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M46 overdrive troubleshooting 200 1983

With the ignition on, put the car into 4th gear and while stretching to push the button hold your head out the door to listen for the solenoid to click. Nice click means the wiring is working to the Solenoid.

My 83 when bought had a non working OD on the M46. I emptied the fluid and cleaned two screens. When you take off the bottom plate on the OD there will be a rectangular screen that pops off. I used throttle body cleaner to spray it out. Not sure what the best stuff to use would be. Then there are three circles with two little dimples that allow for opening. The one on the passenger side is the only one you want to open. Inside is a round tubular screen that I cleaned. Refilled with Type F auto transmission fluid (Redline best) and after a couple weeks I had the urge to try the OD on the freeway. It worked but its been working occasional when not too hot.

My next plan is to swap out the solenoid and possibly rebuild or replace with another lower milage OD unit/M46 I can obtain cheap. Although since I have a 10 hour trip (roundtrip) planned in two weeks I'm looking to just fill it with Redline rather than the stuff I have in it at the moment in hopes it will help.

I would listen for a click, if that works then go with cleaning the two screens and refilling with Redline Type F synthetic. I found a tool at Harbor Freight for $6 that will open the round filter cover.






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