ok i have a ofna pirate 10 and i locked the diff. do this and u wont go wrong because i wore down the stock tires less than a week because of all the power going to the front. so i got soem new dirt hawgs and decided i had to do somethign about that diff. take it apart and put the gears in different spotsif u do it right u will see that the gears toutch each other and wont allow each other to spin. it never gave me any probs yet and ive been through 2 engines. plus u could always fix it how u had it if u decide u want the diff to work. just fool with it and something will come up.