I have 2 Mack GU813's quad dump trucks running MP8's and Mdrives. 1 of them pulls a tag trailer occasionally and the other one almost never does. The one that pulls a trailer more will be on its 3rd trans now, and the other has its 2nd. Both are around 400K miles. Ive had good drivers in them the last few years. Why do these trans keep failing so early?
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