Originally Posted by tjwood29
Im sure what the ratios are but it is a 99. How can i tell what the ratios are?
The factory installed a steel tag onto the differential covers at their 9 o'clock positions. Embossed into it will be your ratio... in your case it will say either "3 07" or "3 73" since they don't emboss the decimal point.
The below is indicating the axle has a 3.73 inside, look inside the red circle for the "3 73" stamped into it.
No worries if it says 3.08 or 3.74, the front & rear axles are .01 different due to their different ring gear diameters. Only the Rubicon's front & rear axle ratios match perfectly due to it having matching front & rear Dana 44 axles.