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 MANUALSCHEVROLET1990STEP VAN 5.7 K, AUTOMATIC, 3L80/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSTRANSMISSION APPLICATIONIDENTIFICATIONAUTOMATIC TRANSMISSIONS

1990 Chevrolet Step Van 5.7 K, Automatic, 3L80/M40

Automatic Transmissions

1990 Chevrolet Step Van 5.7 K, Automatic, 3L80/M40SECTION Automatic Transmissions

AUTOMATIC TRANSMISSION APPLICATION

Model	Transmission Model
"C/G/K/P/R/V" Series	3L80/3L80-HD (THM 400/475)
Astro/Safari, "C/G/K/R/S/T/V" Series	4L60 (THM 700-R4)
Lumina APV, Silhouette & Trans Sport	3T40 (THM 125-C)
"S" & "T" Series	Hydra-Matic 3L30 (THM 180-C)

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.