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January 1, 2004 Service bulletin

Allison LCT1000 oil pump whine, buzz on cold start

Chevrolet technical service bulletin 00856 for 2001-2004 Chevrolet Silverado and 2001-2004 GMC Sierra.

Bulletin number
00856
Component
Power train: automatic transmission
Summary
Allison lct1000 oil pump whine, buzz on cold start. Tt

Owners of these vehicles have filed 343 complaints in the transmission category.

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