95 Wagon weird trans issues
 

1995 Taurus wagon reg. 3.0 v6, O/D trans.
This thing is fine when it's cold but once it warms up it acts crazy, Shifts - doesn't want to shift. Bucks like crazy. (doesn't slip though)
Wife tells me what she does is pulls over, puts it in park for a min a 2 then takes back off, Sure enough she was right. I changed the fluid and filter and still no change. Any ideas? Could a sensor be causing this?
(check engine light is not on) ... Appreciate any/& all help ..... Thanks, Joe

more info
 

Hey sorry for the type'O in the subject line.... OK anyway now the ABS light is on, Brakes done 3 to 4 mns. ago just checked them again and can't find anything wrong with them. Could all this be caused by a speed sensor?