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i had my rear diff re built not to long ago and when i was talking to the guys at the shop they told me that when the gear set in the rear diff have a larg amount of slack in them that can cause a wineing noise you might just want to see if they can tighten it up for you.
How much did it cost to rebuild the rear diff? How do they tighten it up? Did it work? I forgot to mention that i have the whining noise when in park and the truck not moving.
well the sound I was talking about only happens when you are moveing not sure about when in park. and I am not sure of the end cost on the rebulid cause it was still under warrenty at the time. but if its doing it while in park i don't think its the same problem anyway. are you sure it is the drive line. I have herd about flywheels going bad.