Does Different Weight Diff Oil Affect Actual Top Speed

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Rocko10

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Arrma RC's
Recently put 7000cst in front and rear diffs and 50k cst in center diffs in my Typhon V2. Stock gearing. The thing is much more noticeably a monster off the line and mid range but I seem to have lost top speed by about 6-8 mph. I’ve tried to research if tuning diffs affect top speed but there so many different comments and opinions. I wouldn’t think that it would but the only thing that is different is the heavier diff fluid.
 
I think that is an interesting question.
IMO,
Yes. The roll out (circumference) of each tire at varying speeds will be different and traction side to side, front to rear will vary causing the diffs to do what they do (differentiate). With the heavier weight oil that process will consume more energy.
 
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