what are the strongest gear's I can buy?

:lol:

Just make sure you order the street gears. Some race gears are not made to handle the heat generated on sustained street use and can become brittle. It will be interesting to see just what broke inside the carrier. It may not have been the gears.

Since you basically have no traction on the street I would think that the wheel hop is the problem. It would be pretty violent through the shift.