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Switching To EB410 Diff Ring & Pinion Gears

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RustyUs

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Tekno RC's
  1. EB48
  2. ET48
  3. ET410
  4. SCT410
Some people are going with the EB410's diff ring & pinion gears in their SCTs.
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If doing the swap, how for down on the motor pinion gear tooth count would a person have to go in order to have the same overall gearing as stock ring & pinion gear combo?

My math says its about a 6 tooth difference. EB410 gear ratio is 2.5:1 vs. ET410/SCT410SL's 4:1 ratio. Does that sound right?
 
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