5.3L & 3.73'S

[CELLARDWELLER]

I've been driving my 2006 GMC Sierra for about 2000 miles. It has the 5.3L V8, 3.73 gear ratio, crew cab, & 17" wheels. I had a 2003 Sierra with the same engine,rear ratio, in an xtra cab. The 2006 is not fully broke in, but it doesn't have the engine response of my 2003. The '03, with just suttle foot input will just about haze the tires right from the get-go. The '06 isn't the same. Lots more foot input to get the truck moving. What's causing this? I'm always curious what changes are made from year to year, and hope I'm not disappointed with them. I love this truck in every other way, but started questioning things like, are the gears in the truck different from the window sticker?? Will the combination really change once the engine is broke in?? Can anyone share some input here?

Thanx; "The Cellardweller"

[05Quadrasteer]

I would say it is most likely the PCM programming. Many discussions around here about how GM has restricted the power you get when you hit the accelerator. Over at Fullsizechecy.com there are some stats on this subject.

 

From my experience the only way to get the power back is with a custom tune.

 

Have a nice day.

 

Bill