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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 918 (Automatic Transmission Service, Removal & Installation - 4L60-E) >> Repair Instructions >> 2-4 Servo >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  2. Support the transmission with a suitable jack.
  3. Remove the transmission support. Refer to TRANSMISSION SUPPORT REPLACEMENT (RWD) or TRANSMISSION SUPPORT REPLACEMENT (4WD) in Frame and Underbody.
  4. Remove the exhaust manifold pipe. Refer to EXHAUST MANIFOLD PIPE REPLACEMENT in Engine Exhaust.
    Fig 1: Installing Servo Cover Depressor To Oil Pan Rail
    G01979982Courtesy of GENERAL MOTORS CORP.
  5. Place a drain pan under the vehicle.
  6. Lower the transmission just enough to gain access to the oil cooler lines.
  7. Disconnect the oil cooler lines, if necessary, to gain access to the 2-4 servo. Refer to TRANSMISSION FLUID COOLER HOSE/PIPE REPLACEMENT .
  8. Remove the oil pan bolt below and to the left of the 2-4 servo cover.
  9. Install the J 29714-A to the oil pan rail. 
  10. Tighten the bolt on the J 29714-A in order to compress the servo cover. 
  11. Remove the servo cover retaining ring.
  12. Loosen the bolt on the J 29714-A  to release tension on the servo cover.
    Fig 2: Servo Cover Retaining Ring
    G01979983Courtesy of GENERAL MOTORS CORP.
  13. Remove the servo cover and O-ring seal. If the cover is hung up on the seal, use a pick (2) to pull and stretch the seal (1) out of the groove. Cut and remove the O-ring seal before removing the cover.
    Fig 3: Servo Cover & O-Ring Seal
    G01979984Courtesy of GENERAL MOTORS CORP.
  14. Remove the 2-4 servo assembly from the transmission.
  15. Inspect the 4th apply piston, the 2-4 servo converter, 2nd apply piston, and the piston inner housing for the following defects:
    • Cracks
    • Scoring
    • Burrs and nicks
      Fig 4: 2-4 Servo Assembly
      G01979985Courtesy of GENERAL MOTORS CORP.
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