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July 23, 2018 Service bulletin

Power train: automatic transmission: torque converter

Chevrolet technical service bulletin PIP4681E for 2008-2011 Chevrolet Silverado 1500, 2008-2013 Chevrolet Tahoe and 2008-2010 GMC Sierra 1500 and others.

Bulletin number
PIP4681E
Component
Power train: automatic transmission: torque converter
Summary
This Preliminary Information communication provides information to the technician about vehicles that have a random bump, chuggle, or fishbite sensation when crowding the throttle slightly with the Torque Converter Clutch on while cruising at 35-60 miles per hour. Technician should follow all published Service Information diagnostics if the concern is repaired compare to a like vehicle with the same options.

Owners of these vehicles have filed 300 complaints in the transmission category.

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