I've read a number of reports on forums of people using cheap axles with decent results. When I discovered a torn boot and couldn't wait to order a GKN boot, I put on a $65 Carquest axle from Adv. AP. That was almost 2 years ago, and it's been working fine. I kept my old axle with a torn outer boot and plan to clean it up and re-boot it so it's ready when the cheapie axle fails eventually.

AM.

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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)