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Power Strokes
6.7 Aftermarket
2011 6.7l tunes
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[QUOTE="Stangr8cr, post: 994543, member: 13825"] I'm pretty sure those funky shifts are due to where the tc locks up in the SPE tuning. I have to go back to H&S box tuning for emissions yearly and mine did the same thing for a few drive cycles. Scared the hell out of me the first time but everything is fine. I am going to try Gearhead tunes next month to see for myself but I have no complaints with SPE, their Hot X tune is meant to be race only so I can't complain about the harsh shifts. I like what I'm hearing about the Gearhead tuning but for hard parts, SPE has great customer service as many vendors here, I've bought parts from Inmotion Josh, and Rivercitydiesel with great service as well. Keith [/QUOTE]
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