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UAWDIESEL 09-08-2003, 10:00 PM I have a 2002 Crew Cab 4/4 duramax - allision and I'm putting 285's on my truck . I would like to know if this will effect my trans & spedo .http://www.dieselplace.com/forum/smileys/Cool.gif GMC-2002-Dmax 09-08-2003, 10:09 PM About 5-7mph slower than actual . I ran 285' and at 62 I was going 69 mph. GMC. Buy a Predator or Quadzilla and recalibrate. bybycop 09-08-2003, 10:21 PM I put 325/60R18 and According to my GPS it was 4-6 mph off. One reason Im going with the Quad Stealth Mike DMAX2DAMAX 09-09-2003, 01:00 PM I just used the Quad Stealth to recalibrate for the 315/17's and it was oh so easy! Oh yea, I added a few horses too while I was at it!http://www.dieselplace.com/forum/smileys/Evil Smile.gif http://www.dieselplace.com/forum/smileys/Evil Smile.gif Quadzilla folks were great to deal with and the instructions were real good too!http://www.dieselplace.com/forum/smileys/Clap.gif 2DAMAX | ||