Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - CHECK PROCEDURE AND SHIFT SPEED
1990 Chevrolet Lumina APV V6-191 3.1L
A/T - Check Procedure and Shift Speed
1990 Chevrolet Lumina APV V6-191 3.1LSECTION A/T - Check Procedure and Shift Speed
9214chevy01
Number: 90-77-7A
Section: 7A
Date: October 1989
Corporate Bulletin No.: 977145
Subject: REVISED PRELIMINARY CHECK PROCEDURE AND SHIFT SPEED CHART FOR 1990 4L60/700-R4 TRANSMISSIONS
Model and Year: 1990 PASSENGER CARS WITH 4L60 TRANSMISSION
1990 LIGHT DUTY TRUCKS WITH 4L60 TRANSMISSION
TO: ALL CHEVROLET DEALERS
This bulletin provides a revised Preliminary Check Procedure and Shift Speed Chart for 1990 HM4L60/700-R4 transmissions. These charts have been updated since publication of the 1990 Service Manuals. Please make reference to these changes in your service manuals.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.