Basically with steel there is a point where if the loads it sees are under the limit, it does not cause any fatigue on the part. Aluminum does not have this limit. Granted, you can build an Al arm so beefy that the fatigue life is well outside what anyone could reasonably reach, but I doubt anyone making Al control arms has done that analysis. There's a reason SPL and Powertrix only use steel.
-Dan
"Capitalization is the difference between helping your Uncle Jack off a horse, and helping your uncle jack off a horse." "'she' also likes to swap since I think I am going to need to give her to woody again." - Dvlhntr "full alphabetic boost mode" - ChristopherTheOne " Purrs like a sexually satisfied black panther." - BigTDogg "Two oil eating, angry, spinning triangles of death." - turtleboy on rotary engines
