Quote:
Originally Posted by 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.
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The motor mount rubber and the lower bracket are absolutely NOT the same between the V8 and inline 6. I found a pair in Arkansas and paid $80 for the pair including shipping. Dealer wanted $150 each. They dropped right in. One of the three bolts that holds the bracket to the frame actually hits the rubber part of the engine mount so I will trim off them by an inch or so. Bought new motor mounts and paid about $45 each for those from the Chevy dealer.
Right now, my cab is 5" off the frame in the front and 4.25" in ther rear. If you drop your cab to 3" off the frame, it will definitely need a larger trans tunnel.
Thanks for the driveline angle lesson. I will step back and rethink this a bit.