Strange noise from rear end, possibly diff...

[l33tmonkeyman]

i was driving home tonight and half way home i started to hear this whining noise from the rear end whenever my vehicle is moving. it doesnt matter if i am in gear of if i am in neutral, the whining noise still occurs unless i am stopped. Sounds like it could be coming from the rear diff. I just did a fluid change in the rear diff and put the recommended GL5 in there. I am not sure what this sound means. if anyone has any ideas it would be a great help.
1992 240sx.
5-spd w/open diff

[Dweezil]

If it happens in neutral, it can't be the rear end. Does it only happen when the car is moving, or does it matter?

[l33tmonkeyman]

it only happens when the vehicle is moving. if it is in gear and i give it gas, the noise gets louder. but when i dont have any gas applied or if i do not have the vehicle in gear i will hear the whining noise a little quieter until i come to a stop

[aznpoopy]

get someone to stand outside the car and roll by a few times. see if they can't better pinpoint the noise for you.

maybe
#1 differential
#2 hubs
#3 some noise from the brakes

seeing as how you just worked on the diff, its probably the differential.

[l33tmonkeyman]

i had a friend change out my fluid and it wound up that he didnt fill it up all the way. i redid the diff fluid change yesterday and now the noise is pretty much gone. he got a talkin to all right. thanks for all the input!!

[ghostuss]

omfg. LOL.