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Old 06-17-2013, 08:52 AM   #1
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lower Ball joint castle nut size

Can someone tell me what size the lower (larger) castle nut is on a d30 ball joint. I've searched Google but the only thing I can find is Stu off-road and he says he "thinks" it's 1-5/16. I need to know for sure because I need to go buy the correct size. The upper is a 7/8 I need to know what the lower is, thanks!

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Old 06-17-2013, 09:14 AM   #2
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Can someone tell me what size the lower (larger) castle nut is on a d30 ball joint. I've searched Google but the only thing I can find is Stu off-road and he says he "thinks" it's 1-5/16. I need to know for sure because I need to go buy the correct size. The upper is a 7/8 I need to know what the lower is, thanks!
Buy the correct size what? I've removed hundreds of the lowers and never used anything but a large Crescent Adjustable Wrench and a pair of side cutters to pull the cotter pins.

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Old 06-17-2013, 09:18 AM   #3
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Yea I was just going to buy a socket that fit it. I have two jeeps to do ball joints on. I guess I could use a crescent though.
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Old 06-17-2013, 09:23 AM   #4
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Yea I was just going to buy a socket that fit it. I have two jeeps to do ball joints on. I guess I could use a crescent though.
If you don't have one already, throw that money towards a real balljoint press from OTC, Specialty, or similar. It's worth it.
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Old 06-17-2013, 09:25 AM   #5
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Tops 7/8 bottoms 1 1/8 buy a good 6 point socket or wrench.
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Old 06-17-2013, 09:34 AM   #6
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Thanks Guys.
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Old 06-17-2013, 09:57 AM   #7
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One other question. I ordered these ball joints (Spicer 706944x) and I'm curious what the brass piece is for, any idea?

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Old 06-17-2013, 10:43 AM   #8
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One other question. I ordered these ball joints (Spicer 706944x) and I'm curious what the brass piece is for, any idea?

The "brass" piece is a gold zinc plated steel insert for the lower balljoint hole on the pre 90 knuckles that don't have the upper balljoint with the pin that floats up and down.

In the "olden" days you would install the knuckle and then use that adjuster to compensate for the minor variations inherent to opposing tapered holes. Nowadays, we do it by letting the upper pin float up and down.
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Old 06-17-2013, 10:52 AM   #9
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Thanks! So that means I don't need to use the insert then correct? Just an extra piece encase I am installing them on a PRE 90.
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Old 06-17-2013, 11:16 AM   #10
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Thanks! So that means I don't need to use the insert then correct? Just an extra piece encase I am installing them on a PRE 90.
If you can find a place it works, use it, if not, toss it and the big snap ring.
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Old 06-17-2013, 12:58 PM   #11
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Well I'm putting the ball joints in a 2006 wrangler and a 2001 Cherokee so if your saying it's for PRE 90 then I don't see it having a place it would work, thanks!
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Old 06-17-2013, 10:24 PM   #12
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I was browsing through the RockAuto site at parts for my steering, and noticed they have adjustable ball joints. I've never seen these before so was curious. Do people use them a lot on the Jeeps or is it gimmick/not needed?
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Old 06-17-2013, 11:45 PM   #13
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I was browsing through the RockAuto site at parts for my steering, and noticed they have adjustable ball joints. I've never seen these before so was curious. Do people use them a lot on the Jeeps or is it gimmick/not needed?
The adjustables started when Jeep had an issue with a bunch of axles IIRC in 2000 or 2001 having a cross caster issue which caused a pulling to one side problem.

Someone developed an adjustable upper to fix the problem and they had them available on a TSB that included the uppers and the installation cups for a balljoint press.

A few years later the aftermarket came out with them and I notice they now have the lowers.

They can be used to solve a caster or camber issue up to about 2 in 1/2 increments. We used them in the South America XJ bolt in HP Dana 44 fronts to fix one side that was out about 2. That was before the adjustable lower which caused the axle shaft to be closer to one side of the tube. With the lower, you would use 1 with each to re-center the shaft in the tube if you needed 2 total caster change.

So no, not a gimmick, but a problem solver when needed.

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