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Pontiac of the Month

Debbie Harris's 1969 Grand Prix

2021 October
of the Month

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  • Founders

Inspecting the fluid level on a 4T40-E is similar to inspecting the fluid level on a manual transmission. It uses a fill plug (oil level control plug) rather than a fill-tube and dip stick. To inspect the fluid level, follow the procedure below.

Caution: Removal of the oil level control plug when the transmission fluid is hot may cause injury if fluid drains from the oil level control plug hole.
* The transaxle temperature should be above 40° C (104° F).
* Raise the vehicle and make certain it is level (do not raise just the front of the vehicle).
* Apply the brakes, move the shifter through all of the ranges (engine running) then return the shifter to the park position.
* Remove the oil level control plug.

If fluid does not drip from the oil level control plug hole, the fluid level is low. Add fluid through the vent cap as necessary.

Fluid level requirements after service:

* Bottom pan removed………..7 liters (7.4 quarts)
* New converter………………2.5 liters (2.6 quarts)
* Complete rebuild……………10 liters (10.6 quarts)

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It's also damn near impossible without a lift.  Gotta say, I'm impressed at how long you've managed. That trans isn't known for it's longevity.

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