3.8s have just take time to build up their total speed...but using 12:1 (blue) gearing will help compensate, because hey...in normal driving, you hardly would ever get your 3.8 up to its top speed with Teal (top end) gears anyways. You would just be very slow, and once you GOT to top speed and turned, you slow down again, having to wait forever for it to speed up again. Despite this being slow, it also means less battery.
note: the above setting might be good for drag racing..dunno
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cowfish, its the motor that is brokin on minez, cuz i took all the gears out and tried the motor alone, and it studders and stop, till u toch it.
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This probably isn't it, but your motor might have bad contact with the car (this happened with my 3.0)
I just found the little tab on the back of the motor, slid an exacto knife under it, and bent it out EVER so slightly...not hardly at all.
If that's not it, then i would send it back.