2001 Suburban Rear Diff Noise (Full Version)

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2001 Suburban Rear Diff Noise

cc2006_1973 -> 2001 Suburban Rear Diff Noise (1/12/2007 11:27:57 AM)
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.

engine2 -> RE: 2001 Suburban Rear Diff Noise (1/13/2007 12:45:14 AM)
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

golfer -> RE: 2001 Suburban Rear Diff Noise (1/13/2007 8:15:30 AM)
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.

SLJ2137694 -> RE: 2001 Suburban Rear Diff Noise (1/13/2007 3:35:49 PM)
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.

rzc -> RE: 2001 Suburban Rear Diff Noise (8/3/2007 7:28:18 PM)
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?

RonH -> RE: 2001 Suburban Rear Diff Noise (8/3/2007 10:08:16 PM)
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.

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