Some of the 22 drivers at one of our local indoor carpet tracks are also running the SC10 gear diff. Some have dropped them in straight with only some spacers to take away side to side play. Others have dremeled the mid motor case to move the outdrive bearings back ever so slightly to acheive better gear mesh and avoid a high spot.
I have the gear diff on order and hope to have mine ready for the next race. After watching the cars on the track last week and comparing it to my car with the ball diff I can say they were able to carry so much more speed through the corners. This was especially true on one corner that had some masonite boards taped to the carpet. The racers call the wood 'ice' as the cars can be very loose on this surface with newer mini pins. Worn down mini pins are the only option when any of this 'ice' is on the track. But the car looses alot of steering mid corner with regular ball diff. With the gear diff they were gaining 2 to 4 tenths of a second per lap.
I still managed to finish 3rd with ball diff in my car but 1st, 2nd and 4th were all running gear diff.
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