ray. right now I am only going to run rubber tires on the car so that I can prepare for the tcs race in wisconsin in a couple of weeks, and after that I will try the foams, I am not in the mood to chase setups between foam and rubber before this race. I still need to experiment with gearing and mod motors so that will be the focus of my testing. I am planning on going up to larry's after work today to do some testing. By the way, did you end up getting an extra front diff for the car and were did you get the parts from.