Question about gears
Does anyone know who makes 3:90 gears? I saw them somewhere before but can't remember where. Also I used to have an 85mph speedo but I put reverse glow gauges on and took it to a place by my house to have it changed to 140mph but it's still 5 mph off, so if I get a 3:90, or end up getting a 3:73 what should I do to make the speedo accurate?
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