[Shark413]

Matthew_Armeni, I assume thats what caused the problem. I was not running mechanical brakes in the rear that day. Motor brake for the rear (motor/pinion to spur) and I was running the mechanical brakes in front. In this setup when the brakes are applied, even if there is an inbalance in stopping power between the front and rear the center diff will compensate and give a little, so the front should be isolated from the rear. So I believe the motor brake locked the rotor (or nearly locked it up) and when I came down hard after the jump the force transferred up the drive train to the locked motor and the pinion gave out. I ran mechanical brakes front and rear for several months and never had an issue with gears breaking like that. With a pure mechanical brake setup the motor freewheels (neutral) when the brakes are applied and the brake servo (3rd channel) applies braking force to the brake pads/rotors, so no stress on the motor/pinion/spur at all. I know most of you (conversions) are running motor brake only, what percentage (brake %) are you running? 50% is default and I was running 75% when the pinion gave out.