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Tractor Pulling Discussion Forum

Re: Gear ratios

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Jeff Gravert

12-19-2013 16:47:26

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You need to know the teeth counts of each gear set that is involved with the power flow of the tractor and find ratios of them individually. For instance, 1. the constant mesh (if your brand is equipped with), 2. the ratio of each gear speed in the transmission, 3. the ratio of the ring and pinion 4. and then the ratio of the bull gears to the bull pinions or whatever final drive your machine is equipped with. 5. If your machine has some type of shift on the go device, ( torque amplifier, power director, etc) then the ratio of each side of it needs to be figured. Those are more difficult since a planetary assembly is generally used for the low side but high is usually one to one. Once you have all these ratios as the power is sent from the input shaft to the rear axle, you multilple each group together. That will give you the total reduction. Its not fast but it is not difficult once you have all the information. A parts book can sometimes be helpful with the teeth counts per gear set but some brands you have to have the lid off and count everything manually. Good luck, Jeff

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Pulling in Ohio

12-20-2013 07:00:54

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 Re: Gear ratios in reply to Jeff Gravert, 12-19-2013 16:47:26  
Thanks, that's a great explanation, could you tell me how to add my tire size into the formula?

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