TheGolem
Member
- Joined
- Mar 3, 2016
- Posts
- 35
- Reaction score
- 6
- Location
- Texas
- First Name
- David
- Truck Year
- 1987
- Truck Model
- V10 Suburban silverado
- Engine Size
- 350 TBI
I NEED HELP; I cannot diagnose a strange sound coming from my trucks driveline. When at highway speeds usually 60mph or above, if I go light on the throttle, I get this vibration/grinding sound (it is extremely bad when I utilize the cruise control). similar to when you strip a bolt, and the socket keeps spinning over it 
I took it to the mechanic, and he said U joints, but I replaced them this morning, and it didnt change a thing. It is a moving part (obviously) but idk which one. Its coming from the rear of the vehicle, maybe the differential? or could it be the transfer case? Rear end has plenty of lubrication. My transfer case (np208) for some reason is covered in mud (the only part of the vehicle that is) and has a slow leak coming from the bottom, but it works fine (with a little elbow grease). The transmission VERY audibly changes gears, especially to reverse, if that helps.....but I am out of Ideas. wheel bearings do not make this noise, correct?
ANY ADVISE IS GREATLY APPRICIATED
I took it to the mechanic, and he said U joints, but I replaced them this morning, and it didnt change a thing. It is a moving part (obviously) but idk which one. Its coming from the rear of the vehicle, maybe the differential? or could it be the transfer case? Rear end has plenty of lubrication. My transfer case (np208) for some reason is covered in mud (the only part of the vehicle that is) and has a slow leak coming from the bottom, but it works fine (with a little elbow grease). The transmission VERY audibly changes gears, especially to reverse, if that helps.....but I am out of Ideas. wheel bearings do not make this noise, correct? ANY ADVISE IS GREATLY APPRICIATED
