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Discussion Starter #1
I swapped Th350's from my wagon to my 66' pickup & used the formula & charts on NovaResourse.com. I have used this before with no problems & now I have one. The pickup now has a large speedo gear so I figured it & installed the correct gears & it was dead on. Now the wagon has the smaller speedo gear & I used the same formula & I am waaay off. I have 3.08 gears & a 25" tall tire which lead me to used a tailshaft gear with 8 & a speedo gear of 20. It is 10-12MPH slow. I had a 23 speedo gear laying around so I put it in & now it is still 5MPH slow...how did this go so wrong? Any ideas??

Thanks, Andy
 

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Your tire is not tall enough for the 20 tooth.

I have a 3.08 gear, 20 tooth driven gear, with 26" tire. It seems to be very close.

I have also ran a 18 tooth driven gear on a 26 1/2" tire.
 

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Discussion Starter #3
onecarnut...how many teeth are on your tailshaft gear? Mine has 8.
 
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