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Allis Chalmers Discussion Forum
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WC with Double Transmission

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ACEd

04-19-2012 18:54:23




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third party image

third party image

Can anyone tell me whats up with the double transmission - this is a 1948 WC with Thompson High Crop Conversion.




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mdtractormechanic

04-22-2012 10:13:24




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 Re: WC with Double Transmission in reply to ACEd, 04-19-2012 18:54:23  
ACEd,
Do you think that maybe they used a second trans to cut down on cost? I would amagine that having new ring gear and pinion specially manufactured would cost more that an 'off the shelf' transmission. Might even be a quicker change over.



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ACEd

04-26-2012 06:31:18




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 Re: WC with Double Transmission in reply to mdtractormechanic, 04-22-2012 10:13:24  
the 6.6:1 ring & pinion was a standard off the shelf item - so no



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gregger

04-19-2012 19:39:56




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 Re: WC with Double Transmission in reply to ACEd, 04-19-2012 18:54:23  
i bet it would have a real super slow speed with both in 1st gear



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gatz

04-19-2012 19:22:40




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 Re: WC with Double Transmission in reply to ACEd, 04-19-2012 18:54:23  
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Saw a similar one in Grisold IA at Bierbaum Musuem. Was told that with larger tires (Thomson setup) more reduction was needed. Also added benefit or more gears.
I dont recall if the frame had been modified or not; the WCs had the neutral box right in front of the differential, so maybe there was enough room for the 2nd xmsn without any changes.
This one was gas.

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ACEd

04-19-2012 19:40:31




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 Re: WC with Double Transmission in reply to gatz, 04-19-2012 19:22:40  
Thomsons generally had different rear end gears to make up for the 36 inch tires - I have 3 of them without the double transmission setup. As to more gears, most would overlap except at high end and low end - Very low creeper gear vs race speeds. I was thinking cane loader with one set reversed but no sign of such.



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gatz

04-19-2012 19:25:52




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 Re: WC with Double Transmission in reply to gatz, 04-19-2012 19:22:40  
edit...

Also added benefit or more gears.

'or' should be 'of'



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Josh Day

04-19-2012 19:51:06




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 Re: WC with Double Transmission in reply to gatz, 04-19-2012 19:25:52  
How fast would it go in both 4th gear?



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ACEd

04-20-2012 06:14:29




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 Re: WC with Double Transmission in reply to Josh Day, 04-19-2012 19:51:06  
Without taking transmission apart and counting teeth, it appears 4th is about 0.5:1, 3rd about 1:1, 2nd about 1.36:1, and first about 1.9:1.

Thomson would have had 6.6:1 final drive nominally with 12-36 (60 inch dia) or maybe 13-36 rears while regular WC would have had 4.7:1 final with 11-28 rears (50 inch dia)

Regular 1st was 2.5 mph and 4th 9.5 mph. So Thompson with single trans would have been about 2.1 mph in 1st and 4th would have been between 8.1 mph with 12-36 and 8.5 mph with 13-36.

So 1st 1st would have about 1.1 mph and 4th 4th up to about 16-17 mph.

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