I have been emailing them and i have not had a response from them I own a rockslide super class and the diff spur gear stripped in the center because it is plastic that should definitely be metal to be able to pull that weight up and down ever since I did the dual 2000mah nicd batteries the power is insane but the spur gears can not handle the load of the rig and I'm not talking about the outer gear the part that usually has a diff cup but instead it has a solid bar diff with a plastic gear, they has been out of stock for 2 weeks now so I'm gonna assume that they are aware of this problem but I haven't gotten a response from them at all I am disappointed in them. I hope some one from redcat see this and emails me back....I've also called their number from their site and the mail box is full and no answer....what is going on with this company?