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Unread 05-24-2012, 07:27 AM   #1
Myren
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Spring hanger question

Hey guys,
So I've got a 79 CJ-7 that is mostly unmodified. I was trying to fix the death wobble by replacing all of the steering/suspension bushings and adding some shims and while jacking the Jeep I noticed that the front left spring hanger wasn't attached very well. There was an attempted weld on the top but it didn't penetrate cause some PO tried to weld to the chassis paint.

Is it true that the hangers were only riveted from the factory? Would it cause a strength problem if I used the rivet hole on the bottom and drilled the top of the frame rail so I could use some grade 8 bolts to secure the hangers? The frame does look to be solid with only a little surface rust.

Also I have no welder, never welded and finances are tight right now. Just want to make sure it's safe till I can do a full rebuild.

Thanks,
Myren

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Unread 05-24-2012, 07:37 AM   #2
RenoF250
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I believe mine are bolted not riveted. What does it look like now? Do you have any pics?
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Unread 05-24-2012, 10:39 AM   #3
80cj
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Quote:
Originally Posted by RenoF250 View Post
I believe mine are bolted not riveted. What does it look like now? Do you have any pics?
Yes, they are bolted on from the factory using two 7/16" bolts. The factory spring hangers (shackle brackets) have a hole in them to clear a frame rivet and that weakens them substantially. I discovered that one of mine was broken through one side of the clearance hole. I replaced both front brackets with heavy duty ones made by Tomken Machine. Theres a fellow on this forum that makes very nice ones milled from solid steel (chrome moly as I remember). I can't remember his name. Somebody will probably chime in with his name.
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Unread 05-24-2012, 10:41 AM   #4
Renegade82
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The rear front spring hangers might be riveted and welded but the front shackle hanger should have two bolts and a hole that fits over a rivet head, but it's not riveted on.
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Unread 05-24-2012, 10:49 AM   #5
Myren
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I'll get pics later as I'm at work. I'm talking about the spring hanger and not the shackle hanger, so it's the spring attachment point towards the center of the frame.
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Unread 05-24-2012, 10:51 AM   #6
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Yeah, the smaller shackle hanger brackets at the corners are bolted on to the frame while the larger main hangers near the center are riveted on with large rivets that Ive never seen come loose. Also the outer tab of these are welded. Anyone who has tried to remove a main hanger can tell you how "attached" these are and not gong anywhere. I ground down both rivets below the surface and used a sledge hammer and had a hell of a time getting one rivet out. A plasma cutter is the way to go.
If your Jeep is driving bad with death wobble, It should be other issues than the frame hangers. You front left one is sandwiched between the frame and your steering box brackets so if its loose, so is your steering. It should have 3 bolts holding those brackets to the frame with no access to the top you mentioned. A picture of the described area would be helpful.
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Unread 05-24-2012, 10:54 AM   #7
Hylke
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The front shackle hangers are bolted on originally using two 7/16-14 bolts (coarse anyway). The main eye IS riveted to the chassis.
Contact Jim1611 for his shackle hangers. He machines them and sells them as a set, front and rear. Both CJ and YJ.
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Unread 05-25-2012, 08:00 AM   #8
Myren
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Ok, got some pictures this morning....

In picture 1 the red is how much the hanger is moving and the green points to the dirt & oil that's been cleaned from the movement.

In picture 2 the green arrow shows the rivet and the red how much it's moved from the bottom of the hanger.

Picture 3 shows the rivet pushed back into place.

So if I removed the rivets & drilled to the top of the frame would that cause and weakness in the frame?

Thanks for all the replies so far.
Myren
hanger-1-arrow.jpg   hanger-2-arrow.jpg   hanger-3.jpg  

Last edited by Myren; 05-25-2012 at 09:44 AM..
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Unread 05-25-2012, 08:07 AM   #9
RenoF250
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Quote:
Originally Posted by Myren View Post
Ok, got some pictures this morning....

The red is how much the hanger is moving and the green points to the dirt & oil that's been cleaned from the movement.


The green arrow shows the rivet and the red how much it's moved from the bottom of the hanger.


This shows the rivet pushed back into place.

So if I removed the rivets & drilled to the top of the frame would that cause and weakness in the frame?

Thanks for all the replies so far.
Myren
For whatever reason your links are not showing up on the page but I can see them when I quote.

Anyhow, yeah that is no good. Bolts of the same diameter as the rivets should be fine if you could get a nut in there and hold it. I would also weld it again.
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Unread 05-25-2012, 08:08 AM   #10
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Myren,

You really need to talk to Jim Crabtree of Crabtree Tool & Die who makes the best, most stout shackle hanger and kits out there. He is Jim1611 here on the forum and his website is:http://www.crabtreetool.com/
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Unread 05-25-2012, 08:41 AM   #11
RenoF250
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Myren,

You really need to talk to Jim Crabtree of Crabtree Tool & Die who makes the best, most stout shackle hanger and kits out there. He is Jim1611 here on the forum and his website is:http://www.crabtreetool.com/
You guys are still on the wrong end. Look at the pictures. He is having problems with the fixed end.
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Unread 05-25-2012, 09:46 AM   #12
Myren
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Sorry, here's picture 3 rotated correctly & smaller....
hanger-3.jpg  
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Unread 05-25-2012, 09:58 AM   #13
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A through bolt won't really weaken the frame, but you'd be much better off finding someone to weld that fixed mount to the frame.

The problem with through bolts is the potential is there to deform the frame as you tighten the bolts. The proper way to through bolt is to add a tubular spacer between the top and bottom of the frame rail that the bolt passes through, which also requires welding.
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Unread 05-25-2012, 10:00 AM   #14
Hylke
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Well yes, that's the main eye, not the shackle. His story made me think of the shackle hanger though.
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Unread 05-25-2012, 12:07 PM   #15
Myren
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Yeah, I thought my terminology was throwing people off. I've only seen those called spring hangers and not main eye.
The over tightening makes sense and I never considered that..... Guess I gotta get a welder now

When I'm ready to tear down to the frame & rebuild I was gonna get Crabtree hangers anyway.

Thanks again for the help.
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