I've got a 04 4x4 F-350 6.0L and when i put my edge chip on extreme my tranny wont shift out of first and will just rev up. Would a shift kit help solve this? Any other suggestion that would help?

 

About the only thing that will solve that problem is to ditch the Edge tuner great gauges but there tunes are known to kill the trans, the only safe tune is SCT Xcallibrator3 W/ Custom Tunes By Innovative Diesel or Matt at Gearhead and a few others.
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My suggestion is to get rid of the Edge. It's the problem.

 

If you disagree with the above comments, start saving your penny's for a new trans, if it isn't already too late.