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I have 12.7 Detroit that broke the teeth off the crank gear and bull gear, replaced them both as a s

I have a 12.7 Detroit that broke the teeth off the crank gear and bull gear, replaced booth gears and 27000 miles later they broke again. gear lash was no more than .007 had good oil supply. read on the internet several people have had this problem but no real good solution.

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