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I went with the smarty on my 2006 dodge dually 4 door 4x4 diesel and I love it. I will recommend you check your band adjustments on your transmission, and service it. Mine started slipping after I put it on #9 setting. I adjusted the bands and it works pretty good for now. I know I will have to rebuild it soon because of the front band is adjusted to the limit now. I have also found out that the band struts are bad about bending and they make billet bands and struts.
Another vote for the Smarty. Reason why I say this is because it has more precise control of the tuning parameters than other downloaders on the market, especially the Bullydog. Another thing that I've noticed with other tuners is that it makes the truck's throttle more sensitive and the Smarty is the only tuner on the market that can tune that out if you choose to do so. Plus the Smarty doesn't leave a footprint on the ECM like other tuners do.
back when i used to be addicted to my diesel i made 703 at the wheels with my smarty among other things. The smarty will make the most power on a cummins hands down.
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2001 2500HD extended cab long bed. 6.0 procharged D-1SC, 6" RCD lift. on 35's.
im runnin bully dog and will be buying a smarty as soon as i get my trans rebuilt smarty ftw times 10
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2005 dodge ram 2500 cummins with 5" turbo back k&n quadzilla boost fooler and a bully dog power pup full piller of isspros egt boost and trans temp airdog 150 wicked diesels stage II cp3 and alot of black and white and a stock trans that slips all the timehttp://i270.photobucket.com/albums/j...ewtruck076.jpg