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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 834 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Repair Instructions >> Pressure Regulator Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Yukon XL, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. 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
  3. Install the pre-assembled parts into the pump bore.
    Fig 1: Installing Reverse Boost Valve Cylinder & Components
    G02112248Courtesy of GENERAL MOTORS CORP.
  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.

  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  .
    Fig 2: Installing Reverse Boost Valve Bushing Retainer Ring
    G02112249Courtesy of GENERAL MOTORS CORP.
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