2000 tahoe lt 4x4
August 26th, 2006, 11:29 AM
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2000 tahoe lt 4x4
I was finally able to buy a tahoe. I just got this one with 40 thousand miles on it. Looks like new. Thing is when i shift it into reverse it makes a loud clunking noise. I thought it was the U-joints. Took it back as its under warrenty and they said its a common noise in the transfer case and its normal.........? Is that true? Anyone else have this noise? my fuel pump makes a loud whining noise as well that they said is normal? I think they are scamming me thats why im here. Anyone have any ideas? Thanks
August 26th, 2006, 12:30 PM
#2
RE: 2000 tahoe lt 4x4
Below is a copy of GM’s TSB 99-04-20-002C which addresses your concern.
Noisy fuel pumps are very common and do not require servicing, these are large high pressure/high volume units and they can get noisy, most of the time these units will run for years without a problem even though they appear to be abnormally loud.
Noisy fuel pumps are very common and do not require servicing, these are large high pressure/high volume units and they can get noisy, most of the time these units will run for years without a problem even though they appear to be abnormally loud.
Some owners of vehicles equipped with automatic transmissions may comment that the vehicle exhibits a clunk noise when shifting between Park and Drive, Park and Reverse, or Drive and Reverse. Similarly, owners of vehicles equipped with automatic or manual transmissions may comment that the vehicle exhibits a clunk noise while driving when the accelerator is quickly depressed and then released.
Whenever there are two or more gears interacting with one another, there must be a certain amount of clearance between those gears in order for the gears to operate properly. This clearance or freeplay (also known as lash) can translate into a clunk noise whenever the gear is loaded and unloaded quickly, or whenever the direction of rotation is reversed. The more gears you have in a system, the more freeplay the total system will have.
The clunk noise that owners sometimes hear may be the result of a buildup of freeplay (lash) between the components in the driveline.
For example, the potential for a driveline clunk would be greater in a 4-wheel drive or all-wheel drive vehicle than a 2-wheel drive vehicle. This is because in addition to the freeplay from the rear axle gears, the universal joints, and the transmission (common to both vehicles), the 4-wheel drive transfer case gears (and their associated clearances) add additional freeplay to the driveline.
In service, dealers are discouraged from attempting to repair driveline clunk conditions for the following reasons:
• Comments of driveline clunk are almost never the result of one individual component with excessive lash, but rather the result of the added affect of freeplay (or lash) present in all of the driveline components.
Because all of the components in the driveline have a certain amount of lash by design, changing driveline components may not result in a satisfactory lash reduction.
• While some owners may find the clunk noise objectionable, this will not adversely affect durability or performance.
• For additional diagnostic information, refer to the appropriate Service Information.
Whenever there are two or more gears interacting with one another, there must be a certain amount of clearance between those gears in order for the gears to operate properly. This clearance or freeplay (also known as lash) can translate into a clunk noise whenever the gear is loaded and unloaded quickly, or whenever the direction of rotation is reversed. The more gears you have in a system, the more freeplay the total system will have.
The clunk noise that owners sometimes hear may be the result of a buildup of freeplay (lash) between the components in the driveline.
For example, the potential for a driveline clunk would be greater in a 4-wheel drive or all-wheel drive vehicle than a 2-wheel drive vehicle. This is because in addition to the freeplay from the rear axle gears, the universal joints, and the transmission (common to both vehicles), the 4-wheel drive transfer case gears (and their associated clearances) add additional freeplay to the driveline.
In service, dealers are discouraged from attempting to repair driveline clunk conditions for the following reasons:
• Comments of driveline clunk are almost never the result of one individual component with excessive lash, but rather the result of the added affect of freeplay (or lash) present in all of the driveline components.
Because all of the components in the driveline have a certain amount of lash by design, changing driveline components may not result in a satisfactory lash reduction.
• While some owners may find the clunk noise objectionable, this will not adversely affect durability or performance.
• For additional diagnostic information, refer to the appropriate Service Information.
August 26th, 2006, 1:52 PM
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RE: 2000 tahoe lt 4x4
Cool thanks alot. That helps me out alot. I have also been doing some searching for info on the 5.3 engine. Would that be considered a 327? The tahoe is great and we love it. Just want it too last. Whoever owned it before us took really good care of it. The inside of it looks like no one ever even drove the thing. The salesman said it was a old couple that only used it to tow a camper. Thats why i wondered if the clunking was bad since it was mainly used to tow that thing. Thanks for the help
August 26th, 2006, 2:31 PM
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RE: 2000 tahoe lt 4x4
Yes the 5.3 is a 327. If you think the clunk is unusually loud or bad then it wouldn't hurt to put u-joints on it. It may quiet it down, you should also know that they are not greasable and the towing done by the last owner would put added stress on them. Sometimes when they start to clunk you cannot move them, (how they are checked) but if you put a little grease in them or put new ones in the clunk goes away.
Unless I am wrong their is nothing on your Tahoe that you should be able to grease unless it has already been replaced.
Unless I am wrong their is nothing on your Tahoe that you should be able to grease unless it has already been replaced.
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