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Chevrolet Silverado / GMC Sierra. Manual - part 1018
Converter seal bushing moved forward and damaged
Converter seal garter spring missing from the seal
Porous casting of the transmission case or the oil pump
Leak at the Vent Pipe or the Fluid Fill Tube
Overfilled system
Water or coolant in the fluid-the fluid will appear milky.
Transmission case porous
Incorrect fluid level indicator
Plugged vent
Drain-back holes plugged
Mispositioned oil pump to case gasket, if equipped
ISS or ISS plug loose
ISS O-Ring cut or damaged
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Fig. 4: Leak Inspection Points
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
1
Wiring Harness Pass-Through Connector O-ring Seal
2
Transmission Vent Assembly
3
Converter Housing to Case Joint (Pump to Case Oil Seal)
4
Line Pressure Plug
5
Case Extension to Case Seal
6
Manual Shaft Seal
7
Case Extension Oil Seal Assembly
8
Torque Converter Assembly
9
Pump to Case Oil Seal
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
CASE POROSITY REPAIR
Some external leaks are caused by case porosity in non-pressurized areas. You can usually repair
these leaks with the transmission in the vehicle.
1. Thoroughly clean the area to be repaired with a cleaning solvent. Air dry the area.
2. Using instructions from the manufacturer, mix a sufficient amount of an epoxy to make the
repair.
3. While the transmission case is still hot, apply the epoxy. You can use a clean, dry soldering
acid brush to clean the area and also to apply the epoxy cement. Make certain that the area
to be repaired is fully covered.
4. Allow the epoxy cement to cure for three hours before starting the engine.
5. Repeat the fluid leak diagnosis procedures.
SHIFT SOLENOID LEAK TEST
Special Tools
J 35616 GM Terminal Test Kit
J 44246 Solenoid Testing Kit. See Special Tools.
LEAK TEST PROCEDURE
10
Pump Oil Seal Assembly
11
Internal Transmission Speed Sensor to Case O-ring Seal - Some Models
12
2-4 Servo Cover O-ring Seal
13
Oil Fill Tube Seal
14
Oil Cooler Pipe Connectors
15
Transmission Case
16
Transmission Oil Pan Gasket
CAUTION: Epoxy adhesive may cause skin irritations and eye
damage. Read and follow all information on the container
label as provided by the manufacturer.
IMPORTANT:
This procedure tests On/Off type solenoid valves.
Visually inspect the physical condition of the solenoid
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
1. Remove the shift solenoid valve from the control valve body or the torque converter clutch
(TCC) solenoid valve from the transmission case. Refer to Control and Shift Solenoids
Replacement or Torque Converter Clutch Pulse Width Modulation Solenoid,
Torque Converter Clutch Solenoid, and Wiring Harness.
Fig. 5: Installing Valve Into Bore No. 2 Of J 44246
Courtesy of GENERAL MOTORS CORP.
before testing. Inspect the O-rings before and after the
test to be sure that they are not cut or damaged.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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