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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1007 (Automatic Transmission - 4L80-E/4L85-E (Introduction, Service & Replacement)) >> Repair Instructions >> Pressure Regulator Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and suitably support the vehicle. Refer toLifting and Jacking the Vehicle in General Information.
  2. Remove the transmission filter. Refer to Automatic Transmission Fluid/Filter Replacement .
    3. CAUTION: Valve springs can be tightly compressed. Use care when removing retainers and plugs. Personal injury could result.
    Fig 1: View Of Valve Bore Plug Retainer Ring & Reverse Boost Valve Bushing Retainer Ring
    GM102558Courtesy of GENERAL MOTORS CORP.
  3. Remove the reverse boost valve bushing retainer ring (2).
  4. Remove the following from the reverse boost valve cylinder:
    • The reverse boost valve bushing
    • The reverse boost valve
    • The pressure regulator spring retainer
    • The pressure regulator spring
    • The pressure regulator valve
    • The reverse boost valve bushing
    Fig 2: Reverse Boost Valve Assembly
    GM43318Courtesy of GENERAL MOTORS CORP.
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