Sierra 3500 4WD V8-6.6L DSL Turbo (2007)
Transmission Cooler: Customer Interest
A/T - Transmission Oil Cooler Line Leak
TECHNICAL
Bulletin No.: 08-07-30-049B
Date: April 19, 2011
Subject: Transmission Fluid Cooler Line Leak (Replace Affected Cooler Line)
Models:
2006-2007 Chevrolet Silverado Classic 2500/3500 Series
2007-2009 Chevrolet Silverado 2500/3500 Series
2006-2007 GMC Sierra Classic 2500/3500 Series
2007-2009 GMC Sierra 2500/3500 Series
Equipped with 6.6L Diesel Engine (VINs D, 2, 6 - RPOs LBZ, LLY, LMM)
and Built Prior to April 01, 2009
Supercede:
This bulletin is being revised to update the Parts Information and provide a build date. Please discard Corporate Bulletin Number 08-07-30-049A
(Section 07 - Transmission/Transaxle).
Condition
Some customers may comment on a transmission fluid leak. This concern will be more prevalent in extreme cold climates.
Further inspection may find that the leak is coming from one of the transmission cooler lines at the hose to steel line crimp.
Correction
If the under vehicle inspection reveals transmission fluid leaking from one of the cooler lines, replace the affected cooler line. New transmission cooler
lines have been released to address this concern. These new lines have been manufactured with an updated crimp process to better withstand the cold
temperatures. Refer to SI for the replacement procedures.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
