It's simply just because there was no grease in the gearbox. 2 metal gears together, dry, will cause this to happen. I just usually put a few dabs of black grease in mine whenever I have to strip it down for a diff change or what not. It's messy but after 6 months I'm still on the same internal gears from when I got the car on release date.
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Inside line racing
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Maclan
Moody fools
Richpaint
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