Originally Posted by savageintegy
i installed a super charger on my 4.6 its great but rounded the spur i am puttin a steel 48 tooth spur what bell shoul i run
The odds are that you didnt mesh it too well hence why you stripped it. And to be honest I'd stick with plastic spurs otherwise something else in the transmission will have to give way if things go wrong.
If you lengthen the gears you will put more load on your transmission systems so assuming you have more RPM now, it's best to drop the gear ratio and let the engine open up so to speak.
You can go here -> http://capricornrc.com.au/home-2/lab...ed-calculator/
for a speed and gearing calculator, just use first gear if you are single speed and change the values to suit your car and you should be able to find a happy place for the car's transmission.