Yes. If you're running the canned tunes, you'll need to complete a programming session and include the tire size and gear ratio options. MAKE SURE YOU DO BOTH. Don't just do the tires and skip the gears or you may end up with your speedo off a bit.
Take care.
__________________
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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