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Originally Posted by coolhandcountry
The pro diff has a lower gearing than the other hb diff. It is 4.3 ratio verse 3.31.
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i was typing that ratio in to the speed calc thing on the net and found something weird dont know if my be i made a mistake but with stock emaxx diffs emaxx trans in second and a 51tooth 16tooth spur an pinion with 1950 8 i came up with a rpm of 36274 and a top speed of 41 with a 5.5" tire with .5" of ballooning. but when i plugged in the 4.3 ratio hb diff i would need 24 tooth pinion to get the same top end. well theres 2 problems i see with that big of a pinion. 1 thats a lot of rotating mass for a motor to have to spin up and 2 mike doesnt even have a 24 tooth the biggest on there is 20 so how would you go about fixing this prob? obw i could be using the speed calc thing wrong to so im a little :025: just got up :027: