what are the strongest gear's I can buy?

I have Richmond gears in mine now. The car weighs 2770 with driver, currently launching at 3600rpms on the 2-step, with converter flashing to 5000rpms, with a trans brake.. Also ran Richmonds in my old car. the only time that I had any trouble with a ring gear, was about 8 years ago when I used one of my other cars with a 4-speed, and slicks. I was side stepping off the clutch at the starting line at 6ooorpms, the ring gear didn't like that!! Only lasted about 20 passes untill I nocked 2 teeth off the ring gear!!