When I throttle up on my T-Maxx the motor revs high but there is no big power to wheels. If I lightly throttle it I can get it going fast but I would need a football field to do so. I dont see any noticible wear on the gears that are visible. Hopefully its not in the transmission itself. I've only had my T-Maxx for 2 weeks and have driven it maybe 5 hours all together. The first couple of hours I drove it light and let it cool inbetween tanks.
BTW this is a 4907 model