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Re: Too much grease?
Excess grease does not make them get hot. If you used all the grease that came with the gearboxes, it is just the right amount. It is not too much.
There might be something else wrong. A few possibilities: The gears might be in "backwards"...there is a little lip around the center hole on one side, that lip needs to face the bearing, not the other gear. The motor screws might be a little loose, make sure they are tight (yes you need to take them all apart to check these things). The four screws that mount the plastic housing to the frame rail might be a bit too tight, which distorts the plastic.
And the motors get warm when you drive around, that is normal.
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