6 spurs in a row....

I know that plastic spurs can strip from time to time, but Id bet you have something else going on as well. Maybe a bad bearing in the center trans, or your motor mount screws are not holding the motor in tight.

but it is possible to use the shockwave single speed in the tornado.

You might find the info if you do a search in the redcat forum. I know its been mentioned before what parts are needed.

but id check over the other parts 1st, as something else must be contributing to the spur gears failing like that.