Hey I've got a 2000 silverado ext cab z71. I recently had a driveline clunking problem when accelerating from a dead stop. I took it into the tranny shop to have them regrease the slip-yoke under warranty, which did not fix the problem. The guy took my driveline off and shook it back and forth for me, apparently this is the clunking noise I'm hearing. He priced out a new driveline at 660 plus install and tax would be 750. Anyone have any thoughts on this? I don't think I'm tearing anything up by driving it how it is. Just the inside piece of my driveline is bouncing around.. If anyone does think I should replace it the question is then aftermarket or oem? And where to buy it? Thanks guys.