Transfer Case - Drive Chain And Sprocket Revision
INFORMATIONBulletin No.: 11-04-21-004
Date: February 15, 2011
Subject: Borg Warner Transfer Case Drive Chain and Sprocket Revision
Models:
2004-2006 Cadillac Escalade, Escalade ESV, Escalade EXT
2004-2006 GMC Yukon Denali
Equipped with 4WD and Transfer Case RPO NR3
2003-2005 Chevrolet Suburban, Tahoe
2003-2005 GMC Yukon
Equipped with 4WD and Transfer Case RPO NR4
Production assemblies were built with the 1.25 inch parts. The new service assemblies built effective 12/20/10 (and the SN breakpoint below) are built using the 1.50 inch parts.
Service parts have revised the component usage and parts release strategy to make ONLY the 1.50 inch parts available. If replacement of a 1.25 inch drive sprocket, driven sprocket or chain is required, all must be replaced using the 1.50 inch components.
To determine the design level of the components within the assembly, measure the width of the drive sprocket teeth.
Borg Warner 4481/4482 transfer case service assemblies will include a revised design drive sprocket (25), driven sprocket (38) and drive chain (26). The new design drive sprockets and chain are 38.1 mm (1.50 in) width design. The earlier components were a 31.75 mm (1.25 in) width design. Service assemblies built after the 60DBC070376 (44-81 1 Speed, AWD) or 60CZC014106 (44-82 2 Speed, AWD) serial number breakpoint will include the 38.1 mm (1.50 in) design components. If replacement of the drive sprockets or chain is required on an earlier design assembly with 31.75 mm (1.25 in) components, the drive sprocket, driven sprocket and chain all must be replaced with the 38.1 mm (1.50 in) components. The 38.1 mm (1.50 in) design components will be the only design available for service.
38.1 mm (1.50")
31.75 mm (1.25")
To determine the design level of the components within the assembly, measure the width of the drive sprocket teeth.
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