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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado: Problems & Solutions 
1497 messages, Last post on Oct 17, 2006 at 8:34 PM
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Is anyone aware of a driveline clunk with 2000 Silverado’s or is it just me? I have an automatic trans. that makes a clunking noise whenever the accelerator is quickly depressed and then released. Is this normal? Any comments are welcome. Thanks Canayjun64 |
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Driveline - Clunk Explanation File In Section: 04 - Driveline Axle Bulletin No.: 99-04-20-002A Date: September, 2001 INFORMATION Subject: Driveline Clunk Models: 2002 and Prior Light Duty Truck Models This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 99-04-20-002 (Section 04 - Driveline/Axle). Important: The condition described in this bulletin should not be confused with Driveline Stop Clunk, described in Corporate Bulletin Number 964101R (Chevrolet 92-265-7A, GMC Truck 91-4A-77, Oldsmobile 47-71-20A, GM of Canada 93-4A-100) or Bump/Clunk Upon Acceleration, described in Corporate Bulletin Number 99-04-21-004. Some owners of light duty trucks 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.
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I'm going to rename this topic since we don't have a topic where problems and possible fixes for Silverado can be discussed. That way people won't have to create individual topics for the variety of problem-type questions that might come up.
PF Flyer
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Thank you for the reply. I felt compelled to post a message purely as a second opinion. The explanation above is the exact same as what my dealer sent me (Fax). My final question to this ... do I need to worry more about it? It seems to me that any mechanical "clunking" noise usually ends up as a repair(s). It just doesn’t sound right. Hell! …even the word clunk sounds awful. Canayjun64
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I have a 2000 Silverado, 4X4, 4.8 liters that has a sticky throttle (kinda anoying)Is there a quick fix for this that I could do myself at home? Thanks....Canayjun64
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Take it to the dealer. They will replace the throttle body. I had this done a month ago and it made a HUGE improvement. I have 30,500 miles on my 2000 with the 5.3 Ryan |
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| They may not replace the throttle body. They may just clean it with carb cleaner really well. There is a TSB on the replacement of the TB but it only covers a certain build range... | |
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is considered normal maintenance so you may very well get charged for it! That was documented by a few posters quite awhile back on this board for those who had the same sticky throttle problem. The TSB suggests a cleaning first ie; routine owner maint. Watch out for this one ! Ray T. |
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Sounds like fluid/air mix from right side when accelerating from stop up to about 30 mph. Not so loud the stereo doesn't cover it, but is sure annoying when I want quiet in the truck. Any ideas or similar complaints? 2000 Silverado Z71, 5.3 L, 3-dr extended cab.
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