fordmerc Posted September 29, 2018 Share Posted September 29, 2018 R9 overdrive is intermittent: sometimes it works perfectly. Other times it won't go into overdrive until after I hit a pothole (!) and then it works fine for a while. Another bump may stop the car from going into overdrive. I would appreciate comments and suggestions about prevention and cure. Link to comment Share on other sites More sharing options...
K8096 Posted September 30, 2018 Share Posted September 30, 2018 My dad had 1948 Custom series many years ago that had similar symptoms. I think there's a solonoid somewhere in the wiring of the O/D system that was working intermittently. Once that was replaced the problem was solved. Link to comment Share on other sites More sharing options...
fordmerc Posted September 30, 2018 Author Share Posted September 30, 2018 I was concerned about that so I will pursue that issue. Any other suggestins will be welcomed. Link to comment Share on other sites More sharing options...
billorn Posted September 30, 2018 Share Posted September 30, 2018 What you describe definitely sounds like a wiring issue or electrical. Is there a loose wire somewhere that jiggles when you hit the bumps? Link to comment Share on other sites More sharing options...
HH56 Posted October 2, 2018 Share Posted October 2, 2018 Also check the lockout switch on the back of the lockout knob bracket under the dash. If the plastic switch plunger has a groove worn in the end the switch can be right at the edge of turning on or off and vibration can cause it to make or break the connection intermittently. If there is a groove and the serrated lockwasher is still in position, removing the switch and taking out the lockwasher will allow the switch to sit in farther and probably work for many years to come. If the lockwasher has already been removed then I don't know of any repair that will last very long and replacing the switch with one less worn is the option. Link to comment Share on other sites More sharing options...
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