nik1703

Have a humming noise coming from either the driveshaft or rear end. It's only between about 35-55 MPH (but is loud enough to notice) and is only when my foot is on the gas. Can't tell if it's the driveshaft or rear end. Where do I start?

cookba

iTrader: (10)

history of the 10 bolt would lead me to believe its the rear. check the fluids and add some additive.

nik1703

what kind of additive?

nik1703

bump.

c0ncEpT

iTrader: (4)

Gear noise. Get use to it because it isn't going to go away without a full rear end rebuild.

A few things can cause this. Bearing wear, crush sleeve, ect.

nik1703

Okay, so the other guy mentioned additives, can anyone elaborate on that?

also, whats the possibility its the driveshaft? (I do have an aftermarket aluminum driveshaft)

This noise just came out of no where, fwiw

nik1703

anyone?

bp m1009

iTrader: (2)

chances are if its a new aluminum driveshaft, its balanced and has new u joints. so its not too likely its the shaft. more likely it is the rear, how many miles are on your car? 10 bolt pinion bearings like to wear just enough to loosen the pinion up and cause a new gear mesh on the ring gear, which is what the humming/whining noise your hearing probly is. Its really more of a noise issue not really a threat to breaking.........yet lol

nik1703

unknown miles on the diff, 20k on the motor.

the diff has been beefed up a little. but this noise came out of no where. it went from nothing, to humming/whining.

orangeapeel

iTrader: (18)

Moving to appropriate forum from Internal III.

nik1703

what do yall think of this?

http://www.ws6project.com/user_stor/...oducts_id=2250

O2Form

Humming whining out of no where usually is the pinion nut coming loose but could be other problems.

bp m1009

iTrader: (2)

same thing happened to me, it came out of no where and got progressivly worse. changed the pinion bearings, and all better now...still has some gear noise but no bearing noise

nik1703

How difficult is this? Any DIY's?

346ci

I would not recommend trying to do diff. bearings if it's your first time unless you have some knowledgeable help and a couple tools like a dial indicator and torqometer.

knight721

I used to have the same problem. I checked the fluid in the diferential and it was a little low. went to Autozone and got a posy gear additive (which matched GM's part number) for $5.99. Then top it off (to the hole) with gear oil, and the car feels and sounds a lot better. Some one recommended AMSOIL 75-110w extreme gear oil $15 a bottle, but you have to order it (3 days at advanced auto parts). Hopefully this helps.

nik1703

Great, thanks man. I will try this after work today.

Do I need anything special to get the top filler nut off?

nik1703

well guys, i threw a whole tube of additive in the diff and it didnt do a damn thing

bp m1009

iTrader: (2)

is there a vibration on the highway or anything? any vibrations at certain throttle applications only? does it get faster or louder with speed?

nik1703

gets louder with speed between 30-60, but then it completely disappears around 80. now i have kind of a "wom wom wom" noise on decell in 2nd gear when coming to a stop. (whether or not 2nd is engaged)