"acceptable" ball joint play - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 13 Old 08-12-2012, 06:55 PM Thread Starter
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"acceptable" ball joint play

Been trying to determine if my stock balls joints are in need of replacement or not..

I have used the method described in numerous threads of putting the front end on jack stands and using a pry bar under the tire to check for play. In my instance, there is some up and down play, if I was to guess, I would say maybe a millimeter, possible 2? But its very difficult to eyeball it. There is no side to side play at all...

What I am trying to determine is how to one would accurately measure the degree of up and down play I have. I believe the factory specs for acceptable ball joint play, is about 1.5 millimeters.

Any ideas?

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post #2 of 13 Old 08-12-2012, 07:34 PM
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The up and down limit is 1.25mm
The most accurate way to measure it is with a dial indicator.

You can get a pretty good idea by holding a mm scale next to the joint while someone moves the tire up and down.

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post #3 of 13 Old 08-13-2012, 05:14 PM
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I followed Planmans write up. If there is enough gap to where you can see light, then I believe they need to be replaced.
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post #4 of 13 Old 08-13-2012, 05:21 PM
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If they aren't Poly or Dynatrac, they should be replaced.

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post #5 of 13 Old 08-13-2012, 06:55 PM
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I didn't realize how expensive these things were....I am in need of ball joints pretty bad.

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post #6 of 13 Old 08-13-2012, 07:32 PM Thread Starter
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Quote:
Originally Posted by chainboy1 View Post
I didn't realize how expensive these things were....I am in need of ball joints pretty bad.
What type of symptoms do you have or are you basing this off of the degree of play?

2008 Black 2Dr 6spd D30/44
RK 2.5 X-Factor | Synergy tie rod | 35x12.5 MTRK's | BFH front | Genright rear | Yukon 5.13's | ARB front locker | Warn M8000 w/MasterPull synthetic | Rigid 10'' E-series
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post #7 of 13 Old 08-14-2012, 07:08 PM
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I can look under my Jeep and can see a pretty good gap between the castle nut and the spindle. I assume that if it has worn enough to see a gap as big as I have, you don't just tighten things up. I am thinking it's time to replace. Not like it would suprise me, I beat the hell out of my Jeep.

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post #8 of 13 Old 08-14-2012, 07:28 PM
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Quote:
Originally Posted by chainboy1 View Post
I can look under my Jeep and can see a pretty good gap between the castle nut and the spindle. I assume that if it has worn enough to see a gap as big as I have, you don't just tighten things up. I am thinking it's time to replace. Not like it would suprise me, I beat the hell out of my Jeep.
I don't know if your ball joints are worn or not, but a gap between the castle nut and the knuckle is a completely different problem.
At the very least, you should try to tighten that nut before you drive the Jeep again. While you are there, look it over to see if you can determine why it loosened up.

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post #9 of 13 Old 08-14-2012, 07:35 PM
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I will have to get in there and check it out. I didn't look at it to hard. I guess with as hard as I am on it just assumed they are done. =)

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post #10 of 13 Old 08-15-2012, 05:55 PM
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I am new here but have had jeeps and other 4 wheel drive vehicles, some highly modified. Anybody that buys those Dynatrac ball joints has more money than brains. Moog from Oratlies with lifetime warranty are plenty good enough !

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post #11 of 13 Old 08-15-2012, 06:05 PM
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Quote:
Originally Posted by 50cal View Post
I am new here but have had jeeps and other 4 wheel drive vehicles, some highly modified. Anybody that buys those Dynatrac ball joints has more money than brains. Moog from Oratlies with lifetime warranty are plenty good enough !
Thanks for your input. It's one of those jobs I only want to do once. So I will gladly pay the 250 to know I'll never have to do it again.

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post #12 of 13 Old 08-15-2012, 07:29 PM
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Quote:
Originally Posted by svtmaniac View Post
Thanks for your input. It's one of those jobs I only want to do once. So I will gladly pay the 250 to know I'll never have to do it again.
I have 80,000 plus on 2009 JK unlimited rubicon and the stock ball joints are just begining to show wear. I will replace them with MOOG joints for half the price of some inflated hyped product. If running oversize tires and wheels it is just given that ball joints will have to be replaced on a more regular schedule than normal.
What I am saying is dont drink the Kool-Aid for a Kool sticker.

It came to me that every time I lose a dog they take a piece of my heart with them. And every new dog who comes into my life, gifts me with a piece of their heart. If I live long enough, all the components of my heart will be dog, and I will become as generous and loving as they are.Ē ~Unknown
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post #13 of 13 Old 08-15-2012, 10:12 PM
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MOOGs at rockauto are $38 for the uppers and $48 for the lowers. So... ~$172 plus shipping for a full set.

Full set of Synergy BJs can be found for $244 shipped.

So, yeah... you're saving a little. Probably not saving at all if bought locally - but if you get a lifetime warranty - could be worth it to some people.

Now... compared to Dynatrac - yes, you're saving alot. are they still $600 / set?

Good to know MOOGs are available now. Took 'em long enough to come out. I might have went that route, but already bought Synergy.

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