BosMobile

i know ,i spent all day in the junk yard looking for a posi carrier[for 7.5]took my trusty ''note book'' full of rpo codes,lists of possible donors,[s10,jimmy,blazers,astro,f-bodies].still didnt find a posi!?am i missing somthing here?are they that obscure?...i found the 3.42 ratio,alot.[thats what i want]so ive got the gears now.what now,please bless me w/some answers.thank you,BO