2008 silverado transfer case problems
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A transfer case is a part of the drivetrain of four-wheel-drive, all-wheel-drive, and other multiple powered axle vehicles. The transfer case transfers power from the transmission to the front and rear axles by means of drive shafts.
Powered by a 6.6L Duramax V8, the 4x4 used a 5-speed Allison 2000 series in 2005-2006 (replaced by a 6-speed Allison 2350 automatic) with a New Process 273C transfer case. 5.13:1 was the only axle gear ratio offered for 4x4 versions.