I have a 87 yj there has been a lot of work done to it be for I got it. Its got dana 44 in front and dana 60 in the rear and running 35 inch tired. Trying to figure out what gears I have in it. My speedo is off by 20 mile hr . I'm going 70 and I'm really going 50 and my rpm are still good at 2 g...