Quote:
Originally Posted by Saitin
12 bolts are good for 450-500HP after that you need a 9" a s60 is pretty much a race rear 1k+ hp.
and a general rule I've come to believe in is 12 bolts are for auto's and a M6 needs a 9" when launching over 5k with a built motor.
There is some one on here I can't recall there user/name but they have broken a 12 bolt 3 or 4 times within a year or so. mike iirc??
That is my 2 cents
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You can't generalize on the strength of a rear based on it's design style. It depends on its components. Any of them can be built to handle a lot of power, it just depends on what you put in it.
There is a big difference between a stock GM 12 bolt with 30 spline axles, a posi, and c-clips and an aftermarket 12 bolt with the tubes welded, 33 or 35 spline axles, no c-clips, and a spool. Just like there is a difference beween a stock Ford 9" with 28 spline axles, a WAR center section, and an aftermarket one.
I recognize that nobody puts factory HD rears in their 4th gens since they need to be modified first. But ANY of the rears should be able to handle what most of people will throw at it. Aftermarket support is good for all 3.