I blew the rear in my k5 last thursday with my 9 month old daughter in the truck. I was turning onto a street. No one was hurt. She slept through the whole thing. Luckly I still had the rear and front from my dads old truck he gave me. But when I was setting the stands up I squashed my pinky at the tip. Big ouch. Put me out of commishion for about 2 hours. Still needed to swap rears. Anyways, I swapped the rears. I took a look at the blown rear and found a whole bunch of teeth. Along with the teeth was a broken end cap bolt. Which is what I think caused the breakage. When I put the rear together the pattern on the gears on both drive and cruise was perfect. In the end everything worked out. Just glad only the rear broke.