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Don had a aluminum drum in the trans, last outing he sheared the pinion teeth on the 4.10 dana 60, broke the tailhousing and bent the main shaft, trans was repaired, gear replaced and sprag checked, 2nd run after was the explosion. He is still in the hospital, broke several bones in his right foot, they were going to decide today whether to amputate 2 toes or try to save them.

I am curious as to why this alum drum failed.

Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.