We can discuss for lightyears, how to rebuild the diffs, how to set them up. Additionally we can spend many nights on debating, when parts need to be replaced.
With the current models I made the following experiences:
- the standard diff balls work pretty good. To be honest: I am still using the same ones, for 2 yrs now
- u3140: diff washers: I replaced them after some 12 races and turned the inside out after 6 races
- I opened the diff after 2 races, and cleaned everything, using new diff lubricate (in my case Tamiya ball diff grease
- I never had to replace the Diff screw bearing. (in the 90th, this was a bad, breakable part)
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