This off another site,thought it might help though.
"just came back from my first run with the XB4
I used the Martin Bayer Setup for carpet, running Schumacher Minipin.
I´m really impressed. Car has lots of steering, jumps very well and it´s aceleration is second to none.
I ran Durango and Kyosho on the same track before so I can compare.
I had some very bad "highsiders" and 2 really hard impacts but nothing broke.
Same to the drivetrain - nothing shimmed, everything stock. No Problems - and there is never more grip than on carpet with Schumacher Mini pins.
Martin told me, that the problems with the diffgears appear when you use too much oil in the diffs.
I filled the diffs with the HUDY scale, exactly like the manual says - no problems - super smooth and free drivetrain.
This car is a blast!
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