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Ford Explorer automatic gearbox fault - buzbee
A Ford Explorer, that is may be 10 or so years old, has just had it's faulty automatic gearbox replaced with a brand new one. On a test drive it worked fine until the box got warmed up and then it stayed in drive and had to be braked to a halt juddering. Next day, it did the same again.

The garage that fitted it talked of it needing a sensor and said they had taken it to a Ford garage to be sorted out "because it is a Ford part".

As a relative of mine (some distance away)is spending about £1800 on this repair, I am keen to find out as much as I can on this. What does the sensor do?

Any info will be gratefully received.

Ford Explorer automatic gearbox fault - buzbee
Is the sensor story likely to be true? .... Or, as a more general question, why does any automatic gearbox behave like this when it gets hot?