I am looking for either a 3.07 or 3.42 gear for my 65 c20 with powerglide and 10 bolt rear, and I will trade or buy outright. I have a 4.56. I need more high end speed and less whinning.

What are you gonna do with your 4.56's? I've got a 79 blazer with the 10 bolt that I could put them in! Brad

Is the 12 bolt only for a 1\2 ton in my 63 I believe it is stock,im just learning yours is a 3\4 ton I have a 4wd rear end?????tell me what you need so at least I know

i need to find 4.10 for my eaton FF axle so i can dump the 4.57 out of it,,.

you guys should post what axles you are working with, dana 60 or 12 bolt or eaton FF or what..