Confused about Axle Ratio
I am looking to purchase an R/T Auto trans with 20" wheels. Please clear the confusion for me because I keep getting differant answers. I am under the impression that if you get an R/T auto trans with 18" wheels you get a 3.06 axle ratio. If you get an R/T auto trans with the 20" wheels you get the 3.92 axle ratio. If you get a manual trans with 18" wheels you get a 3.73 axle ratio. If you get a manual trans with 20" wheels you get the 3.92. Is all this correct or am I missing something. Also does posi rear come with the 3.92 ratio on both the auto and manual trans. thanks