Overdrive does not always disengage.
1983 240 manual transmission. The overdrive always engages perfectly but sometimes
does not disengage. The relay has been replaced, the OD light always goes out, and the
click of the solenoid can be heard. I removed the solenoid and it snaps smartly in and
out with each application of power. I changed the trans oil and this solved the problem
for a short time, then back to staying engaged about one out of three times. What next?