I had a 2500 for about 10k miles before trading it off on a 3500 with aisin. 68 shifts nicer while not towing, 2500 was 2.5 m/gal easier on fuel , and probably would have done me just as good as a job as the aisin. I had the money to spend on the upgrade so I did. Would I I do it again, probably, but the added cost and fuel consumption when empty would be something for me to consider. Reason for the trade was a front end issue that FCA refused to acknowledge and nothing to do with trans.
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What year 2500 & what was the issue?