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They both work well but tuners make the shifts firmer by raising the line pressure in your transmission. It can lead to premature transmission failure. For that reason I prefer mechanical shift kits. I have a Factory Tech Separtor Plate kit which is basically the same thing. It is just OK. I went through a huge hassle just to get what I wanted. Do a search if your interested. Knowing what I know now I would get the Transgo shift kit or the reworked valve body from Troyer.
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2003 F150 4x4 FX4 (White): 5.4L, Custom Tuned Gryphon Programmer, DIY Air Intake Mod, True Duel Straight Pipes With X-Pipe, Factory Tech Separator Plate, F250 SD Trans Cooler, Digital Trans Temp Gauge, Timbren Rear Suspension Enhancement System, Mag-Hytech Rear Diff Cover.
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