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Hi, I'm a new user, my grandpa has a 1957 Bel-air 4dr sedan with post, just recently got car running and driveable, next on our list is to rebuild front end, and have questions bout the ball joints, what is the difference between low dome and hi dome ball joints, not sure which one's we have
 

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Huh? Never heard of such a thing.

What you need are upper and lower ball joints (2 each). I've got Moog K670 and K6034 on my '57, and they fit just fine. Rockauto.com has the best prices.
 

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The originals were the "high dome". Replacements come either way. There is no functional difference on an original car. The extra volume just ends up containing more grease. Some aftermarket wheels will interfere with the high dome ball joints.
 

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Welcome Tom.

If you want to be 100% correct install the high dome ball joints, but you might pay more for them. The low dome ones are less expensive but work OK.

My family comes from Summerville, whereabouts are you in Charleston?
 
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