I have this programmer that I had on my 06 Dodge Ram 4.7L. I'm pretty sure it works with several other models, but I'm positive it works with 04-06 Ram with 4.7L. Model #3865. I used it for about a year on my truck but sold the truck. It had a significant gain on the performance setting, and seemed to help on the towing setting. Never got a chance to try the fuel economy setting. You can change the trans shift points and tire and gear ratio settings to fix speedo issues. Also can read diagnostic codes.
I tried it on my wife's Grand Cherokee 5.7L Hemi, it wouldn't accept the tune, but was able to check diagnostics and stuff on it. It may just need to be plugged into computer and updated, just haven't tried it.
Paid around $300, asking $150 obo.
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