1/8 Diffs and Slipperential Gearing?

[BrianG]

You could use larger tires, or motors with a higher max rpm limit, like the LMTs. I know; not very good suggestions. There was another user here (can't remember who) that was trying to get a fast speed with the slipperential and was coming up against the same problem. The gearing was just too low for anything over 40ish mph....