My personal feeling is that it'* a combination of 2 factors:
1. Pontiacs and the 3800'* in general run high temps under the hood.
2. The Alternator design doesn't lend itself to a great rear bearing design. Aftermarket solutions like DP'* alts solve this problem. Time will tell. We've got about 5 of these alts running here on the club now.
Location: New Jersey - Most of Our Elected Officials Have Not Been Indicted
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I feel lucky that I had to replace my alternator just ONCE at about 65K. I bought mine thru a local rebuilder of alternators and starters. It seems to me that the reason that some remans fail faster than others is becuase some rebuilders ONLY replace the failed component. So they may replace a diode(or two) and not replace the bearing. So who or where you buy them from Does make a difference!
So i just fofund out as i puled my old alt that it says "ACDelco Reman" do they remanufactuer alts for new cars? if not then im not on my first altrenator. Im getting a brand spanking new 140Amp lfetime warrenty alternator from KOI Autoparts (not reman.. WOHOOO).