Starter keeps spinning after release

See the field terminal in diagram, it has that green covering, when you let go of key, see if there is voltage, use a test light. If no voltage, then the problem is mechanical, for some reason, the starter drive gear is hung up on the flywheel. The starter solenoid s terminal should not be hot when key is released. Use a test light. That S terminal is smaller terminal not bat terminal. I don't know what testing you have done? I did see what you replaced. Any testing at starter motor make sure tranny is in park or neutral and parking brake is set.

Ok will try . This seems to be only happening when truck is up to temp. Intermittent

Intermittent can be a pain to track. Have to test when problem is ongoing.