On the 7.3L (and subsequently, the 6.0L) we can usually compensate for any combination of tires and gears buy modifying the tone ring counts and tire revs per mile. It's a bit tricky as it requires a little fudge work on the math, but it usually works out okay.
We can make adjustments in the tuning to handle shifting concerns, but do not have the capability of correcting the speedometer as that handled via ABS... as Southpaw indicated. So unless you've already adjusted the ABS to correct your speedo, there's really not much we can do about it other than fix the shifting.
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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