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I'm new to the forum. I have a F150 lifted truck I built myself. My boyfriend has the 2001 F250 7.3 powerstroke. I know NOTHING about diesels so I need some help.
He purchased a SCT programmer Saturday. The guy told him it would correct tire size which it doesn't. According to SCT the tire/speedo/gears are NOT controlled by the PCM but by the speed control box.
His stock tire was 265/75R/16's. He's only running a 315/70R/17 tire.
Is the tire difference a big deal? Was the SCT guy correct on the PCM?
As far as I know it has not been regeared. I think the stock gears are 3.73's.