Both tractors have approximately the top speed in 5th gear at rated engine rpm. That would be 16-17 mph.
The tractors use different sized tires. To compensate for this, the differential gears (ring gear and pinion) are different. This is just a guess but if one were to install W-4 gears in a H, the H may exceed 20 mph at rated rpm.
I am told that caseih.com doesn't list parts for the W-4. This means that the actual ratio for that tractor will have to come from an original or reprint parts book.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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