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Unread 10-20-2012, 11:59 AM   #1
RedCJ83
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Axle Welding

So as I'm driving down a neighborhood street, yes, I'm embarrassed, snap the center diff spins about 1/2" on the tubes of my AMC 20. Through much effort we've managed to move it about 1/4", but now it really seems stuck. Nothing is leaking and the tubes seem straight. I've got too much invested in entirely brand new internals to walk away from this axle and Dana 44's don't grow on trees around here. So I've got to get this straightened out. Here's the latest idea; Tell me what I'm missing:

1) We will cut off the spring perches, move them 1/4", effectivley "rotating" the axle and remount them. The vent tube will not be pointing down or even straight out, we will weld the tubes, install a truss, and we will relocate the brake line mount to the truss.

2) Plan on doing all of this without disassembling the axle: we plan on welding about 2-3 inches on one side, then switch to the other to control tempature. Any concerns about ruining any of the internals because we are not breaking down the axle?

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Unread 10-21-2012, 08:06 AM   #2
nshefbuch
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Would it be easier to strip the internals then pull the entire axle out and heat the tubes to rotate them back if you have a reference point and then weld them? This is how I would do so since you need to strip most of the internals to weld the tubes anyways.

Whatever way you fix it please post up what you did. I'd love to see some pics of now and the fix.
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Unread 10-21-2012, 11:09 AM   #3
ratmonkey
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I'd want that thing put in an alignment jig at this point
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Unread 10-21-2012, 11:22 AM   #4
nshefbuch
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Quote:
Originally Posted by ratmonkey
I'd want that thing put in an alignment jig at this point
If all the tubes did is rotate a jig is overkill to me. Now if they split then yes I agree or completely new tubes need installed.
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Unread 10-21-2012, 11:38 AM   #5
ratmonkey
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in my limited experience i've seen them spin and slide out instead of just spinning.
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Unread 10-22-2012, 07:49 AM   #6
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Your not going to like this answer but I would get an other axle and start fresh. I had a 14 bolt spin years ago, wasn't worth the effort to repair it.

Once you move a tube from a factory press fit it will never be the same, the plug welds dont hold the tubes in place they are only ment to keep the tube from spinning.
So you cracked the plug welds and spun the tube, so now what happend is the factory bond ( the few thousands press fit ) is gone to some degree. Yes the tube is still in place but its not going to be 100% no matter what you do.

You can get it close but it will never be the same and judging from how much you built this axle I'm guessing you built it to rely on it. Can you safely say after the repair it will be what you expect.

Its a AMC 20, there are probally a few at a local junkyard. To me its worth finding another one plus the AMC 20's are prone to have weak center section, so whats next with the current axle.
Get a new one, clean it up, install old parts into new axle and weld the tubes.

This is why every build I see I tell peaple weld your axle tubes to the housing. It gives you that extra security out of an axle, some listen some dont.

Jason.
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Unread 11-09-2012, 06:51 PM   #7
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Get an angle finder and a bottle Jack. Jack up the pinion till it meets your angle required while its still in the jeep. Weld the axle tubes. Or get another amc 20.
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Unread 11-09-2012, 08:53 PM   #8
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I'd have it out and on a jig as well, if it was me. I say pull it and fix it correctly.
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Unread 11-10-2012, 12:19 PM   #9
jambojeep
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As long as there is no deflection in the tubes and its level you'll be fine. Make sure the tubes haven't shifted out of the housing too
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Unread 11-10-2012, 12:45 PM   #10
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Quote:
Originally Posted by jambojeep View Post
As long as there is no deflection in the tubes and its level you'll be fine. Make sure the tubes haven't shifted out of the housing too
When a tube spins it moves, it might have moved a 1/16" or maybe more, how can you say the tube hasn't moved it did in a twiting action.

OP its a AMC 20, find another one. Weld the tubes this time maybe even a small truss lock it in from with a fresh axle and prevent this, dont try and save junk.

Jason.
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Unread 11-11-2012, 05:31 PM   #11
jambojeep
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Spinning and sliding are different. It spun yes. It might have shifted out of the housing yes, but if it didn't just reset the housing and weld it. The deflection, talking axle tubes not being parralell, is dependent upon if the axle tubes shifted from the housing or if they are bent. Get a tape measure and level out and figure out what's the deal with the axle. Rotating the pinion with a bottle Jack and welding the tubes is a bit easier than putting a new One in.
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Unread 11-11-2012, 06:44 PM   #12
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Quote:
Originally Posted by jambojeep View Post
Spinning and sliding are different. It spun yes. It might have shifted out of the housing yes, but if it didn't just reset the housing and weld it. The deflection, talking axle tubes not being parralell, is dependent upon if the axle tubes shifted from the housing or if they are bent. Get a tape measure and level out and figure out what's the deal with the axle. Rotating the pinion with a bottle Jack and welding the tubes is a bit easier than putting a new One in.
I know trust me I spun a 14 bolt many years ago.





Again once the factory tube spins how can you trust it wont again. Yes the housing can get welded back to the tubes, but how can it be trusted.
Again welding the tubes to the center section is only used to prevent them from spinning not locking them in place.
Once a tube spins its lost its factory press fit, yes its still a press fit but what got lost when it spun free?

Thats why I said its a model 20 there a dime a dozen, pull all your parts swap it over to a fresh housing, weld the tubes, add a truss and call it good. The OP hasn't responded to his own thread so we dont know how he fixed it, something you want to trust and keep get another easy to find axle and start over.
Its not my axle or anyone else's so really I could care less how he/she fix's it, i'm just speaking on experence.

Jason.
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And on the 8th day, God created the 14 bolt....
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Unread 11-11-2012, 10:33 PM   #13
sjsst41
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I agree with Jason - it's an AMC 20 - should be able to find a donated housing, move over your parts, stitch weld the tubes to the diff center & call it good.
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Unread 01-26-2013, 07:39 PM   #14
lifeisgood916
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hey

Dang! That's a bummer, might i suggest a d44 though, do the work once,
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Unread 02-04-2013, 12:21 AM   #15
82JeepCJ7
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Mine did this awhile back....



The welds snapped on the spring perches. The axle was rotated back into place and the perches were re-welded.

I then built a traction bar to help keep it strait in the future.



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