My '04 2wd has started making a knocking noise under the dash. It is almost like the steering column is loose or something. I am concerned it may be something with the front-end, but it sounds like it is coming from the inside of the truck. My buddy has an '04 Avalanche that is starting to do the same thing.

 

just do a quick search for "steering knock" or anything like that. i have the same problem with my06' 2500HD22,000 miles. its the steering (knuckle i believe) the grease works out of it and has to be re-greased or re-placed.

 

Here are 12 TSBs on your one problem - Christ...
1.)TSB #000235003 -- CLUNKING NOISE UNDER HOOD AND CAN BE FELT IN STEERING WHEEL. *EH UPDATED *EH (NHTSA ID #10012089, FEBRUARY 01 2006)
2.)TSB #000235003G -- CONCERNS THAT CLUNK NOISE CAN BE HEARD COMING FROM UNDER THE HOOD ALSO FELT IN THE STEERING WHEEL. *TT UPDATED *EH GM ADMINISTRATIVE MESSAGE. *TT (NHTSA ID #628884, APRIL 01 2005)
3.)TSB #030235006 -- REVISED STEERING WHEEL REPLACEMENT PROCEDURE. *TT (NHTSA ID #10005165, DECEMBER 01 2004)
4.)TSB #000235003E -- CLUNKING NOISE UNDER HOOD AND CAN BE FELT IN STEERING WHEEL. THIS BULLETIN REPLACES PREVIOUS BULLETIN 00-02-35-003E. *TT (NHTSA ID #10011223, AUGUST 01 2004)
5.)TSB #000235003C -- CLUNKING NOISE UNDER HOOD AND CAN BE FELT IN THE STEERING WHEEL. *TT (NHTSA ID #10004716, APRIL 01 2004)
6.)TSB #01634 -- INTERMEDIATE STEERING SHAFT SERVICE KIT. SERVICE VME. *TT (NHTSA ID #10007231, JANUARY 01 2004)
7.)TSB #00299A -- NOISE FROM STEERING AT LOW SPEEDS. *TT (NHTSA ID #10007570, JANUARY 01 2004)
8.)TSB #01634A -- SUPPLEMENT TO 00-02-35-003D - CLUNKING NOISE UNDER HOOD AND CAN BE FELT IN THE STEERING WHEEL. *TT (NHTSA ID #10007276, JANUARY 01 2004)
9.)TSB #030236002 -- REVISED STEERING WHEEL POSITION SENSOR OR STEERING SHAFT LOWER BEARING REPLACEMENT PROCEDURE AND STEERING WHEEL POSITION SENSOR CENTERING PROCEDURE. *EH (NHTSA ID #10012577, AUGUST 01 2003)
10.)TSB #000235003B -- CLUNKING NOISE UNDER HOOD AND CAN BE FELT IN THE STEERING WHEEL. *TT (NHTSA ID #10000950, JANUARY 01 2003)
11.)TSB #201201 -- SUBJECT REGARDING STEERING CLUNK NOISE. *TT (NHTSA ID #629649, DECEMBER 20 2001)
12.)TSB #171201 -- SUBJECT REGARDING STEERING SHAFT CLUNK CONDITION. *TT (NHTSA ID #629629, DECEMBER 17 2001)
See Link Below
http://www.carcomplaints.com/Chevrolet/Silverado/2001/tsbs.shtml
This is why we sold our Dlrshps and why I left GM...
GL
Greek