noise in rear

[Chad]

I have a 2000 Z28 with 3.73 gears. The gears were just put in but even before they were in i was hearing a loud humming noise coming from the rear when i would moderatly accelerate and when i would just let off the gas and let my car roll at the speed i was originally going. Some people told me its a pinion bearing but i just got all that replaced when i put the 3.73 gears in. Any clue to what it might be would be helpful. Thanks guys.

[NJ Torque]

Could be gear lash...

What weight fluid are you running?

[Chad]

im not sure actually...

[WildBillyT]

How high pitched is the noise?

[Chad]

well sometimes i can hear it over the radio, and if the radio isnt on at all its pretty loud.

[B4C]

gear wine? Just turn the radio up

[Chad]

yea thats what i usually do i just wanna make sure its nothing major...

[IROCZman15]

i could be wrong, but i've heard Richmond gears are "noisy" i have 3.73 richmonds in mine and they were noisy after the install, but i've just got used to it.. and this was 6 years ago. if they ween't rchmond then maybe u have an issue where they need to be shimmed/adjusted . check the wear pattern with that special paint if the whine is that bad. or it could be a bad posi unit?

[Chad]

they are richmond gears but i also had this noise before i put the gears in so its not that.

[Slow-V6]

Its a 10 bolt!! nuff said!