Just wondering if there has been any updates to this problem? I have just replaced the water pump in my 2003 and have a noise coming from the engine, sounds like a bad bearing and doesn't start making noise until the engine almost reaches normal operating temperature. I did use a new gm pump kit and of course I never looked at the gears!
I also replaced the drive belt, idler pulleys and tensioner bearing so those items are good!
I can't believe that I need to tare into this thing AGAIN!
2003 GMC SLE CC SB 4x4 D/A in summit white. High idle, Pre OEM Racor 660, Autometer pyro/boost gauges , Edge/Attitude R.I.P., now its a PPE Xcelerator, Banks ram air with super scoop, Banks monster dual exhaust, J&J Millenium Boards, Line-X, Cloud Rider Mud Flaps, Bug Deflector II.