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Welcome dflahe, I found a technical bulletin.
Make: CHEVROLET
Model: CHEVROLET TRUCK
Year: 2003

Service Bulletin Number: 031803
NHTSA Item Number: 10001891
Summary Description:
A CLUNK NOISE COMING FROM UNDER THE HOOD THAT ALSO CAN BE FELT IN THE STEERING WHEEL. *TT *JB
Service Bulletin Num : 031803 Date of Bulletin: MAR 18, 2003
NHTSA Item Number: 10001891
I hope this helps you. BTW It says something about replacing imtermediate steering shaft, check with dealer.
 

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The TSB was revised last year. What they do now is remove the intermediate shaft and use a grease pack in it. It works for a few hundred miles if you are lucky. I would ask them if they do the grease kit again what they will do if it doesn't work. When I worked for GM my dealer would do the grease kit twice then replace the shaft if it failed a third time. My 04 and 06 Silverado had the same noise and I ended up replacing the shafts. Hope this helps.
 
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