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Chevrolet Equinox Service Manual: #99-04-20-002H: Information on Driveline Clunk Noise - (Apr 11, 2013)

Chevrolet Equinox Service Manual / Powertrain / Driveline / #99-04-20-002H: Information on Driveline Clunk Noise - (Apr 11, 2013)

Subject:Information on Driveline Clunk Noise

#99-04-20-002H: Information on Driveline Clunk Noise - (Apr 11, 2013)

Models: 2014 and Prior GM Passenger Cars and Light Duty Trucks

This bulletin is being revised to add the 2013-2014 model years. Please discard CorporateBulletin Number-99-04-20-002G (Section 04 – Driveline/Axle).

Important:The condition described in this bulletin should not be confused with the followingprevious bulletins:

Clunk, Bump or Squawk when Vehicle Comes to Complete Stop or Accelerating from CompleteStop (Replace Rear Drive Shaft Nickel-Plated Slip Yoke) (Corporate Bulletin Number-01-04-17-004Bor later)Clunk Noise at Stop or From Launch (Clean/Lubricate Rear Propshaft Slip Yoke Splines)(Corporate Bulletin Number- 09-04-21-003D or later)Bump Feel/Clunk Noise at Stop or From Launch (Clean/Lubricate Propeller Shaft SlipYoke Splines) (Corporate Bulletin Number-09-04-17-002E or later)

Some customers of vehicles equipped with automatic transmissions may comment thatthe vehicle exhibits a clunk noise when shifting between Park and Drive, Park andReverse, or Drive and Reverse. Similarly, customers of vehicles equipped with automaticor manual transmissions may comment that the vehicle exhibits a clunk noise whiledriving when the accelerator is quickly depressed and then released. Tipping intothe throttle after decelerationcan also result in some level of clunk as the driveline is loaded in one direction(coast) then with throttle reapply the driveline gets loaded in the opposite direction(drive). On manual transmission vehicles depressing the clutch while in a decelerationimmediately releases load on the driveline and may produce a clunk noise as the drivelineunloads.

Note:Compare this complaint vehicle to a like vehicle. If the results are the same, thisis a normal condition. For additional diagnostic information, refer to the appropriateService information.

Whenever there are two or more gears interacting with one another, there must be acertain amount of clearance between those gears in order for the gears to operateproperly. This clearance or freeplay (also known as lash) can translate into a clunknoise whenever the gear is loaded and unloaded quickly, or whenever the directionof rotation is reversed. The more gears you have in a system, the more freeplay thetotal 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 driveor all-wheel drive vehicle than a 2-wheel drive vehicle. This is because in additionto 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 associatedclearances) add additional freeplay to the driveline.

In service, dealers are discouraged from attempting to repair driveline clunk conditionsfor the following reasons:

Comments of driveline clunk are almost never the result of one individual componentwith 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 adverselyaffect durability or performance.For additional diagnostic information, refer to the appropriate Service Information.

GM bulletins are intended for use by professional technicians,NOT a "do-it-yourselfer".  They are written to inform thesetechnicians of conditions that may occur on some vehicles, or toprovide information that could assist in the proper service of avehicle.  Properly trained technicians have the equipment,tools, safety instructions, and know-how to do a job properly andsafely.  If a condition is described, DO NOT assume that thebulletin applies to your vehicle, or that your vehicle will havethat condition.  See your GM dealer for information on whetheryour vehicle may benefit from the information.

#99-04-20-002H: Information on Driveline Clunk Noise - (Apr 11, 2013)


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