The OPs truck has a Getrag which is where my advise was directed. The only things I know for certain about the NV5600 is that it was only used by Dodge for a few years and it is a very expensive transmission to repair. My advise is purely cautionary and is drawn from the experiences of other Cummins owners on other boards. If you hurt or destroy any manual trans in a cummins powered truck, it will very quickly eat up the value of any fuel savings you had realized.
Travis..
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