The stock axle is American made steel, the new one is Who knows what! The stock axle is heated and bent, the new axle is made that way. Its a tough call, whats the warranty like on the new one? Whats Sids warranty? What are the shipping costs? Both will get the job done. If it was mine, I would go for a stock axle, I just feel better about using a GM product even if it is altered. Axle have been heated and bent for a lot of years, and you don't hear about a lot of them breaking. Ask over on the Jalopy Journal site, they do a lot more dropping then on this site, theres even pictures on how its done if you search around.
http://www.jalopyjournal.com/http://www.jalopyjournal.com/forum/forumdisplay.php?f=5
