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Old 11-14-2023, 01:00 PM   #1
1952henry
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Default Model AA 3 speed and auxillary

Saw a 28-29 chassis in scrapyard and could not help myself. Transmission shifts as does auxillary. No practical use for it, other than belting to my old blacksmith drill, perhaps.
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Old 11-14-2023, 03:32 PM   #2
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Default Re: Model AA 3 speed and auxillary

That second gear box is a Ford Dual-Hi that was married with the three speed transmission from a Ford car. Standard issue for 28's and early 29's. The Dual High gave you an under-drive.


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Old 11-14-2023, 03:56 PM   #3
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Default Re: Model AA 3 speed and auxillary

Thanks, that what I understand. Just couldn’t let it go to the torch and come back as a Turdota. May find a way to belt it to my old 2 speed champion drill press. That would give me 12 speeds!
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Old 11-14-2023, 04:34 PM   #4
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Default Re: Model AA 3 speed and auxillary

Quote:
No practical use for it, other than belting to my old blacksmith drill, perhaps.

Actually, several internal gears on the commonly used machine tool "Drive-All" are the same gears used in the Model A.

Three forward speeds - no reverse.





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Old 11-14-2023, 04:46 PM   #5
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Default Re: Model AA 3 speed and auxillary

I have often thought that a "Dual High" could be incorporated into a torque tube - but done "backwards" to offer an overdrive.

By the time you are done, you may as well buy a Mitchell Tranny.

I have observed that the dual high seems most closely associated with the three speed Model A transmission. By the time the four speed was offered, the low end gears were considered low enough so the dual high wasn't required.

Instead by then everyone was buying a Warford for the Model AA - which offered an overdrive.

The special parts to mate the Warford unit to the Model AA were included in the "Green Book" (1947) Including the special mix/match universal joint.

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Old 11-14-2023, 04:52 PM   #6
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Default Re: Model AA 3 speed and auxillary

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It has been done with success. There was a NC legendary stovebolt back in the 50s that had a set up like that that was fast then.
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Old 11-14-2023, 05:11 PM   #7
1952henry
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Default Re: Model AA 3 speed and auxillary

I’ve seen threads on the HAMB where people have contemplated running it backwards. Didn’t see that anyone did. I just have a soft spot for the old iron. And here I am trying to deplete my wares….
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Old 11-15-2023, 09:52 AM   #8
Ray in La Mesa
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Default Re: Model AA 3 speed and auxillary

A member in our club had a '30 coupe with a "reversed" dual high trans he ran for 30 years with no problems. He has since passed away.
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Old 11-15-2023, 04:39 PM   #9
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Default Re: Model AA 3 speed and auxillary

These must have been ideal for local service trucks in the day. Like coal deliveries, and tow trucks.
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