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96 - 05 light-duty trucks, passenger cars, and utilities equipped with the 4L60E (M30) and 4L65E (M32) automatic transmissions may experience a single snap noise during a 2-1 downshift when coming to a stop.
The snap noise should not be confused with a stop clunk as it is a snap. The snap noise may be described as a ball peen hammer hitting the transmission case. The noise may also be present when shifting from reverse to drive or drive to reverse. The snap noise may appear to be coming from the transfer case.
POSSIBLE CAUSE -The Low and Reverse Clutch Support Retainer Spring (anti-clunk spring) (item 680) may have been bent during the production process or during an overhaul at the dealer. The noise will most likely occur at low mileage (0 to 7500).
The Low and Reverse Clutch Support Retainer Spring (item 680) should be inspected for being bent. If damaged, the retainer spring should be replaced.
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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.
(96-05 All GM Light Duty Trucks and Cars equipped with the 4L60E M30 and 4L65E M32)
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GM bulletins are intended for use by professional technicians,
NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to
provide information that could assist in the proper service of a
vehicle. Properly trained technicians have the equipment,
tools, safety instructions, and know-how to do a job properly and
safely. If a condition is described, DO NOT assume that the
bulletin applies to your vehicle, or that your vehicle will have
that condition. See your GM dealer for information on whether
your vehicle may benefit from the information. |
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