So I went to the 'tire store' and they swore by the balancing last weekend. I had the tech ride with me so he could feel how bad it was at 70 MPH. He said he thought it was something vibrating on the drive line. We put the truck up on the lift and noticed that there was wetness around the ring and pinion seal on the rear axle. There was also some play in the driveshaft, you could wiggle it back and forth a little. All 3 techs there said that I should take it too the dealer since that isn't right.
Have any of you had to replace a ring and pinion seal, drive shaft, or rear axle?
Oh yeah my truck is a NISMO w/ 56K on it.