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Old 02-27-2012, 08:24 PM   #1
700rpm
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Default What is it?

A fellow club member sent me this, wondering what it was. An early overdrive unit? Anybody know?
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Old 02-27-2012, 08:32 PM   #2
Glenn C.
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Default Re: What is it?

Could it be an underdrive, not an overdrive, that would have been used for some sort of industrial application
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Old 02-27-2012, 08:37 PM   #3
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Default Re: What is it?

That is a Ford underdrive installed in most all AA trucks form 1928 thru Sept 1929 behind the car 3 speed transmission.

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Old 02-29-2012, 12:19 AM   #4
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Default Re: What is it?

A few guys have turned them around & used them as an Overdrive in an A,but they are a bit noisy in OD and are a heavy unit.Not too practical in my opinion.
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Old 02-29-2012, 02:26 AM   #5
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Default Re: What is it?

Yes, that is a Ford AA item, my 1928 AA had one. There is a "U" shaped rocker pedal you press with the heal of your foot to shift them.
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Old 07-30-2012, 02:59 PM   #6
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Default Re: What is it?

Yep, it's a split shift H/L underdrive gearbox, just as SteveB31 points out. My friend Joe has a fully restored '28 AR AA flatbed C-cab truck, with this installed behind the standard Ford 3-speed tranny. The top speed is 35 - 40 MPH in H3 gear. Yet it'll do 0-5 MPH with full torque in L1. Great for pulling heavy loads, that's why it has a low top end speed. Roadster62 mentions the rocker pedal, which makes shifting between H/L very tricky while under way.
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