Hi,

the new dampers may have a slightly increased bore inside (big bore style). So the pistons are new and the cylinder is thinner, than the previous ones.

The Tamiya numbering method is also very easy: As soon, as the internal gear ratio will be changed, the number changes. The current diffs seems to have 38 or 39 teeth, so it has nothing to do with the "old" 37/18=418 ratio.

I hope, that together with the new lowerdeck this car will be more suitable to all racetracks all over the world than the "stiffy" 418 was. Smokem had shown us, where the direction can go, when taking the apropriate material.