ok here's what happened...I bought the car and was told it had 3.73's and, as I mentioned above, I have counted and the driveshaft spun 3 3/4 times for one tire rotation. I just put in the white gear (from Jeep, but I've heard it works and is stronger) and pulled out a yellow gear. Before, it said I was doing 100 when I was actually doing like 60-70, so I figured it was normal w/o the correct gear, replace gear and now this happens: 1st gear 2500 rpm=25 mph, 2nd gear 2500 rpm=35mph, 3rd I think was 50 mph at 2500 rpm...this is nuts! Maybe someone put a really high first gear in the tranny ha ha ha. Are the tach and speedo adjusted from the same gear or do they get their readings from seperate places?