vi Copyright © 1996 General Motors Corp.
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AT 500, 1500 SERIES AUTOMATIC TRANSMISSIONS
2–19. TORQUE PATHS THROUGH
TRANSMISSION
a. Converter Operation. . . . . . . . . . . . . . . .2–11
b. Neutral Operation. . . . . . . . . . . . . . . . . .2–11
c. First-Range Operation . . . . . . . . . . . . . .2–12
d. Second-Range Operation . . . . . . . . . . . .2–13
e. Third-Range Operation. . . . . . . . . . . . . .2–14
f. Converter Operation (AT 1500 Series Models)
2–14
g. Lockup Operation
(AT 1500 Series Models) . . . . . . . . . . . .2–14
h. Fourth-Range Operation. . . . . . . . . . . . .2–15
i. Fourth-Range Lockup Operation
(AT 1500 Series Models) . . . . . . . . . . . .2–15
j. Reverse Operation . . . . . . . . . . . . . . . . .2–16
Section 3. PREVENTIVE MAINTENANCE
3–1. SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3–1
3–2. PERIODIC INSPECTION AND CARE . . . 3–1
3–3. IMPORTANCE OF PROPER
TRANSMISSION FLUID LEVEL
a. Effects of Improper Fluid Level. . . . . . . .3–1
b. Foaming and Aerating . . . . . . . . . . . . . . .3–1
3–4. DIPSTICK MARKINGS . . . . . . . . . . . . . . . .3–1
3–5. TRANSMISSION FLUID LEVEL
CHECK PROCEDURE
a. Preparation . . . . . . . . . . . . . . . . . . . . . . . .3–2
b. Cold Check. . . . . . . . . . . . . . . . . . . . . . . .3–3
c. Hot Check. . . . . . . . . . . . . . . . . . . . . . . . .3–3
3–6. KEEPING TRANSMISSION
FLUID CLEAN . . . . . . . . . . . . . . . . . . . . . . .3–3
3–7. TRANSMISSION FLUID
RECOMMENDATIONS
a. Recommended Automatic Transmission
Fluid and Viscosity Grade . . . . . . . . . . . .3–3
3–8. TRANSMISSION FLUID AND FILTER
CHANGE INTERVALS . . . . . . . . . . . . . . . .3–4
3–9. TRANSMISSION FLUID
CONTAMINATION
a. Examine at Fluid Change . . . . . . . . . . . . .3–4
b. Metal Particles . . . . . . . . . . . . . . . . . . . . .3–4
c. Coolant Leakage. . . . . . . . . . . . . . . . . . . .3–4
d. Auxiliary Filter. . . . . . . . . . . . . . . . . . . . .3–4
3–10. TRANSMISSION FLUID AND FILTER
CHANGE PROCEDURES
a. Disassembly . . . . . . . . . . . . . . . . . . . . . . 3–7
b. Assembly . . . . . . . . . . . . . . . . . . . . . . . . 3–7
3–11. BREATHER. . . . . . . . . . . . . . . . . . . . . . . . . 3–8
3–12. LINKAGE
a. Shift Selector Lever and Control
Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . 3–9
b. Mechanical Actuator Adjustment. . . . . . 3–9
c. Other Linkage Adjustments . . . . . . . . . . 3–9
3–13. ADJUSTMENT OF SHIFT POINTS
a. Calibrated on Test Stand or in Vehicle. . . 3–9
b. Location of Adjusting Components . . . . 3–9
c. Checks Before Adjusting Shift Points . . 3–10
d. Calibration by Road Test Method . . . . 3–10
e. Calibration by Speedometer Readings Method
3–10
f. Calibration by Test Stand Method . . . . 3–10
3–14. TRANSMISSION STALL TEST AND
NEUTRAL COOL-DOWN CHECK
a. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . 3–15
b. Stall Testing Preparation . . . . . . . . . . . 3–15
c. Stall Test Procedures — Vehicles
Without Smoke-Controlled Engines . . 3–15
d. Stall Test Procedures — Vehicles
With Smoke-Controlled Engines . . . . . 3–16
e. Neutral Cool-Down Check Procedure. . . 3–16
f. Results. . . . . . . . . . . . . . . . . . . . . . . . . . 3–16
3–15. PRESERVATION AND STORAGE
a. Storage, New Transmissions . . . . . . . . 3–16
b. Preservation Methods. . . . . . . . . . . . . . 3–16
c. Storage, One Year — Without
Transmission Fluid . . . . . . . . . . . . . . . . 3–16
d. Storage, One Year — With
Transmission Fluid . . . . . . . . . . . . . . . . 3–17
e. Restoring Transmission to Service. . . . 3–17
3–16. REPLACEMENT OF COMPONENTS
WHILE TRANSMISSION IS IN THE
VEHICLE CHASSIS
a. Replacement of Selector Shaft Seal . . . 3–18
b. Removal of Output Flange,
Output Seal . . . . . . . . . . . . . . . . . . . . . . 3–18
c. Removal of Output Shaft Bearing . . . . 3–18
d. Removal of Speedometer Drive
Gear or Speed Sensor Wheel and
Selective Spacer . . . . . . . . . . . . . . . . . . 3–18
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