Stuck in Commiefornia...
Join Date: Dec 2008
Location: Clearfield, Utah
Thanked 447 Times in 315 Posts
Aside from proper tuning, which is really a must have, you probably ought to consider more gear, 4.30s, 4.56s, or even 4.88s Get the RPM in overdrive up in the range of 2200-2400RPM at 55-60 with the small 32" tires. Then you can always jump up to 35-37" tires when your not towing if it's lifted a bit and keep the RPM down.
The F-550 I drive at work has 4.88s, and it needs them to move, but the poor old 7.3 turns 2500rpm to do 65mph. I doubt that 7.3 will see 500k, but at least the truck can move it's 20,000lb self and a trailer as needed.
The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan
7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4
6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4
6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift