Diesel tech Q&A
 

Aisin vs. 68RFE QUESTION: I’ve been thinking about buying a single-rear-wheel ’12 Ram 3500 with the high-output 6.7L Cummins engine, and I’m wondering if it comes with the Aisin six-speed automatic transmission. Also, what’s the difference between the Aisin and the regular six-speed transmission? Willy Sandborn via email ANSWER: No, the ’12 Ram 3500s were

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