Hey guys just bought a 91 pick up with the 3.0L v6 manual. I just put some 195/50r15 tires on it and now my Speedo reads 120km/h when I am actually going 100km/h. I believe the truck has 3.07 gearing in it right now and I found a set of 4.30 gears. I was wondering if I put them in if it would effect the speedo?