I had a initial high pitched whine which sounded like a pinion gear. Then started getting a serious vibration when off the throttle or going down hill/coasting over 70mph...almost rumble strip bad. Had all U-joints replaced on both driveshafts with Spicers and the vibration is still there. I took it to a Chevy dealer first and they said metal in the front Dif. Took it over to an independent tranny shop and the guy gave me the same diagonals so we replaced the front Dif with a re-man.
Now I have a low pitched whine and the vibration above 70 is still there but not as bad. It's a buzz I can feel through the steering wheel and feet and it is accompanied by a low frequency noise(my hearing is shot, but I can still hear low frequency stuff better than most). Tranny guy is stumped. Dealer had replaced the RT front wheel bearing before I bought the truck, so is it possible that the left wheel bearing is causing this?
I am going to get it up on my 4 jack stands and throttle it up to see if I can isolate this vibration....it sure is hiding well. What can vibrate when it is NOT under a load in the drive-train?
Now I have a low pitched whine and the vibration above 70 is still there but not as bad. It's a buzz I can feel through the steering wheel and feet and it is accompanied by a low frequency noise(my hearing is shot, but I can still hear low frequency stuff better than most). Tranny guy is stumped. Dealer had replaced the RT front wheel bearing before I bought the truck, so is it possible that the left wheel bearing is causing this?
I am going to get it up on my 4 jack stands and throttle it up to see if I can isolate this vibration....it sure is hiding well. What can vibrate when it is NOT under a load in the drive-train?