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Numerical transmission and final drive gear ratios for WC?

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Rick Z

03-23-2002 20:07:05




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I am wondering how much difference a change of tire size would make on a 1947 WC. It seems bit fast geared and I have to slip clutch alot especially in close quarters.

To do the math I need to find the numerical gear ratios for the tranny gears and for final drive. One search found suggestion that final drive is 4:1. Is this correct? Also what is modern equivalent size of original tires that originally came on this tractor?

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knut

03-24-2002 12:06:15




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 Re: numerical transmission and final drive gear ratios for WC? in reply to Rick Z, 03-23-2002 20:07:05  
Nebraska test #304 for WC Allis-Chalmers
11-28 Pnem. 1st=2.60 2nd=3.78 3rd=5.02 4th=9.62 40' Steel 1st=2.64 2nd=3.84 3rd=5.10 4th=9.77
Engine201 cu in. at 1300 RPM,PTO 534RPM



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Ken Foland

03-23-2002 20:28:38




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 Re: numerical transmission and final drive gear ratios for WC? in reply to Rick Z, 03-23-2002 20:07:05  
WC numbers for total drive ratio are.
First 67.6
Second 46.5
Third 35.
Fourth 18
Standard tires were 12.4 x 28



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steve

03-24-2002 05:57:26




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 Re: Re: numerical transmission and final drive gear ratios for WC? in reply to Ken Foland, 03-23-2002 20:28:38  
you only need the gear ratio if you want the exact speed in MPH. figuring the original speed, compared to new speed with smaller tires, you will see that the gear ratio and final drive numbers dont change. the only number that changes is the tire diameter, so the difference is speed it the ratio of the old diameter to the new. If the tire is 10% smaller diameter, then you slow down 10% in top speed.

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Rick Z

03-24-2002 06:52:40




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 Re: Re: Re: numerical transmission and final drive gear ratios for WC? in reply to steve, 03-24-2002 05:57:26  
Thanks Ken. Steve, I wanted numerical ratios as its hard to figure 10% of "Gee, that feels a little fast". 10% of 3mph (for example) is easy to figure. I dont have original speed in mph. AC left speedometer off my WC...;-)). I dont have a cops radar gun to see what actual speeds are either. However if I know ratios, know engine rpm, then I can measure circuference of tire and figure speed pretty darn close and how much change in speed that a change in circumference actually amounts to.

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Ken Foland

03-23-2002 20:27:58




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 Re: numerical transmission and final drive gear ratios for WC? in reply to Rick Z, 03-23-2002 20:07:05  
WC numbers for total drive ratio are.
First 67.6
Second 46.5
Third 35.
Fourth 18
Standard tires were 12.4 x 28



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JOE WASSON

03-24-2002 08:14:42




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 Re: Re: numerical transmission and final drive gear ratios for WC? in reply to Ken Foland, 03-23-2002 20:27:58  
ACCORDING TO MY STYLED W-C OWNERS MANUAL THE ROAD SPEED IN GEARS ARE AS FOLLOWS...1ST GEAR/2.5MPH.. 2ND GEAR/3.5MPH...3RD GEAR/4.75MPH...4THGEAR/9MPH,THIS IS WITH 11-28 TIRES.



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