Steel vs aluminum suspension parts

[kschachn]

stamped steel is always a low cost solution, that’s the only benefit

think volvo s80 to ford taurus and mercedes w220 to chrysler 300c

The ones for the BMW were cast or forged replacements. The problems weren’t really with the arms themselves but the quality of the bushings and ball joints.

 

[The Critic]

I wasn't going to put new and expensive liquid-filled bushings in arms with 20 year-old ball joints.

That depends on the application. My Toyota is on its 3rd set of lower control arms but still has the original ball joints at 225K.