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Chevrolet Silverado / GMC Sierra. Manual - part 1169
Fig. 532: View Of J 21366 Installed On Torque Converter
Courtesy of GENERAL MOTORS CORP.
1. Install the torque converter.
2. Install the J 21366 . See Special Tools.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
HOLDING FIXTURE REMOVAL
Tools Required
J 8763-B Holding Fixture and Base
Removal
Fig. 533: View Of J 8763-B
Courtesy of GENERAL MOTORS CORP.
Remove the transmission from the J 8763-B .
DESCRIPTION & OPERATION
TRANSMISSION GENERAL INFORMATION
How to Use This Section
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
This section provides the following information:
General diagnosis information on transmissions
Procedures for diagnosing the Hydra-matic transmission
When you diagnose any condition of the Hydra-matic transmission, begin with A Diagnostic
Starting Point. This procedure indicates the proper path of diagnosing the transmission by
describing the basic checks. This procedure will then refer you to the locations of specific checks.
After you have determined the cause of a condition, refer to Repair Instructions for repair
procedures. If the faulty component is not serviceable without removing the transmission from the
vehicle, refer to OFF Vehicle repair information.
Basic Knowledge
You must be familiar with some basic electronics in order to use this section of the service
manual. You should also be able to use the following special tools:
A digital multimeter (DMM)
A circuit tester
Jumper wires or leads
A line pressure gage set
Diagnosis
DEFINITIONS AND ABBREVIATIONS
Throttle Positions
Engine Braking
A condition where the engine friction is used to slow the vehicle by manually downshifting
NOTE:
Do not, under any circumstances, attempt to diagnose a powertrain
condition without basic knowledge of this powertrain. If you
perform diagnostic procedures without this basic knowledge, you
may incorrectly diagnose the condition or damage the powertrain
components.
NOTE:
If you probe a wire with a sharp instrument and do not properly seal
the wire afterward, the wire corrodes and an open circuit results.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
during a zero throttle coastdown.
Full Throttle Detent Downshift
A quick apply of the accelerator pedal to its full travel, forcing a downshift.
Heavy Throttle
Approximately 3/4 of accelerator pedal travel (75 percent throttle position).
Light Throttle
Approximately 1/4 of accelerator pedal travel (25 percent throttle position).
Medium Throttle
Approximately 1/2 of accelerator pedal travel (50 percent throttle position).
Minimum Throttle
The least amount of throttle opening required for an upshift.
Wide Open Throttle (WOT)
Full travel of the accelerator pedal (100 percent throttle position).
Zero Throttle Coastdown
A full release of the accelerator pedal while the vehicle is in motion and in drive range.
Shift Condition Definitions
Bump
A sudden and forceful apply of a clutch or a band.
Chuggle
A bucking or jerking. This condition may be most noticeable when the converter clutch is
engaged. It is similar to the feel of towing a trailer.
Delayed
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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