driveshaft humming?
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From: Redondo Beach, CA
driveshaft humming? 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?
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From: Redondo Beach, CA
also, whats the possibility its the driveshaft? (I do have an aftermarket aluminum driveshaft)
This noise just came out of no where, fwiw
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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
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TECH Resident
Joined: Oct 2008
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From: Redondo Beach, CA
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
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.
Thread Starter
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From: Redondo Beach, CA
Thread Starter
TECH Resident
Joined: Oct 2008
Posts: 966
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From: Redondo Beach, CA
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From: Suffolk, V.A.
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.
Thread Starter
TECH Resident
Joined: Oct 2008
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From: Redondo Beach, CA
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.
Great, thanks man. I will try this after work today.
Do I need anything special to get the top filler nut off?
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From: Redondo Beach, CA
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)