Just for reference, what Dave is talking about is a discussion I had with him about gears and tires. As I explained to him, our Expedition runs a 3.31 gear and we have 285/75-17 tires which come out to about 33". If you do the math, it's really close to a 3.55 with 35" tires, as far as RPM/MPH goes. We haven't had any problem form our Expy, which not only is undergeared, but also weighs more than the average F-150 and in fact I can stomp just about any F-150 in the area while breaking the tires loose from a dead stop.
What many folks forget is that the PCM operates on a load-based strategy. The higher the load, the more power it will allow the engine to make. This is why 4.88 geared trucks often fall short in performance when compared to 4.10 or 3.73 geared counterparts.
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
(678) 890-1110
www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
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