Originally Posted by
Thunderbunny
I'm using 50K. I replaced the composite gears because the slot on the back side of the big gear stripped on my second practice run. My home track has a lot of 180* turns (host track of last year's IFMAR Worlds), which works the diffs pretty hard. The car handles amazingly well when the diff holds up. I need to get this problem fixed. I've gone through three diffs so far. One with composites, two with NT1 gears.
Have you tried putting shoe goo to get rid of the backlash from the Pin and the groove in the back of the gear. I know people do this trick on the pulleys in some electric cars where the pins are fairly small and tend to wear out the groove in the back.