Every time I buy one at Pep Boys or Auto Zone it seems like I get nothing but crap. The last one from Auto Zone only lasted 4,000 miles! I've been through at least 6-7 alternators on different cargo vans which have not lasted long at all. They replace it for free under warranty, but there's still the hassle of breaking down and having to take the thing back, and sometimes I am 400+ miles from home. I have one going out as of this morning, but it's the original on this particular van and I am at 120k miles. If I could get that many miles out of a new one I would be one happy guy! I guess this is a venting more than anything, but if someone could suggest some good alternators, that would be great!