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I recently did this job on mine. its not all that hard, there is an excellent write up on the forum. with boatloads of pics. Bluewasp was the one who did it I believe. very helpfull.
I will second the opinion of buying the moog balljoints, I bought the cheap ones and they are too large to fit in control arms, bought the moogs and popped right in.
The reason why some ball joints are larger is the hole the ball joint gets pressed into can elongate. Or get larger from pressing in/out ball joints. Or from pressing in a ball joint crooked. So they make some ball joints that are larger to accommodate a larger hole.
Though, I don't know if C4's have a problem with that hole getting larger. I know on my Firebird, I've had the ball joints fall apart while going down the road and the control arm was laying in the road. And recently I jacked up the control arm, and the ball joint popped out. So, that means the hole was enlarged. I could of tried a larger ball joint, but who knows how long that would last. So, I got a control arm from the junk yard and plan to press in a Mood ball joint.
Considering their normal shop rate is $100/hr and I had already farted around with the hand press for 3+ hours the previous day - $60 was a bargain. Additionally, they're a busy shop and I walked in that morning without an appointment and picked up the finished parts after work that day.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.