05-23-2020, 10:29 AM | #1 |
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What is this?
I feel stupid asking but what is this? Thanks.
Last edited by jkflathead; 02-23-2024 at 04:49 PM. |
05-23-2020, 10:33 AM | #2 |
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Location: sw minnesota
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Re: What is this?
its an underdrive for AA trucks
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05-23-2020, 10:35 AM | #3 |
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Re: What is this?
I jumped the gun I think cas3 has got it right.
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05-23-2020, 11:03 AM | #4 |
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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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05-23-2020, 11:19 AM | #5 |
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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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05-23-2020, 12:03 PM | #6 |
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Re: What is this?
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05-23-2020, 12:20 PM | #7 |
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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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05-23-2020, 12:23 PM | #8 |
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Re: What is this?
Here's one taken apart.
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05-23-2020, 12:32 PM | #9 |
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Re: What is this?
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 |
05-23-2020, 12:43 PM | #10 |
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Re: What is this?
It's just a two speed planetary transmission.
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05-23-2020, 01:08 PM | #11 |
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Re: What is this?
Run it backwards!
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05-23-2020, 11:06 PM | #12 |
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Re: What is this?
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05-24-2020, 06:25 AM | #13 |
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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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05-24-2020, 08:34 AM | #14 |
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Re: What is this?
I wonder what it cost when new??
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05-24-2020, 10:14 AM | #15 |
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Re: What is this?
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05-24-2020, 10:24 AM | #16 |
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Re: What is this?
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