[_paralyzed_]

2 things-

1. I don't understand what you did that you need shorter driveshafts. Did you change the center diff? Figure out what length you need. If you need 100mm dogbones you can usually find something within a mm or two on ebay by searching "100mm", then "99mm"or "101mm" etc., etc.

2. A buggy is light enough, you don't need nearly that much motor to reach 100mph. You can reach 100mph on 6s with an MMM and a 1512 size 2650kv motor. Additionally, the extra kv over the 1717 makes gearing much much easier. I just bought a Hyper 8.5 buggy with a 2650kv 1512 for the exact purpose of running 100mph to blow away the xo-1's.

You can certainly do it your way, and it will be cool, but there are much easier ways.