Thanks again to everyone who responded with opinions and suggestions. After
much consideration, I felt that the gearbox oil was not the culprit, and
checked all my wiring connections. All appeared in good order, so I bit the
bullet, and ordered a new solenoid. Installed it this morning, and indeed
the overdrive is again working correctly. It appears that, as suggested by
Hans, the solenoid coil was indeed opening when it heated up. Then when the
current flow in the coil stopped, it would cool, and continutity would be
restored.
Thanks Again.
Chris Delling
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