Its a load of old cobblers that you have to rebuild the diffs after every race, though as the belt is exposed, dirt does tend to find its way into the rear diff.
If its dusty in the summer, I'll redo mine after 2 meetings, so far this year, its done 3 meetings and they don't need doing yet.
The BX is an awesome car, way better then the B44 I bought to replace it this year.
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