Chevrolet Silverado / GMC Sierra. Service 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