New Chevy 4/8 Motor Problems

Hi too all! I am a new member, and this is my first post.
I have a new 2007 Silverado crew cab, with the new gas 4/8 motor. thats the motor that shifts from 8 cylinder to 4 cylinder when it does not need 8 cyl power.
I have been hearing horror stories about the motors breaking the crank, but so far I can not find any good information on this. Do any of you experts have any knowledge about this problem?

Thanks in advance!:runaround: