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Spun Axle Tube

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Red20 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Topic: Spun Axle Tube
    Posted: Sep/24/2017 at 12:28am
I haven't had the chance to crawl under it yet, but I'm suspecting I may have spun a tube. I launched fairly hard from a stop sign on a road with no traffic where I often accelerate hard for fun and something didn't feel right. It didn't hook up and launch very hard. It was mushy, for lack of a better description. The the rest of the drive home felt a little like I had two low tires on the passenger side. It wasn't pulling hard, just felt off and the car didn't feel level. When I parked and looked at it, the rear end was a good 1-1/2" - 2" lower on the passenger side.

Any thoughts on possible causes. I was thinking either spun tube, broken leaf, damaged spring pocket/unibody, spring perch...? Is there a quick way to tell if a tube is spun?
1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gelalthedamned Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 4:17am
I broke a rear shock mount once
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 4:44am
I hope it's something simple like that! The shock mount is on the lower u bolt plate. Maybe the upper mount tore through? I should know later this afternoon after I get it up in the air and crawl around underneath. I need to reinforce and move my sway bar mounting pads on the unibody rail also. I installed it when I had the original springs in the car. With the HD springs and extra leaf, the ride height change causes the end links to not be straight up and down. I'm really liking the ride with the forward clamped HD AMX springs and extra leaf. Hope one's not broken.
1969 Javelin SST "Screamin' Banana" - Totaled Feb 2018
1973 Hornet Sportabout X "yellajack" - 360/727/TracLoc DAILY DRIVER
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 7:52am
For 69 take a close look at the upper shock mount area. Sorry to say but this is weaker then the lower mount if the car did not have the cross mount plate installed (which would be the easiest fix).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6768rogues Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2017 at 7:55am
Sounds to me like a spring problem, broken or twisted. With the U bolts torqued and spring plates welded to the tube, it is hard to twist a tube but it could happen. Twisting that tube would have had to hold the spring wound up to make the car lower on one side. If it slipped inside the U bolts, it would not be lower. Shocks do not support weight, but I guess a severely bent mounting point could hold the shock at its limit but it would have to be really bent. I hope it is not serious damage to a suspension mounting point. I would start with the springs, I have broken leaves several times and not always by doing hard launches, sometimes they just break. Look closely, could be a break buried in the spring pack.


Edited by 6768rogues - Sep/24/2017 at 8:00am
Why Ramblers? Chicks dig 'em. Whatever it is, I can take it apart.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Sep/25/2017 at 7:32am
Check to see if the hub moved on the axle -- unless you're using one piece aftermarket axles. Easy to see -- pull the center cap of the wheel then take the axle nut off. If the key is sheared or moved...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/25/2017 at 8:49am
Thanks gentlemen! I haven't had more than 2 minutes to look under the car this weekend. I was gone most of the week and the honey-do list was long this weekend plus 5 kids and sports. A quick look didn't reveal a broken leaf or spun tube. BUT I'm probably missing something. It'll have to wait until this weekend to put the car in the air and go through everything. If I had money, I'd just get all new springs front and rear and rebuild or replace the rear end altogether.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6768rogues Quote  Post ReplyReply Direct Link To This Post Posted: Sep/25/2017 at 2:35pm
The car sitting lower on one side is what lead me to believe that it is a spring problem. Even if it does not appear to be broken, take some measurements to be sure. Sometimes breaks can be hidden from sight.
Why Ramblers? Chicks dig 'em. Whatever it is, I can take it apart.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Red20 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/25/2017 at 5:06pm
Originally posted by 6768rogues 6768rogues wrote:

The car sitting lower on one side is what lead me to believe that it is a spring problem. Even if it does not appear to be broken, take some measurements to be sure. Sometimes breaks can be hidden from sight.


That's what I'm hoping it is. I'm wanting to either rebuild the Model 20 and go with solid axles and a Detroit OR swap in a 9" (possibly a built 8"). But I'm not ready financially to do that yet. Springs aren't cheap, but I know where I can get another used pack to custom build kind of like I did this set. But even if I get a new pair, it's cheaper than a new rear end.

Ideally, I'd just have the money and go ahead and build a new rear end, get some Calvert Racing split monos and CalTrac bars and get new, proper lower front coils. My cut front coils and Frankenstein rear leaf packs work and look great but aren't exactly long term solutions. I'm working my way through the 60s and 70s tech on my way to actually doing things right with modern aftermarket technology. Nostalgia by virtue of a limited budget and the desire to tinker and hack, I suppose.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Sep/25/2017 at 6:47pm
Trucks break springs all the time and they have curve and load charts that go way back for cars and trucks of almost any make and model. If you have one side broken you will have to do both anyhow. I had mine re-curved and an extra leaf added for $225. I know others will say go new but there has been decades of these people doing this work and a good shop will know what they are doing and you will likely get a better product at the end of the day.
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