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I asked about a 518 swap in a truck that I looked at and most seemed to think the OD unit would fail behind a 440 pretty easily.

How about running a 2.76 rear gear and spending the extra money for an OD on a supercharger or better heads or...

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Theres an awful lot of Cummins powered trucks around with O/D Torqueflites that live just fine...

Thats a 618 but the parts from a 618 & a 518 are interchangable...

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