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Document ID# 1430424
2003 HUMMER
H2
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<H1>Information on 2-3 Upshift or 3-2 Downshift Clunk Noise #01-07-30-042B -
(01/16/2004)</H1>Information on 2-3 Upshift or 3-2 Downshift Clunk Noise
2004 and Prior Light Duty Trucks</P>
2003-2004 HUMMER H2</P>
with 4L60E or 4L65E Automatic Transmission (RPOs M30, M32)</P>
This bulletin is being revised to add the 2004 model year. Please discard
Corporate Bulletin Number01-07-30-042A (Section 07 -
Transmission/Transaxle).</P>
Some vehicles may exhibit a clunk noise that can be heard on a 2-3 upshift or
a 3-2 downshift.</P>
During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied.
The timing of this shift can cause a momentary torque reversal of the output
shaft that results in a clunk noise. This same torque reversal can also occur on
a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied. This
condition may be worse on a 4-wheel drive vehicle due to the additional
tolerances in the transfer case.</P>
This is a normal condition. No repairs should be attempted.</P>
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<TD align=left width=778><FONT size=1>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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<TD align=middle width=167><FONT size=2>WE SUPPORT VOLUNTARY TECHNICIAN
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Document ID# 1430424
2003 HUMMER
H2
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