My new slash I bought pre-built came with the TA slipper clutch mod installed. What is the difference between the TA spur and the Traxxas one? The kit also came with a bunch of pinion gears for the supplied TA spurs that where included. I also have a stock slash roller that I bought and used one of the pinions on this rollers stock spur and it worked just fine. So now I'm confused? What is the difference between these spurs? How can I even tell? I also ask this because I'm trying to setup gearing and not sure what to do because I'm not sure if the TA tooth count can be compared the samevway as the Traxxas.