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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1781 (Automatic Transmission Overhaul - 4 Speed-Mu4) >> Repair Instructions >> Intermediate One-Way Clutch Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the intermediate one-way clutch before disassembly by placing the intermediate brake hub and the intermediate one-way clutch onto the rear of the sun gear input drum, holding the sun gear input drum stationary and rotating the intermediate brake hub.
    • The intermediate brake hub should turn freely in a clockwise direction (2) and should not turn in a counterclockwise direction (4).
    • If the intermediate brake hub is installed correctly on the sun gear input drum and the intermediate brake hub can be turned counterclockwise, replace the intermediate brake hub and intermediate one-way clutch
    Fig 1: Checking Intermediate Brake Hub Rotation
    G01384895Courtesy of GENERAL MOTORS CORP.
    NOTE: The intermediate one-way clutch should be disassembled for inspection purposes only. If excessive wear or damage is found in any component of the intermediate one-way clutch upon inspection, replace the intermediate brake hub assembly.
  2. Remove the rear thrust plate from the intermediate brake hub (1).
    Fig 2: Removing Rear Thrust Plate From Intermediate Brake Hub
    G01384896Courtesy of GENERAL MOTORS CORP.
  3. Remove the intermediate one-way clutch retainers and the sprag assembly from the intermediate brake hub (4).
    Fig 3: Removing Intermediate One-Way Clutch Retainers & Sprag Assembly
    G01384897Courtesy of GENERAL MOTORS CORP.
  4. Remove the front planetary ring gear flange snap ring (1) from the front planetary ring gear.
    Fig 4: Removing Front Planetary Ring Gear Flange Snap Ring
    G01384898Courtesy of GENERAL MOTORS CORP.
  5. Remove the front planetary ring gear flange (2) from the front planetary ring gear (1).
    Fig 5: Removing Front Planetary Ring Gear Flange
    G01384899Courtesy of GENERAL MOTORS CORP.
  6. Remove the sun gear input drum snap ring (2) from the sun gear at the rear of the sun gear input drum.
  7. Remove the sun gear (1) from the sun gear input drum (3).
    Fig 6: Removing Sun Gear Input Drum Snap Ring
    G01384900Courtesy of GENERAL MOTORS CORP.
  8. Remove the sun gear snap ring from the sun gear.
  9. Clean all components of the front planetary gearset and the sun gear input and dry these components thoroughly.
  10. Inspect the following components for excessive wear or damage. Replace the intermediate brake hub assembly as necessary:
    • The intermediate one-way clutch outer race
    • The retainers
    • The sprag assembly
  11. Inspect the following components for excessive wear or damage and replace as necessary:
    • The front planetary ring gear
    • The front planetary carrier pinion gears
    • The sun gear
  12. Use a J 26900-6  in order to measure the front planetary ring gear flange bushing inside diameter (2).
    • The standard front planetary ring gear flange bushing inside diameter should fall within 19.025-19.050 mm (0.7490-0.7500 in).
    • If the front planetary ring gear flange bushing inside diameter is greater than 19.050 mm (0.7500 in), replace the front planetary ring gear flange.
    Fig 7: Measuring Front Planetary Ring Gear Flange Bushing Inside Diameter
    G01384901Courtesy of GENERAL MOTORS CORP.
  13. Use the J 26900-6  in order to measure the sun gear flange bushing inside diameter.
    • The standard sun gear flange bushing inside diameter (1) should fall within 22.025-22.046 mm (0.8671-0.8680 in).
    • The maximum sun gear flange bushing inside diameter (2) is 22.096 mm (0.8699 in).
    • If the sun gear flange bushing inside diameter is greater than specified, replace the sun gear.
    Fig 8: Measuring Sun Gear Flange Bushing Inside Diameter Using J 26900-6
    G01384902Courtesy of GENERAL MOTORS CORP.
  14. Use a feeler gage (2) in order to measure the front planetary carrier pinion gear thrust clearance.
    • The standard front planetary carrier pinion gear thrust clearance should fall within 0.20-0.50 mm (0.008-0.020 in).
    • If the front planetary carrier pinion gear thrust clearance is greater than 0.50 mm (0.020 in), replace the front planetary carrier.
    Fig 9: Measuring Front Planetary Carrier Pinion Gear Thrust Clearance
    G01384903Courtesy of GENERAL MOTORS CORP.
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