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Service bulletin 14308A

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10057635
Published by NHTSA2015-06-16
Manufacturer's number14308A
Manufacturer's date2015-03-01
NHTSA componentPOWER TRAIN:MANUAL TRANSMISSION:LUBRICANT

NHTSA's summary

GENERAL MOTORS 2008 CHEVROLET SILVERADO HD DIESEL: TSB CONTAINS AN OWNER NOTIFICATION LETTER. SELECT DOCUMENT SEARCH BUTTON BELOW. GMC SIERRA HD DIESEL: EQUIPPED WITH ALLISON 6 SPEED AUTOMATIC TRANSMISSION. TRANSMISSION OIL COOLER LINE FLUID LEAK. *LJ

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Transmission and driveline, Manual transmission

Vehicles listed
CHEVROLET SILVERADO2008

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
030729004L2019-05-20. Service bulletin. This informational bulletin provides normal operating characteristics and diagnostic information on Manual transmissions.
09-07-30-004J2018-05-29. Service bulletin. This technical bulletin provides a procedure to install a 3-5-rev clutch housing inspection and repair to correct the customers concern of Slips in Reverse or Third, Delayed Reverse or Drive Engagement and MIL on.
03-07-29-004J2018-05-21. Service bulletin. This informational bulletin provides technicians with information to assist in identifying operating characteristics of manual transmissions that repair attempts will not change.
SB-03-07-29-004K2016-08-06. Service bulletin. THIS INFORMATIONAL BULLETIN PROVIDE INFORMATION ON THE OPERATING CHARACTERISTICS OF A MANUAL TRANSMISSION.
PI-02982011-05-23. Service bulletin. GM: WHEN DRIVING UPHILL THE TRANSMISSION MAY NOT SHIFT OUT OF FIRST OR WILL SLIP INTO SECOND GEAR DUE TO A TORN CLUTCH SEAL. THERE MAY BE TWO INTERNAL TROUBLE CODES STORED. *RM
PIP43042008-04-07. Service bulletin. DTC P0878, P2714, P2723, TRANSMISSION SLIPS IN 1ST, 2ND, 3RD, OR 4TH GEARS AND/OR LONG GARAGE SHIFTS TO DRIVE, EQUIPPED WITH A 6L50 (MYB), 6L80 (MYC), OR 6L90 (MYD) TRANSMISSION. *NJ
31362007-02-22. Service bulletin. SLIP CONDITION IN 2ND, 3RD, OR 4TH. DAMAGED 2-4 OR 3-4 CLUTCH. *KB UPDATED 10/31/07. *NJ