general problems of the 2003 GMC Sierra 1500

An accident has not occurred yet, but it something I'm concerned deeply about. Awhile back there was a recall on the instrument cluster of the GMC Sierra 1500 (possibly othets on the list, im sure). I did wind up having the cluster replaced, there didn't seem to be any issues at the time. Now. . . The replacement cluster has gone haywire. I notice no issues with operations at this time. But the cluster doesn't register certain things or it fluctuates on and off, or doesn't read correctly at all. Is it possible that the replacement could have been bad as well?.

Loud noises from left rear wheel, like a loose part, then a grinding sound. Suspect it was not fixed in recall.

My 2003 GMC sierra pick-up has erratic speedometer reading. Speedometer reads various speeds while vehicle is at a stop. Impossible to determine actual speed due to this problem. Gm issued a service bulletin and offered free replacement to all effected vehicles. No notice was sent to owners. When I found out about the service bulletin, it was too late. There was a time restriction on it. Apparantly my speedometer lasted a bit longer than many. However my problem is exactly the one referenced in the bulletin. I think gm should pay for the repair. The local dealer said it would cost me $470. 00. I've owned many vehicles, and never once has a speedometer failed due to "normal wear and tear. ".