My Bl Mbx4

[Serum]

Yeah, i would get a 51 tooth plastic spur.. The 10T pinion is not too good for a metal spur. Have you got room for this spur? perhaps some spacers are needed.. But try a 12T first.


One hint;

the gears on the traxxas emaxx input shaft (smallest is 13T) are hardened. perhaps you could test one of those. (it has a 5mm hole, only needs to be tappered. The diffs you're using, are they 43/13?