The rear axle that was in my 68 C20 with 327 and a SM465 was a Dana 44 with 4:56 ratio. I replaced it with a Dana 60 out of a 73 with a BB and an auto that had 3:73 gears.

Here's a rear axle identificaion site.

http://coloradok5.com/axleguide.shtml

Larry


I don't own a vehicle that isn't old enough to drink.