Make sure that the output drive to the centre is not on too tight as this will constrict the bearings in the gearbox cases. You can usually tell if this is happening as the output part of the shaft coming out of the gearbox case can become hot after a race. Also make sure that the cvd's are greased up as I found that made a big difference especially on the centre shafts. The other main area of friction I have found is with the crunch spacers getting crunched or wearing down. Use the centre of a 5x10x4 bearing for the rear and HB61490 steel spacers in the front which allows you to tighten the wheels up properly without the car binding and also allows the front bearings not to get ruined.
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