Looks like you had some grip to break the pinion. BTW- regardless of whatever gear ratio you throw at it just keep in mind that it broke the pinion before any torque multiplication through the diff gears , meaning that any gear you use will be susceptible to this failure. I would look into a steel front planetary if you don't already have one. Allan G.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
