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Re: Ball joint design??
Posted by S Carlson [Email] (more from S Carlson) on Wed, 29 Mar 2017 10:51:16
In Reply to: Ball joint design??, Saabboy, Tue, 28 Mar 2017 08:42:39
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Many people swear the one-piece joints are stronger, especially because the ball is mainly pushed into the socket by the weight of the car, since the springs are on the top. I don't know if they are or not, but that's what I've always heard.
The one-piece joints are smushed together around the orifice from whence the ball shaft protrudes, probably with large forging dies. I know this because I have seen a one-piece joint also shot to hell, and the ball definitely could not be removed, despite having no lubrication and about 1/4" of play.
European cars often had the spring on the upper control arm (a Jaguar invention, I am told), so the ball would be pushed into the upper joint. American cars often had the spring on the lower control arm, so the ball would be pulled out from the lower joint. This difference probably is the reason for the one-piece joints being called "Euro-style" and made by people like TRW, while the ones like the Moog one you have are referred to as "American-style".
The one-piece joints are therefore probably better for Saabs, at least on the upper control arm. The lower ones seem to fail more, but probably from lateral loads. Who knows which style is better for those.
posted by 65.112.10...
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