

Your driveline angle should be no more than 4 degrees down, but it needs to match the driveline angle of your pinion. I have a digital angle finder (easier on my poor eyes) that I use. I level the frame rails front to back (any jacking done to level, I do on the front to keep the rear wheels as loaded as possible). I then zero my digital angle finder and attach it to the pinion yoke. If it reads + 3, then I attach it to the tranny output shaft and move the tranny up or down until it reads - 3. Hope this helps. I was looking at the driveline tunnel on my wife's 07 5.3 Envoy last night trying to anticipate cab problems. It sure looks like you will need a center tunnel to achieve full driveline travel (my plan is to set the cab at around 3 inches over the frame). One question, it appears the part of the motor mounts that bolt to the frame and the rubber cushion are the same between the 6 and the V8, can you confirm? I found a 5.3 envoy oil pan/pickup tube and windage tray, I'm looking for the motor mounts.