how did he ruin the differential by doing a 90* ?

 

at what speed was he turning that it would ruin it?

 

we were headed west
he makes a square left at WOT,
and the *** swings out
so we're moving south, but facing east
he countersteers, and we're facing west, moving south
countersteers again, and the nose again faces east,
which means the rear is swinging out to our right again-
right into the curb.

the wheel hits the curb and cracks,
punctures the tire (nitto drag radials!!!)
pushes the wheel into the car, bending the axle,
sending the axle into the posi and probably gears,
screwing up the case as well.

now he's clearing rooms in the middle east