![]() That being said, if fluid level is fine and the transmission has morning sickness, it has probably never been rebuilt in all of it's 55 years. Moving the steering column to the right will help hold it in Park, but still don't trust it. ![]() Just a little vibration can cause the transmission to drop into Drive or Reverse. Or, measure the stick while someone else sits in the car with his/her foot on the brake. EVER! Sit in the car with your foot on the brake, and have someone else measure the stick. DO NOT get out of the car with the motor running, ever. Now - if you've never owned a Thunderbird before, you will quickly learn that this car had one of the worst design flaws imaginable on a car - the shift lever. You do this by putting the car in neutral or park and measuring the dipstick with the motor idling. Change oils and filters first!įirst off, transmission: check the fluid level. If it still slips afterwards, it is possible it needs a minor adjustment or a torque converter rather than any other work on the transmission but. Once you do those things I mentioned it would be nice if you came back here and told us how you made out. Also many people never think to change transmission fluid if ever. ![]() It could possibly be burnt from trying to drive it when cold and low on fluid. Most important to be able to stop once you have it running / moving! Another thing you could do is change out the transmission filter and fluid. Definitely check, flush if possible, the brake system. Other things I would do, because you don't know the history of the car, is change out fuel, air and oil filters. That would be the proper way to check the engine oil but not the transmission fluid. If the previous owner checked it with the car shut off and sitting in Park they would get an erroneous reading. That way all the fluid that is going through valves and passages is where it should be. ![]() I personally run it through drive, neutral, reverse a couple times before I check the fluid level. If I remember correctly you would have a C6 transmission and you should check it when the car is running with the shifter in neutral (possibly in Park but running nonetheless). Usually the dipstick will tell you what you need to do to check fluid. Maybe the person who owned it did not know how to properly check transmission fluid level. ![]()
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