Not necessarily. MIP produced a gear diff unit for their RC10 pre-"Stealth" gearbox about 20 years ago, and they are fairly light and very reasonable for electric cars. IMO, they were the best diffs ever made for dirt oval racing. Freer and smoother than any ball diff I have ever built, and zero slip. Who says they'd need to be filled with fluid to work properly?
It CAN be done—it's been done already. With the materials and manufacturing technology we have today, there is no reason why it couldn't be an option.
There is one in this car...
Last edited by squarehead; 11-29-2010 at 03:00 PM.