I'm running 35's with 4.56 gears,Got most of my low end back, I recommend 4.56's but its all up to you... I also got an EDGE Evo II , mainly to change tire size and gear ratio for the speedo.... But It doesnt work on my 98 F150 ... A little bummed about that.. Wasn't sure how far off my speedo was untill I had a friend next to me on the freeway doing 65 and I'm reading 70 on my speedo and the lower speeds I'm only off by 1 or 2 mph, not sure how to fix it...So I set my EDGE on level 3 here are my settings:

WOT 1-2 5250rpm
WOT 2-3 5250rpm
WOT 3-4 4800rpm
REV. LIM. 5650
STD SHIFT (1-2) +2 and (2-3)+3 and (3-4)+3
SHIFT FIRMNESS +12 on ( 1-2, 2-3, ) +10 on ( 3-4 )
WOT FUEL 140

I run 91 octane so I dont mess with timing settings....... ANY ONE WANT TO SHARE EDGE SETTINGS WITH ME FEEL FREE TOO...

Robert Currie
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1998 F150 Supercab Flareside Lariat, 5.4, 4.56 gears, Truetrac Diff, 35'' Pro-Comps W/ Pro-Comp Wheels, 7.5 Fabtech Lift, Fiberglass Front Fenders, K&N Intake, Flowmaster, Expy Center Console, 7000K headlights W/ Clear lenses, Clear Corners, Tint all around, Edge Evolution II ...

NEXT MOD: Kenwood 717DVD, 2 Kenwood Amp's - Mono 1100 Watt and 4ch. 850 Watt, 2 Pioneer Shallow Mount 10'' subs, Music Moose Box, 2 pair of Pioneer 6x8 4way's (Door and Rear Speakers)-All this stereo stuff is in my room waiting to get installed, no time right now to install it myself...