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Thread: Dana 300 breakage

  1. #1
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    Dana 300 breakage

    Anyone else here ever break their d300? What have you broke and what was the circumstance or root cause?
    I have a few spare d300s and am debating the value or need of HD outputs.

    So far I have cracked one cast iron case and broke a front output shaft at the splines. Both of those breakages have been caused by driveshaft issues.
    The case was cracked due do a front shaft the was a bit too long and was forced into the case and prying it off the tranny.
    The front output was the front yoke binding up while too much travel.


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    I've seen one rear output break but that was also due to driveshaft bind (because of axle wrap...)

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    Ya, I still can't justify an HD output shaft upgrade because I can't find any breakage due to simply being a weak shaft. Every break I've found has another cause that in turn broke the output. IF you keep the driveshaft from binding, bottoming out or getting hit the outputs can take some serious abuse.

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    Broke 5 total, 3 in one weekend. All more or less power related.
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    Quote Originally Posted by k5 View Post
    I've seen one rear output break but that was also due to driveshaft bind (because of axle wrap...)
    The output mainly broke because I said, "one more try". the way I fixed that was to build a torque arm.
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