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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Automatic Transaxle Overhaul & Testing - 4T65-E) >> Transaxle Disassembly >> Control Valve Body, Oil Pump & Vehicle Speed Sensor

Control Valve Body, Oil Pump & Vehicle Speed Sensor

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  1. Position transaxle with control valve body cover facing up. Remove case side cover (control valve body cover) bolts. See Fig 1. Remove cover and gaskets. See Figure. Using small screwdriver, pry wiring harness electrical connectors off transaxle fluid pressure manual valve position switch, 1-2 and 3-4 shift solenoid, 2-3 shift solenoid, TCC PWM solenoid, pressure control solenoid and input speed sensor. Gently pull transaxle fluid temperature sensor from clip. See Fig 2 and Fig 3 .
  2. Lift wiring harness assembly off transaxle. Remove oil pump assembly bolts. DO NOT remove No. 1 oil pump cover bolt at this time. See Fig 4. Remove wiring harness clip. Lift oil pump assembly off control valve body. See Fig 5. Set oil pump assembly on its cover.
  3. Remove control valve body bolts. See Fig 6. Manual valve position switch is very delicate, use care when handling. Carefully lift manual valve position switch off control valve body. See Fig 7. Remove control valve body. See Fig 8. Remove 4 check balls from case cover. See Fig 9. Remove 2 bolts retaining spacer plate and gaskets to valve body. Remove spacer plate with 2 screen/seal assemblies and gaskets from valve body. Remove 6 check balls from valve body. See Fig 10. Remove case cover pin.
  4. Remove oil pump drive shaft from case cover. See Fig 11. Position transaxle so Vehicle Speed Sensor (VSS) is facing up. Remove VSS bolt and VSS. See Figure.
Fig 1: Identifying Case Side Cover Bolt Locations
G00057584Courtesy of GENERAL MOTORS CORP.
Fig 2: Routing Transaxle Wire Harness
G98F01969Courtesy of GENERAL MOTORS CORP.
Fig 3: Identifying Transaxle Electronic Component Locations
G99J03625Courtesy of GENERAL MOTORS CORP.
Fig 4: Identifying Oil Pump Bolt Locations
G00031969Courtesy of GENERAL MOTORS CORP.
Fig 5: Removing & Installing Oil Pump Assembly
G00057603Courtesy of GENERAL MOTORS CORP.
Fig 6: Identifying Valve Body Bolt Locations
G00031970Courtesy of GENERAL MOTORS CORP.
Fig 7: Removing & Installing Manual Valve Position Switch
G00057604Courtesy of GENERAL MOTORS CORP.
Fig 8: Removing Control Valve Body Assembly
G00057605Courtesy of GENERAL MOTORS CORP.
Fig 9: Locating Case Cover Check Balls
G98B01972Courtesy of GENERAL MOTORS CORP.
Fig 10: Locating Control Valve Body Check Balls
G98A01882Courtesy of GENERAL MOTORS CORP.
Fig 11: Removing & Installing Oil Pump Drive Shaft
G00057606Courtesy of GENERAL MOTORS CORP.
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