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Unread 09-06-2011, 07:38 AM   #1
Erik T.
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How to check if an axle housing is bent?

I found a HP D30 axle housing from a 92 XJ, with 3.73 gears, and good ball joints... for $50.

No shafts/unit bearings/brakes. (I'll be swapping mine over anyways)

But the seller says it may be bent.

Around here I can pick n' pull HP D30's for $100 all day long. There's 5 at the local yard right now. But I've yet to find anything other than 3.55. (So this 3.73 will save me from buying a new carrier for the regear).

How do I check it? Preferably with an easy method, that I can check when we meet instead of taking it to a mechanic/machinist to check.

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Hack work? :rofl: You just described half the modified jeeps on this board.
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Unread 09-06-2011, 07:45 AM   #2
DivineKaos
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I believe the proper method is on v-blocks.
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Unread 09-06-2011, 07:45 AM   #3
Erik T.
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V-Blocks? Can ya explain that a bit more?
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Hack work? :rofl: You just described half the modified jeeps on this board.
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Unread 09-06-2011, 04:25 PM   #4
Erik T.
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No other options besides the mysterious V Blocks?
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Hack work? :rofl: You just described half the modified jeeps on this board.
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Unread 09-06-2011, 04:33 PM   #5
jpross
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I too would like to know. Ive heard you can take the carrier out and run a string all the way through. Make sure the string is centered at each end and when you look inside the pumkin the string should be centered going into each axle tube as well if it is straight.
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Unread 09-06-2011, 04:36 PM   #6
little_Jeep
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Use a straight edge, compare one side to the other. Also, look very closely at axle tube where they connect to pumpkin.... look at the joint for signs of new metal being exposed. You will need to look close. If seller says "maybe bent", I would assume they are bent until proven other wise.
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Unread 09-06-2011, 05:16 PM   #7
99_TJ_Wyoming
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"maybe bent" usualy means - 'Its bent, but you might not notice right away, it only chews up bearings every few months'
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Unread 09-06-2011, 05:51 PM   #8
Erik T.
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That's sort of what I'm thinking. I had thought there was a method involving shining light on one end and looking down the tube.
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Hack work? :rofl: You just described half the modified jeeps on this board.
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Unread 09-06-2011, 06:04 PM   #9
wushaw
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A straight edge works.
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Unread 09-06-2011, 07:02 PM   #10
dmgiff
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Sitting here thinking about how you would do this.... I don't know how a straightedge would work... unless you remove the diff cover and carrier then have someone hold a long straightedge against the pumpkin on the machined surface. You could then check the straightedge against the height of the axle tube at several locations with another straightedge? You would have to rotate the axle housing and check all four sides maybe. And I don't know how you would check the other sides since you wouldn't be able to hold the straightedge against anything flat.

I'm sure someone else will come up with the method and I will look like an idiot for not figuring it out. I only went to high school, what can I say?

The string method sounds promising though I don't know how you would set it up. Maybe a couple jackstands at the perfect height on either side of the axle, then tie the string to the jack stands?

A modified V-block method would be to set the axle housing on two jack stands which would take the place of the v-blocks. Then take several measurements hopefully from a nice flat garage floor, to the axle tube in several locations. Rotate the axle housing so you get all four sides. Good luck.
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Unread 09-06-2011, 07:15 PM   #11
TJRUSSELL
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four metal pucks and a steel rod. Two of the pucks to fit in place of the carrier bearings. The other two fit into the recess on the flanges where the bearings would mount. Next, the rod would be passed through all the pucks which would align the flanges perfectly
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Unread 09-06-2011, 07:20 PM   #12
dmgiff
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^^ OK, that's a good idea. Probably cost more to manufacture the pucks than one of the unbent $100 HP30's though....
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Unread 09-06-2011, 07:21 PM   #13
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http://www.jeepforum.com/forum/f9/hp...43/index7.html
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