piginajeep
The Original Smartass
The Cummins with the manual is detuned significantly to make the trans live. In a 2500 the only auto is the 68RFE which is plenty strong if you leave it stock. In the 3500 you can get the Aisin trans as an option and the engine is actually higher output with the aisin. The aisin the just as strong if not stronger than the Allison. They are very similar transmission designs actually.
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Damn it. Detuned is a bad word.