If you are running off-road with mod motors, you have very little to worry about.
You'll keep the same motor in everywhere (usually 6.5 in 4wd, 8.5 in 2wd), use the mod motor profile on your ESC, adjust the ESC settings to give you the throttle feel you like, gear it to top out at the end of the long straights without overheating.
You should nail all that down within a few practice runs. If you go to an exceptionally large or exceptionally small track you might need to go up or down a couple of teeth on the pinion.
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