I should also tell you that I found the torque damper to be pretty essential. I tested the replacement gear that I posted, and it worked--But the car didn't last long and literally all 4 axles broke. --I think I found a spring though, it should get here wednesday then I can update the files with the torque damper.
Additionally, I am unsure of how the car will hold up with those large tires. Have you driven it yet? the tires I use have an OD of 85mm