[Cory]

Im guessing your tires have a very large surface area. There is so much friction that your motors do not have enough torque to overcome. This happened to us when in high gear last year. if your tires do not have a large surface area, im confused as to why this is happening. Last year we used very very grippy pneumatic tires, and we have pretty much a zero turning radius.

I think changing your gear ratios is the best path to take. if you are using sprockets and chains, with the drill motors, we have found that 4:1 works very well. Lots of power in low gear. If using sprockets, you can attain roughly a 4:1 ratio with an 11 tooth sprocket on whatever your output shaft may be and a 45 tooth sprocket (I think)mounted to the wheel or shaft that the wheel is on. I don't know if this will overcome your friction problems, but it might.

Cory