my truck has had a noise in the rear for some time now. i was told that it was the r&p, and it made sense. it is a vibration/rattle that occurs mostly at nuetral throttle, and it happens much more at 70mph and above than below 60 or so. my ten bolt went out a few months ago, and i dropped a 12b with 4:56's and an auburn. the rattle was still there. i suppose the gears coulda been on their way out, but the guy i bought it from swears they came out of a running truck, and they were good. i got them through here, so i'd rather believe that it's something else. someone suggested that my driveshaft is too short, but i don't want to drop another $150-200 on a guess. it has to be hurting something on my truck, but it's been there for like two freakin years. as long as i drive it mellow, with nice, smooth throttle, it will take me to work and back just fine, and run the whole damn family to oregon, if i need. we crawl under and make sure everything is tight, and the rattle doesn't go away. things vibrate loose, and the rattle/noise gets louder, but then we tighten everything back up. i can't keep a soda in my center console, because the truck vibrates it all outta the can. anybody good with drivetrain issues be willing to ride in a norcal bigdawg's truck to troubleshoot?