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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 998 (Transfer Case - NVG 263-NP1) >> Repair Instructions >> Encoder Motor Sensor 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. Assemble the harness to the NEW encoder with the connector legend "TOP" (1) and the encoder part number facing up.
    2. Fig 1: Connecting Encoder Harness
    GM1361874Courtesy of GENERAL MOTORS CORP.
  2. Assemble the output shaft into the encoder, being sure to align the encoder tab with the groove on the shaft.
  3. Ensure the encoder is seating properly on the output gear.
  4. Place the output shaft/encoder on the casting.
  5. Place the grommet harness on the casting slot, the flat area on the grommet will be facing up.
  6. With the output gear/encoder assembly in hand, carefully align the casting and output gear timing marks (1).
    7. Fig 2: Casting & Output Gear Timing Marks
    GM1361879Courtesy of GENERAL MOTORS CORP.
  7. At the same time, be sure to align the encoder phasing post (1) with the phasing slot (2) in the casting and insert the shaft into the bushing.
    8. Fig 3: Encoder Phasing Post & Phasing Slot
    GM1361877Courtesy of GENERAL MOTORS CORP.
  8. Verify that the output gear and idler are engaged properly.
  9. Seat the harness wires on the casting channel.
  10. Place the shim on the output shaft gear.
  11. Press a NEW seal into the cover.
  12. Install the cover.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  13. Install 2 NEW screws (1) to the casting.

    Tighten:  Tighten the screws to 2 N.m (18 lb in).

  14. Install 2 NEW longer screws (2) to the motor cover.

    Tighten:  Tighten the screws to 3 N.m (26 lb in).

    15. Fig 4: Motor Cover & Casting Screws
    GM1341854Courtesy of GENERAL MOTORS CORP.
  15. Install the encoder motor. Refer to Transfer Case Encoder Motor Replacement .
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