I really don't know that you can push a 1/10 scale truck to much over 60 and retain any sort of control. The tires and suspension actually become your enemy at those speeds. In fact, doing 75+ with an on road on anything other than a prepared track was dicey.

We were able to attain 94+ mph with an 1/8 scale Kyosho on road car with a 1900kv motor on 5S lipo. It was all in the gearing and not the sheer rpms.