I used a Hypertech Power Programmer III on my '01 2500 HD 4x4. Both
performance and mileage increased significantly. The increased firmness for
the shift points also helped for towing and transmission longevity, as well
as speedo recalibration for increased tire diameter (285's). Definitely
recommend it. I found mine used (almost brand new) in the Recycler
classifieds. Hope this helps.
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