John Benson
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I have an 01 3500 4x4 Dually with an Automatic running 279xxx miles, same trans, pull a 32' travel trailer,I do run OD until shifting is a constant! I am up and down the East side (Adirondack Mt, and I live in AL in the foothills of the Smokeys so I do work it, I run a DD pan and amsoil fluid with no issues if that helps?