Join Date: Sep 2008
Location: Fort Bragg, NC/Buff, NY/Midlothian, VA
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If anything the bigger tires are giving you more like a ... 3.23 or 3.00 gear, for instance. Not exact, just giving an example. Although, I never like the ideas of 3.73's in a diesel built for towing. They seem too high.
But the speed that your speedo will be off is linear; ie a 7% variation.. 10% variation. My 35's are something like 10% bigger than stock, therefore my speeds will be 10% off. So by 50mph, I'm 5mph off, and by 100mph I'm 10mph off. Usually I multiply my final fillup by .10 and that gives me a more accurate number that I've experienced between stock, 33's, and 35's.
Last edited by 85_305; 09-10-2012 at 06:07 AM.