Two problems related to universal joint have been reported for the 2003 GMC Sierra. The most recently reported issues are listed below.
2003 GMC Sierra manual transmission - slop or clunk in drive train. .
I own a 2003 GMC seirra 4x4 sle (ext) cab and the transmission is very jerky between first and second gear and between second and third gear also , but at times there is a cluck noise between second and third gear. Which sounds like a universal joint that is bad. First time I took it to the dealer they said they couldn't reproduce the problem. Second time they change the pressure control solenoid in thethe valve body, filter, and fluid in transmission. It worked great for @ two weeks and now it's back. There is a problem here . Two friends at work have the same problems with there 2003 GMC's and chevy's trucks.