Hi, I'm a new member with my first ford, an '86 Capri 2.8i (not the special). I noticed that when I was driving with a sat nav that my speedo is reading 15mph fast (85mph) when traveling at 70mph. Is it possible that a previous owner has replaced the rear axle with a slower final ratio one? The car has 15'' wheels but low profile tyres so they're not to blame are they? Anyway, reason I ask is that I need a new rear axle and was hoping that a 2.0 Atlas would be suitable (I can always get around an inaccurate speedo). Cheers.