Brad, the ratio of my stock A833OD is 3.09, 1.65, 1.00 & 0.73.
My Passon HemiOD is 2.65, 1.55, 1.00 & 0.80
like it was already said - try the stock OD unit first as they are dirt cheap and give you an ideaof what you aregetting into.I can say though at 3.73 ratio in the rear, I would not want any lower ratio. 3.91 would be great if you are using an 8-3/4.