I did a test. 7 in each diff ran the truck in 75 deg weather no wind three packs 6000 60 c current limit 80 no push control no drag break no timing set at min throttle profile 3 14 tooth pin 4600 pro 4 rx8 and it came off the track three different times at 180 motor and 97 speed control. went home changed to grease in all three, next day same thing three packs and the motor was 147 speed control was 84 so the grease was about 30 deg less . motor has so much magnet drag when you go down the straight and let off it almost goes sideways turning. just thought I would put this out there for your information. also promatch batteries has 6000's for sale is local and under 90.00 get it in three days go racing.