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Old 05-23-2020, 10:29 AM   #1
jkflathead
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Default What is this?

I feel stupid asking but what is this? Thanks.
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Old 05-23-2020, 10:33 AM   #2
cas3
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Default Re: What is this?

its an underdrive for AA trucks
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Old 05-23-2020, 10:35 AM   #3
jimvette59
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Default Re: What is this?

I jumped the gun I think cas3 has got it right.
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Old 05-23-2020, 11:03 AM   #4
jkflathead
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Default Re: What is this?

Thanks. I thought that it was some kind of overdrive. I found a matching picture on an AA truck. Any applications for a shortened driveshaft hot rod set up?
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Old 05-23-2020, 11:19 AM   #5
cas3
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Default Re: What is this?

its underdrive, not overdrive. more reduction for the poor little car motor in a big truck loaded to the max and trying to get up a big hill
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Old 05-23-2020, 12:03 PM   #6
tubman
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Default Re: What is this?

I am unfamiliar with these; do they shift manually (NO synchromesh)?
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Old 05-23-2020, 12:20 PM   #7
cas3
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Default Re: What is this?

i have never been inside of one, but i would guess due to the era built they are of the sliding gear type, and not synchronized.
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Old 05-23-2020, 12:23 PM   #8
Bob C
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Default Re: What is this?

Here's one taken apart.
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Old 05-23-2020, 12:32 PM   #9
V8COOPMAN
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Default Re: What is this?

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Originally Posted by Bob C View Post
Here's one taken apart.

Looks like it kind'a works like an "In/out" box. Kind'a like you start-out in underdrive if you're gonna need it, then just shift 'out' of U/D when you've topped the hill. What a contraption! DD


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Old 05-23-2020, 12:43 PM   #10
Bob C
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Default Re: What is this?

It's just a two speed planetary transmission.
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Old 05-23-2020, 01:08 PM   #11
tubman
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Default Re: What is this?

Run it backwards!
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Old 05-23-2020, 11:06 PM   #12
Tinker
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Default Re: What is this?

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Run it backwards!

Seriously I was going to ask this. Why no? I'm just knee jerking.
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Old Yesterday, 06:25 AM   #13
jimTN
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Default Re: What is this?

There was a 6cyl stovebolt in NC back in the 50s that was legendary for speed that had one of these in backwards.
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Old Yesterday, 08:34 AM   #14
Ol' Ron
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Default Re: What is this?

I wonder what it cost when new??
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Old Yesterday, 10:14 AM   #15
Bob C
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Default Re: What is this?

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I wonder what it cost when new??

April 15, 1928 parts book shows $50.00.
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Old Yesterday, 10:24 AM   #16
JSeery
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Default Re: What is this?

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April 15, 1928 parts book shows $50.00.
That would have been high dollar, close to 10% the price of a car!
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