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Old 11-12-2017, 07:11 PM   #1
Kevin Mac
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How much is too much (lower ball joint interferance)

I have been working on replacing all control arm bushings and ball joints on my G body front clip. Everything was going fine until I tried to install the lower ball joint. It has .020" interferance and it just seams like it is too tight to go in the hole. I bought Moog parts thinking they would be good. I think .010" would be plenty for interferance fit. I may run a flapper wheel in the hole to loosen up a touch. What do you guys think?

Thanks Mac
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Old 11-12-2017, 08:09 PM   #2
HUSSEY
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Re: How much is too much (lower ball joint interferance)

I can't comment on what the proper interface should be I experienced what you're experiencing. I also used all Moog parts to redo the front end on my S10 chassis swap. I had the control arms out when I went to put in the lower ball joints and they were a mother to get started and fully pressed in. I was using a ball joint press which looks like a big beefy u-clamp. I could only get them in so far with the control arms off the chassis with an impact. I had to put the control arm back on and use a long breaker bar to get the joints fully seated.
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Old 11-12-2017, 08:21 PM   #3
Kevin Mac
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Re: How much is too much (lower ball joint interferance)

Wow. I went to parts store and measured a Moog and a cheapie and they both measured the same as mine. I need a press!! Thanks.

Mac
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Old 11-12-2017, 09:33 PM   #4
dwcsr
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Re: How much is too much (lower ball joint interferance)

Quote:
Originally Posted by Kevin Mac View Post
Wow. I went to parts store and measured a Moog and a cheapie and they both measured the same as mine. I need a press!! Thanks.

Mac
The aftermarket are larger because you press in and out the originals and that stretches the hole somewhat. .020 is to make sure you have a tight fit if the hole is stretched. You always press them in, you can knock them out with a hammer or put them in with a hammer your a frame is bad
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Old 11-12-2017, 11:28 PM   #5
MiraclePieCo
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Re: How much is too much (lower ball joint interferance)

Always sand/grind on the item that easiest/cheapest to replace. IOW, grind on the bushing, not the control arm - grind on the tie rod end, not the spindle steering arm. I learned this lesson by having to buy new control arms.
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Old 11-13-2017, 12:16 AM   #6
Kevin Mac
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Re: How much is too much (lower ball joint interferance)

I got it in, the reason I was concerned was the metal was starting to split where it is rolled out from the stamping. That made me want to research a little.
Thanks

Mac
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Old 11-13-2017, 04:31 AM   #7
mr48chev
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Re: How much is too much (lower ball joint interferance)

What A arms are you putting the ball joints in? When I was doing front end work I used to run into some GM lower A arms that were a bit sloppy and wouldn't hold a ball joint tight. I took a center punch and staked some and replaced others. Even tack welded a couple of ball joints in place when the owner didn't want to spend extra money on them.

That said, I wouldn't grind on them to get them to fit.
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Old 11-13-2017, 09:34 AM   #8
Kevin Mac
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Re: How much is too much (lower ball joint interferance)

1979 stock G Body A arms.
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Old 11-13-2017, 05:09 PM   #9
mr48chev
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Re: How much is too much (lower ball joint interferance)

Are you using a ball joint press or ?
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Old 11-13-2017, 09:25 PM   #10
1958Warrior
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Re: How much is too much (lower ball joint interferance)

I used the BFH and some anti-seize and a piece of pipe as a driver, didn't have any fancy tool at the time. However I did go buy a press off CL for $75. For next time.
You could always pick up a press off CL and just resale it when your done, they seem to sell quick.
They do sell oversized ball joints, for the sloppy A arms ,I've never ran into the need to use one yet
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Old 11-13-2017, 10:25 PM   #11
Kevin Mac
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Re: How much is too much (lower ball joint interferance)

Warrior and 48, I used the BFH method also. Took the other side apart tonight but didn't try to drive that one in yet. I might drop it off at my mechanic's shop tomorrow and see if he will press it in for me.

Mac
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