Checking Transmission Fluid - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 3 (permalink) Old 03-19-2012, 04:35 PM Thread Starter
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Checking Transmission Fluid

I need to check my Tranny Fluid. Some of my friends say check it while the engine is running while others say check it with the engine off. Which way do you check your transmission Fluid? I have a 4.7. Thanks Steve.

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post #2 of 3 (permalink) Old 03-19-2012, 04:56 PM
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Steve,
Follow these steps.

1. Remove and wipe off dipstick.

2. Start engine, let it drop to normal idle.

3. Shift into Drive, 5 second count, nuetral, 5 second count, reverse, 5 second count, and back to park.

4. With it still running, insert fully and remove dipstick and check your reading.

5. Do this only once.....every time you insert and remove the dipstick it pulls a bit of fluid up the tube, making the next reading incorrect.
You have to wait about a full minute for the fluid in the tube to make it back into the trans pan before a recheck can be trusted.

Your dipstick is clearly marked with cold and hot limits.
If you are fresh off the road after a thirty minute or longer ride you should find the level at or just short of the 'full hot' line.
If you just fired it up, you want it to be at or very slightly above the 'cold' line.

So, yes, it must be running.....the gear shifting is to purge air from the clutch apply pistons and it is how the front pump and torque converter are filled.

If you were to check it, say after sitting overnight, without starting it you would find the level grossly overfilled......this because the torque converter and other hydrolic components have drained down into the pan.

Rob


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post #3 of 3 (permalink) Old 03-19-2012, 06:29 PM Thread Starter
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Thanks Rob.

Once a Battleship Sailor always a Battleship Sailor.

I am US Navy Retired, 1976 - 1996
and Proud to have served

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