Well, the only thing that can change in regards to your tire size is the shift points and they're pretty easily handled with changing one parameter (tire revs/mile). 36 inch tires are going to be something that REQUIRES changing the tunes to a true "custom" status. Also your aftermarket valve body may require LESS changes from stock. You may be in for the F.U.2 package (all absolutely custom tunes). In either case, you will not need to send your chip back as both FU packages come with a burner.
Trust me, I had speedometer accuracy problems! I ran 49" Iroks on a 95 CC/LB Powerstroke and kept the 4.10 gears.
Your speedometer CANNOT be corrected through the PCM programming. The ABS module handles that.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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Wed, February 3rd, 2010, 05:42 PM
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