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Automatic Transmission - 4L80-E - Servicing: Other Chevrolet Silverado 1500 HD

Automatic Trans 3 illustrations ~492 words

Preparation

  1. After the repair or replacement transmission is installed in the vehicle, DO NOT reconnect the oil cooler pipes.
  2. Remove the fill cap (9) on the Transmission Oil Cooler and Line Flusher (J-35944-A) and fill the flusher tank (4) with 20-21 oz. (0.6L) of flushing solution using the measuring cup (6). DO NOT overfill.
  3. Install the fill cap (9) on the flusher and pressurize the flusher tank (4) to 80-100 psi (550-700 kPa), using the shop air supply at the tank air valve (2). (Scheme 289)
  4. With the water supply valve (1) on the flusher in the OFF position, connect the water supply hose (7) from the flusher to the water supply at the faucet. (Scheme 289)
  5. Turn ON the water supply at the faucet.

Scheme 289

Scheme 289
Scheme 289

ON-VEHICLE REPAIRS

Note. Various components may be serviced without transmission removal, depending on application. For servicing of these components, see appropriate component under ADJUSTMENTS and/or REMOVAL & INSTALLATION . For additional information on testing electrical components, see appropriate DIAGNOSIS article.

PARK/NEUTRAL POSITION SWITCH

Note. Apply the park brake. The engine must start in the Park (P) or Neutral (N) positions only. Check the PNP switch for proper operation.

  1. Place the shift lever in the N position.
  2. With an assistant in the drivers seat, raise and suitably support the vehicle.
  3. Loosen the PNP switch bolts.
  4. With the vehicle in N, rotate the PNP switch while the assistant attempts to start the engine.
  5. Following a successful start, turn the engine OFF.
  6. Tighten the PNP switch bolts. Tighten the bolts to specification. See «TORQUE SPECIFICATIONS»(ref-154137-S39198836352003050600000) .
  7. Lower the vehicle.
  8. Check the PNP switch for proper operation. The engine must start in the P or N positions only.
  9. Replace the PNP switch if proper operation can not be achieved. See «PARK/NEUTRAL POSITION SWITCH»(ref-154137-S19180835892003050600000) under REMOVAL & INSTALLATION.

SHIFT CABLE

  1. Ensure the gearshift lever and the transmission manual shaft lever are in the Park position.
  2. Raise and support the vehicle.
  3. With right hand, push the flange (3) of the cable (transmission end) (5), inside the cable (1) (shifter end) until the connection is made, ensuring the flange ribs (7) align with the cable (shifter end) (1) slots (2). (Scheme 290)
  4. Hold the red security ring (6) with left hand and with right hand, twist the blue rotating lock (4) until it snaps into position.
  5. With left hand, push the red security ring (1) to the right. (Scheme 291)
  6. The red security ring should cover the white (2) marks on the blue rotating lock (3).

Scheme 290

Scheme 290
Scheme 290

Scheme 291

Scheme 291
Scheme 291

ACCUMULATOR HOUSING

Note. Tools required: Valve Body Align Pin (J-25025-5).

EXTENSION HOUSING REAR OIL SEAL

Note. Tools required: Output Shaft Seal Installer (J-41505), Slide Hammer (J-6125-1B), Universal Seal Remover (J-23129) and Transjel(R) (J-36850).

Note. Tools required: Park/Neutral Position Switch Adjustment Tool (J-41364-A).

PRESSURE REGULATOR

Note. Tools required: Transjel(R) (J-36850)

VALVE BODY & PRESSURE SWITCH

Note. Tools required: Transjel(R) (J-36850) and Valve Body Align Pin (J-25025-5).

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