I just bought a used '87 Toyota PU with an automatic transmission with
overdrive.  It seems to shift from 2nd to 3rd later than I would
expect.  If I accelerate very slowly it shifts to 3rd at about 38 MPH.
I can drive at a constant speed at 36-38 and it will stay in 2nd gear.
There is a noticable jerk on shifting 2nd to 3rd; not serious, but more
than there should be.  1st to 2nd is find and overdrive and kickdown
seem to function as they should.  What does this suggest to the
transmission experts on this group?

The truck has 200,000 miles on it and has been pretty well maintained
most of its life.  I got service records back to 1991.  Transmission
fluid levels have been reugalrly checked and changed several times.  It
had a transmission service about 30,000 miles ago at a transmission shop
that appears to consist of change of fluid and inspection of function
that found no issues.

Thanks for any advice and information.

Jon Splane