I was getting my truck dyno after swapping my 5.3 to 6.0 and on the first full throttle pass my drive shaft broke at 5100 rpm. The good new is, i guess is i made 360 ft lbs and 310 to the wheel. I still in to go back and finish the tune. How do those numbers sound?

 

is it a stock 6.0? What is done to it?

 

just no cats and a flow disaster

 

I think they sound great for a 6.0L, especially if it is a LQ4. You will see higher HP once you get another driveshaft, the GenIII motors build power up near 6000rpm. At least it wasn't the tranny, they usually break before anything.
Congrats!

 

the tranny housing broke