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| So I bought a 7200 transmission and plan to swap it out on my 7100 tool bar. I want to swap the whole tranny because of how much easier the 7200 is to change population and because it gives you more options in the "heart" of the populations I run in. However Id like to avoid swaping as much as possible and not spend any more money than I have to.
With the help of this handy gear ratio calculator here is what I came up with
https://evolventdesign.com/pages/gear-ratio-calculator
On a 7200 here is how I see the gears going. Gear A50386 a 28 tooth sprocket from the wheels drive A50385 a 19 tooth sprocket on the counter shaft. Then AA64826 a 27 tooth sprocket on the counter shaft drives AA32197 a 18 tooth sprocket on the high side of the jack shaft. So its 28 x 19 – 27 x 18 for a final gear ratio of 2.2105
On a 7100 it goes like this. Gear A46101 a 12 tooth sprocket from the wheels drive A36734 a 8 tooth sprocket on the counter shaft. Then A79475 a 20 tooth sprocket on the counter shaft drives AA26802 a 30 tooth sprocket on the jack shaft. So its 12 x 8 – 20 x 30 for a final gear ratio of 1.000
If I just swap out the transmission and use everything on the 7100 I would end up with a 12 x 8 – 20 x 18 or a ratio of 1.6666 or 25% slower i.e. lower population than the 7200 book settings
So what I think I need to do is by using the 12 x 8 combination from my drive wheel on the 7100 and my 18 tooth gear on the 7200 transmission what do I need to make the gear on my counter shaft to make my final ratio as close to 2.2105 as possible. Or said another way 12 x 8 – (?) x 18 = 2.2105
Using the gear calculator if I do a 12 x 8 – 27 x 18 = 2.250 or 1.7% faster
If I do a 12 x 8 – 26 x 18 = 2.1667 or 2.0% slower
For $24 Shoup sells this 27 tooth sprocket gear for a Kinze planter
https://www.shoupparts.com/SH6112-27-Tooth-Sprocket
I think I am going to go with that 27 tooth gear from Shoup and just be 1.7% heavy. With finger meters I don’t think I am more accurate than that anyway
What am I missing guys? Do I have blinders on and I’m missing something obvious??
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7200 Transmission on a 7000 Planter
