it could be the liftkit. i had to remove mine because it did this, i removed it earlier and now it makes no noises at alll!
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Brushless RC18T, Brushless Micro DT, Midwest AeroStar .20, SCX10 Honcho, Duratrax 1/5 Firehammer MT, Traxxas Nitro 4Tec 3.3
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