[Scottie]

tower hobby charges $18 to ship anything I bielive do get it from them, RCmart is pretty cheap and takes about just over a week to get to you but you local hobby shop whould be best they can haave it in 3 or 4 days or something if they don't have it in stock.

I have a DF-02 and its takes a different pinion pitch I think.

If you look in your book that came with your Sand Viper in the back it will give you a part # for the pinion then you can look it up on line and find the ones you need.

[Scottie]

I think the lower Teeth on your pinion the fast it will take off but the top speed would be lowered.

I did a search and someone was saying you could only use the 17 Tooth pinion I would google around for abit and try to find out more about it.