How to Troubleshoot a Chrysler Transmission
The transmission for most Chrysler vehicles is an automatic transaxle (which is usually just referred to as a "transmission"). Chrysler, in particular, has had numerous problems with their transmissions. Their "flagship" transmission, the A604 transmission (later re-badged as the 41TE), often experiences premature failure due to known defects and poor design. With that said, you'll need to troubleshoot the problem to verify what is actually broken before having it fixed.
Instructions
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Check the transmission fluid. Some transmission problems on the Chrysler can be caused by low transmission fluid. Pull the transmission dipstick out of the transmission filler neck in the back of the engine bay. Wipe off the stick with a rag and put the stick back into the filler neck until it bottoms out. Then remove it and check the oil fluid level. It should be between the upper and lower marks on the end of the dipstick. If it is not, fill the transmission with Chrysler ATF (automatic transmission fluid) until the fluid level is between the upper and lower marks on the end of the dipstick. You'll probably need to use a funnel to prevent oil spills in the engine bay while refilling the transmission.
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Check the operation of the shifter. There have been 900 reports to Chrysler on the 41TE transmission that the transmission will intermittently shift from "park" to "reverse" while driving. Engage the emergency brake. Turn the ignition to the "II" position. Check to see if the vehicle shifts into "reverse" on its own. Since this problem is intermittent, you may want to keep the emergency brake on until you are ready to move and take your Chrysler to a dealership to have the transmission shift fork checked (at a minimum).
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Check for slipping in first gear. Most transmissions from Chrysler have a known defect that may intermittently cause the transaxle to surge and "thump" into second gear. This hard shifting can be caused by low transmission fluid, but may also be indicative of a defective transmission. You will need to have the transmission serviced by a Chrysler dealer to have this problem solved.
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Engage the emergency brake, start the engine and shift the transmission into "drive." If your transmission shifts hard, or "bucks," you'll need to have the transmission checked by a Chrysler dealership and repaired.
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Tips & Warnings
For specific information about troubleshooting your Chrysler vehicle, consult the particular vehicle's manual (see Resources).