Dana 60 hands down for your app.....ive owned 5 in my life 2 currently from dr.diff awsome piece at an excellent price.ive built 2 9" had alot of $$$ spent even on the one with low end parts.at end of the day have broken lots of 8 3/4s....and gears in the 9" never anything in the danas.my buddy has a dana60 in his 67camaro super stocker for over 25yrs bone stock mopar pass car rear running mid 10s with a BB on a t-brake.he finally broke the stock posi and bent an axle when he started runnin 9.20s.put a spool in it and axles and still goin strong today.their was also a gentlman on pinks in one episode i remember made a note of telling Ken Herring about his bone stock pass car dana60 in his 65mustang sbf stroker with a fogger 4spd jerrico running 8.90s.Ken said "bone stock"guy says YES axles posi and all the response was wow.