The weakest link in the truck 12 bolt is the pinion diameter at 1.4". I've snapped mine twice now on the street playing around. Just the grunt of the engine and loafing around a 4,960 lbs. 4x4 blazer takes a toll on it.
Passenger car 12 bolts have a 1.625" pinion so you never see this problem.
I'm looking for a semi float 14 bolt to drop in now for a little more strength so I don't have to keep driving it home in 4hi on the front axle
