the mild 340 didnot blow the sprag what blew the sprag most likely was either a drive line failure or incorrect driving habits I see guys at the track pull in the beems and put the car in neutrel to clear the motor and then never roll the car far enough to reset the sprag or doing burn outs in first not 2nd like was stated above the key is driving proceedure and checking the sprag if you ever lose a drive shaft or rear gear.