Farmall m speed

It's 6% faster. I've got a whole book of ground speeds showing different ring and pinion combos for all makes and models, including a chart for the W6 ring and pinion. Click the link below to check it out.

Zack
Author/Publisher: The Antique Tractor Pull Guide
ATPG Ground Speeds Book
 
(quoted from post at 21:44:31 11/08/11) super m gears w6 rear end 20% RPM 4GEAR 13 MPH

How did you come up with 13 mph in 4th gear at 1920 RPM? Is that using a faster than normal 4th gear (normal was 6 3/4 mph)? And what size tire did you figure it on?

Just trying to understand the math.

Thanks!
 
4th gear in a Super M should be about 10.75, thats with 18.4s and 1920 rpm, there is a percentage increase for rolling circumference, and for rpm increase.
 
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