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The Cure for "One-Hung-Low"?

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Old Aug 6, 2017 | 08:00 PM
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Default The Cure for "One-Hung-Low"?

My '72, like so many others, sits noticeably low on the driver's side, as viewed from behind. I've read other posts about this topic, but saw no definitive solution to this silly problem.

Today I jacked the wheels off the ground using my new lift, and noticed that the driver's side also comes off the ground noticeably before the passenger side. This indicates to me that the suspension on that side is more compressed.

So, I started poking around, and noticed the attachment bolts on the rear suspension bar. (See the pic, below.) It seems logical, to me, that I should be able to snug up the passenger side attachment bolt a bit, compressing that side, to even things out. Before I did so, however, I thought I might inquire with the group wisdom.

So what say you? Yay or nay? Tighten, or not?

Thanks!
--
Jay


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Old Aug 6, 2017 | 08:35 PM
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NICE lift
I think I would take some basic measurements first before doing anything.
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Old Aug 6, 2017 | 09:37 PM
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Wouldn't the left front still be high? Also, I would think depending on how much you tighten down the bolt, compressing the spring, it would change the spring rate on that side only. Might make the rear handle strangely??
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Old Aug 6, 2017 | 10:47 PM
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Doing what you propose will have an effect opposite what you stated that you wish to achieve.
A longer bolt lowers the rear of the car.
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Old Aug 7, 2017 | 11:56 AM
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With the rear wheels in the air, and assuming the jack is in the centre of the car, the only suspension components affecting the car are the front ones. I'd be looking there for something wrong, a broken spring, bent shock, or a broken sway bar link.
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Old Aug 7, 2017 | 12:33 PM
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Lower the car to rest on all four tires. Measure the distance from ground thru center of wheels to the lip on the fender. I think a small block 72 should measure 27 1/2 to 27 3/4 inches. Wouldn't be surprised if one side of the front is off.
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Old Aug 7, 2017 | 05:34 PM
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It may just be me or the angle of your picture but I'd swear the right side spring bolt is longer than the left.
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Old Aug 7, 2017 | 10:51 PM
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Sure looks to be an aftermarket probably VB&P Spring. Very rarely are the two spring bolts get adjusted to the same length. That's where You start and then You start adjusting them until You have the ride height and the car level. Its not uncommon to end up with one bolt an inch longer than the other.
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Old Aug 8, 2017 | 09:42 PM
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Originally Posted by Gale Banks 80'
Sure looks to be an aftermarket probably VB&P Spring. Very rarely are the two spring bolts get adjusted to the same length. That's where You start and then You start adjusting them until You have the ride height and the car level. Its not uncommon to end up with one bolt an inch longer than the other.
Okay, so that's the bolts i'm talking about, right?
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Old Aug 8, 2017 | 09:48 PM
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That is not only an aftermarket spring but those are longer adjustable bolts with nyloc nuts instead of the original with cotter pins. Try adjusting equally each side until you get it level.

Last edited by CanadaGrant; Aug 8, 2017 at 10:01 PM.
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Old Aug 8, 2017 | 11:24 PM
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Originally Posted by CanadaGrant
That is not only an aftermarket spring but those are longer adjustable bolts with nyloc nuts instead of the original with cotter pins. Try adjusting equally each side until you get it level.
Will do. I will report back.
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Old Aug 8, 2017 | 11:56 PM
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Originally Posted by jjhoneck
Will do. I will report back.
If you have to go too far on the adjustment then look at the aftermarket spring for your problem. In the photo it looks like the right side of the spring has more downward curve towards the end than the drivers side. See if you can measure from each spring tip up to a common point on the under body or frame with the weight off the car.

Last edited by CanadaGrant; Aug 9, 2017 at 12:11 AM.
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Old Aug 9, 2017 | 09:17 AM
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Check your front springs. If they were replaced and not indexed correctly, that will give you an uneven stance both front and back. The spring end should be about 3/8" from the top inspection hole at top of the spring pocket in the frame. I used blue painters tape on the spring end so I could easily see it when indexing the spring. Good luck. Jerrhy
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Old Aug 9, 2017 | 01:22 PM
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Originally Posted by sstocker31
With the rear wheels in the air, and assuming the jack is in the centre of the car, the only suspension components affecting the car are the front ones. I'd be looking there for something wrong, a broken spring, bent shock, or a broken sway bar link.
Originally Posted by Tampa Jerry
Check your front springs. If they were replaced and not indexed correctly, that will give you an uneven stance both front and back. The spring end should be about 3/8" from the top inspection hole at top of the spring pocket in the frame. I used blue painters tape on the spring end so I could easily see it when indexing the spring. Good luck. Jerrhy

Agreed. You can't only level the rear, it will also affect the front. Same as the rear only can't be out unless the frame/body is twisted. The front might not look as bad, but it's likely out too.
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