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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 >> Countershaft Assembly 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. Use a J 37271  and a torque wrench to measure the countershaft drive pinion bearing preload (countershaft starting torque) before disassembly.
    • Place the countershaft drive pinion (1) in a soft jaw vise and turn the countershaft front lock nut with a J 37271  and a torque wrench.
    • The countershaft requires approximately 0.6-1.0 N.m (5.3-8.8 lb in) to rotate.
    • If the countershaft drive pinion bearing preload does not fall within specification, inspect the countershaft assembly components for excessive wear.
      • Fig 1: Measuring Countershaft Drive Pinion Bearing Preload Using J 37271
      G01384912Courtesy of GENERAL MOTORS CORP.
  2. Remove the underdrive planetary carrier snap ring (2) from the countershaft drive pinion (1).
    Fig 2: Removing Underdrive Planetary Carrier Snap Ring
    G01384913Courtesy of GENERAL MOTORS CORP.
  3. Remove the underdrive planetary carrier (2) from the countershaft drive pinion (1).
    Fig 3: Removing Underdrive Planetary Carrier
    G01384914Courtesy of GENERAL MOTORS CORP.
  4. Remove the underdrive sun gear outer thrust bearing (1) and the race (3) from the countershaft (2).
    Fig 4: Removing Underdrive Sun Gear Outer Thrust Bearing
    G01384915Courtesy of GENERAL MOTORS CORP.
  5. Use the J 37273  with a J 36513  and a hydraulic press (2) to remove the following components from the countershaft:
    • The countershaft front roller bearing inner race
    • The countershaft outer drive pinion bearing
    • The countershaft drive pinion
  6. Remove the crush sleeve from the countershaft.
    Fig 5: View Of J 37273 & J 36513
    G01384916Courtesy of GENERAL MOTORS CORP.
  7. Remove the following components from the underdrive planetary ring gear flange on the countershaft:
    • The underdrive planetary ring gear snap ring (1)
    • The underdrive planetary ring gear (2)
    Fig 6: Removing Underdrive Planetary Ring Gear Snap Ring
    G01384917Courtesy of GENERAL MOTORS CORP.
  8. Use the J 37273  with a J 22912-01  and a hydraulic press (2) to remove the countershaft inner drive pinion bearing (1) from the countershaft.
    Fig 7: View Of J 37273 & J 22912-01
    G01384918Courtesy of GENERAL MOTORS CORP.
  9. Use a standard drift punch and a hammer to remove the countershaft inner drive pinion bearing race (2) from the countershaft drive pinion.
    Fig 8: Removing Countershaft Inner Drive Pinion Bearing Race Using Drift Punch & Hammer
    G01384919Courtesy of GENERAL MOTORS CORP.
  10. Use a standard drift punch and a hammer to remove the countershaft outer drive pinion bearing race (1) from the countershaft drive pinion (2).
    Fig 9: Removing Countershaft Outer Drive Pinion Bearing Race Using Drift Punch & Hammer
    G01384920Courtesy of GENERAL MOTORS CORP.
  11. Clean all countershaft assembly components and dry thoroughly.
  12. Inspect all countershaft assembly bearings and races for rough operation, excessive wear or damage and replace as necessary.
  13. Inspect the countershaft drive pinion gear and parking gear for chipped or broken teeth, excessive wear or damage. Replace the countershaft drive pinion as necessary.
  14. Inspect the following components for excessive wear or damage and replace as necessary:
    • The underdrive planetary ring gear
    • The underdrive planetary carrier
    • The underdrive sun gear
  15. Use the J 26900-6  to measure the underdrive sun gear flange bushing inside diameter.
    • The standard underdrive sun gear flange inside diameter should fall within 29.800 to 29.825 mm (1.1735 to 1.1742 in).
    • The maximum sun gear flange bushing inside diameter is 29.870 mm (1.1760 in).
    • If the underdrive sun gear flange bushing inside diameter is greater than specified, replace the underdrive sun gear (3).
    Fig 10: Measuring Underdrive Sun Gear Flange Inside Diameter Using J 26900-6
    G01384921Courtesy of GENERAL MOTORS CORP.
  16. Use a feeler gage (2) to measure the underdrive planetary carrier pinion gear (1) thrust clearance.
    • Standard underdrive planetary carrier pinion gear thrust clearance should fall within 0.20 to 0.50 mm (0008 to 0.020 in).
    • If the underdrive planetary carrier pinion gear thrust clearance is greater than 0.50 mm (0.020 in), replace the underdrive planetary carrier.
    Fig 11: Measuring Underdrive Planetary Carrier Pinion Gear Thrust Clearance Using Feeler Gage
    G01384922Courtesy of GENERAL MOTORS CORP.
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