I am back at it again with this lol. I installed my 315/70/17 back on and well I have the gryphon at 2880 for tire size. Yet the speedo is off by 4mph again. So what size should I try? I played with it for 30 mins last night and nothing seem to change. I am using my gps to calculate my actual speed. That and when I have it set on 65 cruise control people in the slow lane are passing me. So I do believe the gps is accuarte and the speedo is off still. Any help?
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2007 Supercab few mods here and there
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