if you're buying them from vatozone, no wonder they aren't lasting.
Agreed lol my brand new $89 eBay altenator has proven to be the most reliable so far (compared to vatozone)
The Fleet...
2003 Suburban- 5.4 L59 331CI 10:5.1 Compression -Built by ME
2004 Avalanche- 5.7 LS1 -NOT built by me
2005 Silverado RCSB- 5.7 LS6 -Built by ME