Call me crazy but I actually tried this once.
I had it geared with 22 tooth pinions on a 65 tooth spur. The thing would lay black marks on my concrete driveway. LOL
Top end was 55 or 60mph, but It hardly ever seen that. Talk about unstable at high speed. It was like a fat lady swinging her hips. LOL
It was HEAVY! I had 12 Nimh cells powering each ESC. I could have moved up to 14 cells but I kept slinging the pins out of the drive shafts even with removeable locktite.
I couldn't get the diffs to hold together either.
Aaah well, we live and learn