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M46 overdrive was erratic....I think I fixed it. 200 1981

uid 24778's pic
posted by  khanawalt on  Mon May 31 09:18 CST 2004
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last visit: Thu Dec 6 21:03 CST 2007
[RELATED]

My overdrive would disengage sometimes while going down the highway, but the light stayed on. I could hear no relay click.

I got under it today and moved the wire from the solenoid to the transmission, and it came loose from the blade connector end. So I cleaned it up and installed a new connector.

Presto, OD seems to work fine now. (fingers crossed) Must've been barely enough wire hanging on to let it work most of the time, but wouldn't let enough juice through there to work under all conditions.







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    M46 overdrive was erratic....I think I fixed it. 200 1981

    posted by  someone claiming to be Svender on  Mon May 31 18:38 CST 2004 [RELATED]

    1982 245 Turbo Wagon B21FT M46 w/OD

    I had a problem where my OD would jump out on its own... It would also do this if you bumped or tapped the shifter... Discovered the switch on the tranny was bad or something internally around that mechanism...I fixed the problem by by-passing the switch all together. Basically, i'm using a toggle switch and when it is in the on position, it is grounded. The wire that was connected to the switch on the tranny is now connected to the toggle switch instead which I installed on the dash above the temperature controls.. I also installed a little green light to tell me the car can now go into overdrive.. Didn't wanna take the chance on spending the money on a new switch for the tranny... Donno how much they are but i'm guessing they are spendy.. This works really well for me. I'm not fighting the OD any more.. and I have complete control of when and where I want the car to go into overdrive.. Keep in mind though, If the toggle switch is on, the overdrive will engage in 1st, 2nd, 3rd and 4th gear... This is why I installed the light, so I know visually when the OD can be engaged...

    Maybe something to look into... Many hours spent figuring out my problem may be helpful in finding yours... Good luck...

    Svender








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      M46 overdrive was erratic....I think I fixed it. 200 1981

      posted by  someone claiming to be Svender on  Mon May 31 20:17 CST 2004 [RELATED]

      Did some reading further in the forums... be really careful when doing my mod... because if you go into OD in reverse... It will ruin things for you...

      Svender








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        M46 overdrive was erratic....I think I fixed it. 200 1981

        posted by  Cliff Pope on  Mon May 31 20:30 CST 2004
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        last visit: Thu Feb 3 05:28 CST 2011
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        Reversing in OD is always said to do instant internal damage. I like the idea of your mod, but I'd try and rig up some sort of inhibitor switch on the gearlever. The reverse stop bracket looks a likely spot - what about fixing on a micro switch that detects when the lever is moved over to the reverse position?
        Also remember you can never absolutely guarantee that someone else won't move your car - a garage, or a work colleague needing to get his car out.








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          M46 overdrive was erratic....I think I fixed it. 200 1981

          posted by  Svender on  Mon Jun 7 19:10 CST 2004
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          I'm thinking a magnet switch would work well... Magnet attached to shifter and using reverse bracket to mount switch.. In 4th gear, magnet engages switch and the connection is grounded and OD can be engaged... Never seen magnet switch although never looked for one either.. Most likely there are such things and this is what I will use if i find one to avoid OD damage if engaged in reverse.. Thx for all feedback...

          Svender







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