I did some speed runs today with the Caldera 10E. When I ran the 2s Lipo I got 37mph, and when I ran the 3s Lipo I did around 43-45mph, and nothing ran hot, but it was only speed runs also.
that sound about right to me.
Offroading with a 2s or especially 3s will produce alot more heat than speed runs, so dont change the gearing if you plan to do both.
But if you did want to just run on the street you may be able to go up 1-2 teeth on the pinion.
2s lipo make a big difference over the stock NIMH battery right?!
45mph is pretty impressive for that small motor and 35amp esc in a full size 1/10 4wd truck!