the dana 60 is faster and stronger than a 9 in. the popularity of a 9 is being able to change center sections faster. the popularity is why gear companys have more ratio selections. you all have to remember it is not horsepower that breaks driveline parts, its all about car weight. a 500 hp car at 4000 pounds will break more driveline parts than a pro stock car will. if pure strength is all you are after and are not going to change ratios dana 60 all day long my car has had the same gear in it since 1999 when the car was built and that is using a trans brake too. it will 60 ft 1.33 at 3360 pounds