[grahamp]

Ratio on the window sticker was 3.55. I think the replacement is a higher ratio and closer to 4.00 since the rpms are very busy! This is what prompted me to take a closer look at the rear end. I tried to calculate by counting the prop shaft turns to one turn of the tire, came out as two to one which is certainly not accurate! Probably because I have a posi unit and had the other tire on the ground , I think both tires have to be free to turn? So will try that, and in extremis, I will remove the differential back plate