chipset

JWKO. To answer your 2 questions about the siezed syncronizer. YES to both questions.
The motor runs just fine. The syncronizer doesn't actually sieze. The magnet falls out and trashes the half moon eclips. All the parts fall into and down the shaft. This is usually what siezes the shaft. As i said before my wife has living proof. Her car ran just fine with a busted syncronizer. the magnet and eclips were gone. Just a bunch of powdered metel where everything should have been and there was a hole in the top of the pick up sensor big enough to put my pinky finger in. Ford wanted $287.78 for the
shaft assembly and you didn't get the sensor. The car ran on " limp mode ".