They have steel outdrives and you can use better 3/32" diff balls and losi spring. The slipper adjustment is critical to keep from smoking diffs. I don't really see how the diffs in the SB V2 are that much different from the common ball diffs, with the exception of smaller balls. I'm thinink that there may be a potential to machine back the ring lands on the steel outdrives to allow the use of 1/8" balls if I find I just can't keep the diffs togeather. That and breaking in the diffs gently.
If I could only draw what I see in my head, then afford to build it, and finaly get to play with it...
Diffs are the reason you need to start with an all steel drivetrain. I finally stopped trying to make 1/10 buggies go really fast because the smell of melting plastic sucks! If it was originally designed for nitro it probably has a chance of surviving the BL experience. The CRT.5 is a great conversion, built like a small tank.