1990 Chevrolet APVFACTORY OEM SERVICE PROCEDURE

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)
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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.

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