Transmission disengages while driving

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Have you checked the transmission fluid to confirm it is clean and full? Has the transmission fluid ever been changed along with a new filter?

I almost hate to say this, but to check the fluid, you need a special dipstick. There is a cap on the transmission dipstick tube that is removable. Once removed, Chrysler has a dipstick that is used to determine if it is full.

Here are the actual directions. The attached pics correlate with the directions.

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CHECK OIL LEVEL
Special Tools

Dipstick 9336
pic 1

STANDARD PROCEDURE
CHECK OIL LEVEL
1. Verify that the vehicle is parked on a level surface.
2. Remove the dipstick tube cap.

WARNING: Risk of accident from vehicle starting off by itself when engine running. Risk of injury from contusions and burns if you insert your hands into the engine when it is started or when it is running. Secure vehicle to prevent it from moving off by itself. Wear properly fastened and close-fitting work clothes. Do not touch hot or rotating parts.

3. Actuate the service brake. Start engine and let it run at idle speed in selector lever position "P".
4. Shift through the transmission modes several times with the vehicle stationary and the engine idling
5. Warm up the transmission, wait at least 2 minutes and check the oil level with the engine running. Push the Oil Dipstick 9336 into transmission fill tube until the dipstick tip contacts the oil pan and pull out again, read off oil level, repeat if necessary.

NOTE: The dipstick will protrude from the fill tube when installed.

Pic 2

6. Check transmission oil temperature using the appropriate scan tool.

NOTE: The true transmission oil temperature can only be read by a scan tool in REVERSE or any forward gear position.

7. The transmission Oil Dipstick 9336 has indicator marks every 10mm. Determine the height of the oil level on the dipstick and using the height, the transmission temperature, and the Transmission Fluid Graph, determine if the transmission oil level is correct.
8. Add or remove oil as necessary and recheck the oil level.
9. Once the oil level is correct, install the dipstick tube cap.

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If the transmission hasn't been serviced for a long time, I have actually seen the filter get plugged causing the car to stop moving. Once the engine is shut, the dirt in the filter drops back into the pan and it works again until the process starts all over again.

If you can, check the fluid and let me know the results. Also, if the check engine light is on, you really should have the computer scanned to determine if there are diagnostic trouble codes stored that may relate to the transmission,

Let me know,
Joe