[suicideneil]

62/24 = 57mph
65/24 = 54mph
62/22 = 52mph
65/22 = 50mph
62/20 = 48mph
65/20 = 46mph
68/20 = 44mph
65/18 = 42mph
68/18 = 40mph

Try that on for size.

Unless Im mistaken, the largest 3s lipo packs you can fit are 5000mah, though dimensions do vary a little from manufacturer to manufacturer. if you remove the springy clips from inside the battery trays, that should allow a little more room. Also, with the taller gearing you may find the fins on your motor hit the transmission before the gears mesh.