If you need to replace a sensor and run into an old one that is seized in the transmission
then read the following..
From 5th-Wheeeler (Jon):
Personally, I would think long and hard before installing any type of non-removable flooring
over the dog house inspection plate/panel.
If your unlucky enough to have a seized AutoShift transmission sensor in that top location
you will never be able to remove it without going in through the dog house as I had to and
even then it was a Pita to get out.
In fact, even after applying several forms of penetrating oil/fluid on the sensor for an
entire week it didn't come out in one piece as we had to use an easy out, a pair of channel
locks and a number of small Craftsmen implements to finally get it out in several pieces
followed by a good heavy fluid flush just to make sure nothing small fell into the transmission.
A call or three to Eaton tech support before using the easy out confirmed that this was the
only way to get a seized sensor out of the cavity that it slips into as they have run across
this very situation many times before.