once a week or so the tranny (automatic) downshifts as if it is being
ran with the downshift switch (underneath the gas pedal) is engaged.
Shifts at high rpm's and wont go into overdrive.  I replaced the
switch, no luck still does it every now and then.  It is also starting
to not shift into reverse.  It does this about once a week.  Could it
be something else besides mechanical problems with the tranny since it
is soo spuratic (computer??), or do you think i should start looking
for a used tranny