Hi Glenn,
Is the push button located on the end of the shift lever? Without being able to do any diagnostic testing my guess would be the switch on the shift lever has failed. I have had several very simillar cases with Ford vehicles and this the main culprit but not in every case.
There are many other things that could cause your symptoms, including a failing transmissions or transmission range sensor to name a couple, considering the age and mileage of your vehicle.
To get some background. How long have you had the vehicle? How long has this symtom been present? Does it happen all the time or is it intermittant? When you replaced the transmissions, were they new or used, did you replace the transmission range selector switch or any other sensors on the transmission or swap them over?
If you can give me a little more info I'm sure we can figure this out. Let me know.
Dan
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Thursday, October 8th, 2009 AT 10:35 PM