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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Transfer Case - BW 4473-NP3) >> Repair Instructions - Off Vehicle >> Cleaning and Inspection >> Viscous Coupling

Viscous Coupling

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    Fig 1: Inspection Areas On Viscous Coupling
    GM823251Courtesy of GENERAL MOTORS CORP.
  1. Inspect the viscous coupling for leaking at the ball (1) in the housing. A black liquid would be visible if it is leaking.
  2. Replace the viscous coupling if it is leaking.
  3. Inspect for excessive worn splines (2).
  4. Replace the viscous coupling if the splines are faulty.
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