Droopy said:
OK, I'll tell you because you asked - You didn't hurt it, but don't make a habit of it!! At least not for another 265 miles or so.
Seriously, if the engine sounds fine, then it most likely is. From what's been previously posted, these trucks need miles to break in other parts like the clutch.
My first 500 miles were done mostly around town. Light throttle, always changing speeds, and TONS of shifting! I'm hoping this helped everything break in well and things will last.
*I may have squeezed on it once or twice in the first 500.