2001 Suburban Rear Diff Noise

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2001 Suburban Rear Diff Noise

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2001 Suburban Rear Diff Noise - 1/12/2007 11:27:57 AM

cc2006_1973

Posts: 1
Joined: 1/12/2007
Status: offline

Need some guidence on how to fix my problem. About 6 months ago, I noticed a high whine coming from underneth the vehicle, around the rear diff area. The high whine has progressively gotten louder to the point that I needed to do something about it. I did some reading on other forums and though that the problem might be solved by changing out the rear diff fluid. I changed out the fluid with 75/90 synthetic oil which was recommended by the service guys at my local chevy dealership. Well, that didn't work. The high whine is still there. I looked under the vehicle again to see if I was mistaken about where the noise was coming from and determined that it is coming from the rear diff. What do you experts think my problem could be? Can this be something that I can fix myself or will I have to take it to the dealership to get it fixed? I am willing to do the job myself if it can be done.

Post #: 1

RE: 2001 Suburban Rear Diff Noise - 1/13/2007 12:45:14 AM

engine2

Posts: 1707
Joined: 12/24/2006
Status: offline

Do you have the G80 (locking rear differential)? I believe there is a GM additive that is supposed to be added. Most any GM parts guy will know the technical name for the additive. All I know it that it comes in a 4 ounce bottle. Good Luck

(in reply to cc2006_1973)

Post #: 2

RE: 2001 Suburban Rear Diff Noise - 1/13/2007 8:15:30 AM

golfer

Posts: 610
Joined: 10/8/2006
Status: offline

quote:

ORIGINAL: cc2006_1973

Need some guidence on how to fix my problem. About 6 months ago, I noticed a high whine coming from underneth the vehicle, around the rear diff area. The high whine has progressively gotten louder to the point that I needed to do something about it. I did some reading on other forums and though that the problem might be solved by changing out the rear diff fluid. I changed out the fluid with 75/90 synthetic oil which was recommended by the service guys at my local chevy dealership. Well, that didn't work. The high whine is still there. I looked under the vehicle again to see if I was mistaken about where the noise was coming from and determined that it is coming from the rear diff. What do you experts think my problem could be? Can this be something that I can fix myself or will I have to take it to the dealership to get it fixed? I am willing to do the job myself if it can be done.

Not sure what you mean by looking under the vehicle to see if the noise was still there. Unless you had the rear jacked up and with the wheels off the ground and in drive spinning them.

In which case was the sound coming from the front of the diff. ?

You could have problems with the u-joint or the pinion or axle bearings.

(in reply to cc2006_1973)

Post #: 3

RE: 2001 Suburban Rear Diff Noise - 1/13/2007 3:35:49 PM

SLJ2137694

Posts: 68
Joined: 4/30/2006
Status: offline

If you have a whine that get louder and higher pitched the faster you go, sort of like a siren, it may be pinion bearings. Differential additive has nothing to do with this complaint and it is very probable that the differential lube you installed already had the additive in it. Check the container for that information. This is a long shot but I have personally seen abnormal tire tread wear set up noises that you would think were a mechanical noise so check your tires.

_____________________________

Steven L Jones
Retired and Loving It!!!
33 years with General Motors Product Service Engineering.
A.S.E. Certified

(in reply to golfer)

Post #: 4

RE: 2001 Suburban Rear Diff Noise - 8/3/2007 7:28:18 PM

rzc

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Joined: 8/3/2007
Status: offline

I have no clue about Suburbans, my wife just got a 01 from her parents. Yesterday I noticed when you first start the car it's sound OK but after driving around town when we are on a stop I can hear a high pitch whinning noise? Should I be concerned?

_____________________________

2001 Suburban LT 5.3 V8
151,000 plus miles and going

(in reply to SLJ2137694)

Post #: 5

RE: 2001 Suburban Rear Diff Noise - 8/3/2007 10:08:16 PM

RonH

Posts: 418
Joined: 1/31/2007
Status: offline

quote:

ORIGINAL: rzc

I have no clue about Suburbans, my wife just got a 01 from her parents. Yesterday I noticed when you first start the car it's sound OK but after driving around town when we are on a stop I can hear a high pitch whinning noise? Should I be concerned?

If you are saying the whining can be heard coming from the rear of the vehicle when you are stopped, it's probably the fuel pump. Some of them can be really loud.

< Message edited by RonH -- 8/3/2007 10:09:13 PM >

(in reply to rzc)

Post #: 6