GMC Repair: 2002 yukonxl 4wheel drive, vibration analyzer, vibration problem

Question
I've got a vibration problem, GM replaced drive shaft and universals, ring and pinion - still have vibration around 65 -75 mph.

Answer
Hi
Has the tires and wheels been checked?
The BEST way to pinpoint a vibration at this point would be to have GM hook up the EVA (Electronic Vibration Analyzer) to your truck and have the vibration analyzed.
MOST techs at dealerships find it time consuming and would rather spend YOUR money and not to properly diagnose the vibration.
I would get the Service manager involved.
If that is no help, I would then get the dealer, or dealership manager involved.
The EVA IS an essential tool, so all dealerships SHOULD have one and be trained in Vibration Correction.
a 10 minute job, IF they know what they doing .
I Hope this helps
Pawl