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WC with Double Transmission

A

ACEd

Member
Can anyone tell me whats up with the double transmission - this is a 1948 WC with Thompson High Crop Conversion.
a68333.jpg

a68334.jpg
 
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.
a68338.jpg
 
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.
 
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.
 
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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