hi GUYS well i have known about this for some time though not give it a shot myself but thought you guys could use the info for the more tec minded of you lol.. this is done on a cheap fisher price toy but iam sure the idea could be carried over to other toy grade r/c such as tyco and so on . any how check it out hope you guys find it usefull
http://www.instructables.com/id/Modding-Fisher-Price-72825-Formel-Junior-Fernlenkf/