Farmall SM gearing

boomdriver · Jul 20, 2016

I pull a Farmall SM in 5 mph classes. It has plenty of power in 1st gear, but it only runs about 3 mph. Running 2nd gear @ just under 4 mph , it runs out of power. I'm looking to get a little bit more momentum to compete against higher horsepower tractors without spending a lot to to do it. I run 14.9x38 Goodyear Suregrips mounted on 16 inch steel pressed rims.Would 2nd gear from a Farmall M be slower than the 2nd gear of the SM and about how much difference would there be?

Lee460 · Jul 20, 2016

Farmall M 2nd is 3mph SM 2nd is 3 3/4 mph. M 3rd is 4 1/4 mph. SM 3rd is 5 mph. This is out of the tractor data book. I myself would spend what I could on more horses. Lee

PretendFarmer · Jul 21, 2016

It would probably be more worthwhile to bump up the hp than it would to slow it down.
Save for a stroker kit.

cornerpost · Jul 21, 2016

Well you could go to 15.5-38 on same rims and be a tad slower. What do you have on dyno for hp?

Farmall SM gearing

boomdriver

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Lee460

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PretendFarmer

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cornerpost

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