Farmall M stuck in two gears?

I have an M I’m rescuing that’s been sitting in the elements for many years. I thought it was set up but discovered it turns over when the clutch is pushed in.The lever is in neutral and at first none of the gears worked but I took out the lever and dumped in some transmission fluid to free it up and now it will go into reverse 1st 2nd and 4th so I’m thinking it may be in two gears at once? what would that look like down in the hole, what would it look like if normal? I appreciate your helping trying to rescue the old girl, it was my dads and he's gone now, I remember riding on his lap and steering when I was little. Thanks,
Eric
 
Look down in there you should see the shift rails that the shift goes into just take tire iron and line up the rails crossways in the platform slide there back and fouth to free them up,
 
It's hard telling what might be stuck. It could be in two gears. (with the shifter lever in neutral it should only still be in one) Or the brakes could be rusted stuck or who knows what if it's been sitting out long enough. And it's real common to find several gallons of water in the rear housing so if you have any freezing weather it's frozen solid.
 
Not sure about M, but on H I THINK you can unbolt the belt-drive delete plate and see the shift forks fairly easy.
 
there hasnt been any freezing weather yet, and it has been this way for a few years, I always thought it was set up. We just parked it maybe 15 yrs ago when we got a bigger tractor.I miss it and miss him and thought it'ld be great to try and get it running. The lever is rusty and the forks moved real haard at first. I guess it could be a rust horror show in there. Ill drain and keep you posted
 
This works ! when I was a teen, I used to get our M stuck in two gears. (by speed shifting) but I could remove the shifter and line up the 'three' sliders with a tire iron... this was after I watched the mechanic do it on the first $50 'service call'. In neutral, the sliders should be all lined up.
 

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