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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 >> Installation Procedure

Installation 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. Install the pressure regulator valve using J 36850  .
  2. Pre-assemble the following parts:
    • The reverse boost valve bushing
    • A new reverse boost valve
    • A new pressure regulator spring retainer
    • The added isolator pressure regulator spring
    • The pressure regulator spring
    Fig 1: Reverse Boost Valve Assembly
    GM43318Courtesy of GENERAL MOTORS CORP.
  3. Install the pre-assembled parts into the pump bore.
  4. Install the reverse boost valve bushing retainer ring while holding the reverse boost valve bushing in place.

    Ensure the retainer ring (2) is in the groove.

    Fig 2: View Of Valve Bore Plug Retainer Ring & Reverse Boost Valve Bushing Retainer Ring
    GM102558Courtesy of GENERAL MOTORS CORP.
  5. Install the transmission filter. Refer to Automatic Transmission Fluid/Filter Replacement .
  6. Fill the transmission to the proper level with Dexron® III transmission fluid. Refer to Transmission Fluid Checking Procedure .
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