[enio45]

Are all gm 12 bolt posi carriers the same? Are they interchangeable?

Meaning, is a 69 chevelle carrier interchange with camaro?

I have a client who wants to go from his 4:10 gear ratio to a 3:73 ratio.

I'll need to swap out the carrier and ring and pinion and I need to know
what interchanges with what , in other similar GM vehicles.

On a second questions, what would a 3 series carrier posi and ring & pinion cost if
i bought a good used replacement?

Thanks for the advise