the best advice as regards to running a brushless system in a cobra is to retro fit another gearbox. Modifying the standard gearbox is ok but its not easy or cost effective. I have fitted a b3 gearbox, a b4 gearbox will fit and i am sure the ansmann could be made to fit also. Which ever gearbox you choose is at least easy to get bits for when required. I am trying tamiya front db01r driveshafts. While basic, they are strong. The best mod other than the gearbox is to move the steering belcranks to give better ackermann. I makes the car more predictable in the turn. Despite how basic they are, they can be made to go very well.
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