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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 52 (Transfer Case - NVG 149-NP3 - Overhaul) >> Repair Instructions >> Cleaning and Inspection >> Viscous Coupling

Viscous Coupling

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  1. Inspect the viscous coupling for a bulged rear cover (1). The rear cover should be flat (2).
    Fig 1: Viscous Coupling Inspection Area
    GM805650Courtesy of GENERAL MOTORS CORP.
  2. Replace the viscous coupling if the rear cover is bulged.