Driveline noise

[Mleigh3582]

I have a 2003 GMC 1500 ext.cab with a 2/4 drop kit. It's a Mc Gaughey's (spelling). I used their bracket to relocate the carrier bearing and installed 4 degree shims on the rear axle, I can't seem to get the vibration out of it. I have moved it up to 2300 rpm or 75 mph. Any suggestions appreciated, Mark

[usmc50lx]

try it without the bracket, or was it still doing that before the bracket install? Remove the shims or try a few more degrees of pinion angle. Hope this helps,Paul