I replaced both axleshafts in December 2002. I got 5K miles out of one of them before it went bad, and replaced it under warranty; it's got 10K miles on it now and no problems. The other is still going strong after a total of 15K miles.

Both were CarQuest axles, and given the price and the fact that they have a lifetime waranty, I'm not complaining...

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2001 VW Jetta TDI, 5 speed, daily driver
1991 Ford F-350, work in progress
1984 Ford F-250 4x4, 6.9l turbo diesel, 5 speed manual
Previous oilburners: 1980 IH Scout, 1984 E-350, 1985 M-B 300D, 1979 M-B 300SD, 1983 M-B 300D
Spark-free since 1999