Drive shaft

My buddy has a 05 6.0 excersion hes staying with a 4" lift instead of 6'' because of that reason
 
I'm running an 8" lift on mine and it doesn't vibrate. Just have to switch to the new 05 style shaft with a cv joint.
 
My truck is stock, not lifted, but I pull a 30ft gooseneck all the time. I have a little shutter backing up or sometime if I take off from a stop.
 
I would say that shutter is probablyyour clutches in the tranny slipping a little bit. It could also be the carrier bearing in the driveshaft going out. But I highly doubt that a stock height truck will have an issue with the driveline angles. How many miles on the truck with pulling that trailer?
 
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