Thanks Cadboy. Saw your post in another thread on this topic & decided to go another direction to find my problem. Unfortunately I have been talking to a bunch of hillbillies though. Check this out for luck.....
I decide to take it to the dealer. They quickly diagnose the problem as a u-joint problem, the rear one by the rear diff. The "service adviser" (ain't that a joke) tells me they found the rear drive shaft & u-joint are not a factory units (on a 3 yr old truck with 65k miles), and that the found a small sliver of metal sticking out of the u-joint. Charge me $45 for the diagnostic. And advise me to get a u-joint at Driveline, Inc. in Post Falls.
So I go to Drive line Inc. and the guy tells me it IS a factory driveline & u-joint. Of course the Three Rivers factory decal might have been the dead giveaway. He tells me he has the u-joint & their like $18. I pull the debit card & he tells he doesn't take plastic. WTF
Is this 1971 or what?!
So I go to the nearby Chevron gas station. Their ATM is dead. And they won't do anything out of their till. I tell the towelhead working the till he's seen the last time I buy gas there.
So I go further up the road & finally find another ATM, get the cash & look across the street & there is a Napa. So screw it, I'll just get it at Napa & go back to work for now.
Later I get home & pull the drive line out. Takes me about 1.5 hrs. Would have taken less if I'd read the thing about melting the snakes out of the u-joint. I clean things up & go to install the new u-joint. Guess what..... Napa gave me the wrong one.
So tomorrow I'm going to have a "conversation" with the service adviser at the Chevy dealer, then another "conversation" with the knucklehead at Napa. Maybe I'll get it all back together tomorrow. And then maybe my vibration problem will be done with.