TracNBlack, My 96 blazer had to have it's alternator replaced after 31K miles. Sure, not over a $1000 repair, and still under warranty, but the service tech said: "Yup, 30,000 miles, that's about right...and better than most!"
Seems there was a dry bearing problem in that alternator that causes it to overheat and the heating caused a voltage reg to burn out. A very common problem.
But, like most American car companies, Chevy in their infinite wisdom figured "why change it...the consumer expects little things like this!"
Or, the head gaskets the blew in my 89 GMC S-15 at 55K miles....I babied that thing. Same vehicle as yours. Poor design...gaskets in the heads too thin.
TJR