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Old 09-21-2010, 02:14 PM   #1 (permalink)
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Question Passenger side rear sagging, how to fix it?

The passenger side rear sits about 1/2" lower than the driver side. 1/2" seems like a small amount, but looking at the car fromt the rear you can easily notice it. This is my first classic car and I'm learning how to fix things as I go, but I usually like to ask for direction before I start digging into new territory. So, what problems/symptoms should I look for? Any and all help is welcomed and greatly appreciated! - Shawn
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Old 09-21-2010, 02:28 PM   #2 (permalink)
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Could be a badly worn/rusted leaf spring, rusted out spring perch, or something wrong in the rear torque box area where the front of the leaf is bolted.

OR it might just be that someone tightened the driver side leaf shackle and mounting bolts while the car lifted on the driver side causing it to sit higher on that side.
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Old 09-21-2010, 03:03 PM   #3 (permalink)
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yeah +1 with aol could be a number of things from a simple mis matched tires and rims, to a bad shock or soemthing bent from age or a previous accident, incorrect amount of shims/leafs etc
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Old 09-21-2010, 03:46 PM   #4 (permalink)
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Okay, so I'll start by inspecting the leaf springs for rusted out joints or damage. Hard to test if it's a worn leaf spring ain't it?

I'll do the old press down on the back end and see if she bounces shock test tonight and count the leafs. Pretty sure they're the original leafsprings.

What am I looking for with the shims? should there be an equal number of the same height shims on both sides?

Tires and rims check out. The original wheels are still on the car with the same size tires all way round.

If there's no damage, rusted out joints, or bad shocks I'll look for a tutorial about installing leafsprings so I can adjust them properly.

Any other ideas?

If none of the above work out should I look at having the leaf springs re-adjusted?
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Old 09-21-2010, 04:52 PM   #5 (permalink)
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Visually check the angle of the rear shackles or if you have a level with a magnet put it on the shackles. See if the right side shackle is angled more towards the rear of the car than the drivers side. This will be an indication of a worn/sagging spring as the shackles should be almost vertical.
Just purchased new rears to correct problem.
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Old 09-22-2010, 12:22 AM   #6 (permalink)
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It could be your shocks, get a good set of KYB GR2 $20 each at rockauto
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Old 09-22-2010, 08:52 AM   #7 (permalink)
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Quote:
Originally Posted by Aussie View Post
It could be your shocks, get a good set of KYB GR2 $20 each at rockauto
Yep, that crossed my mind. I just had to replace the fronts because the bushing dry rotted and fell off. Good indicator to replace them. Maybe the back ones are wore out too. Thanks for all the input. I'm going to print this thread out and get started. Thanks!
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Old 09-22-2010, 09:29 AM   #8 (permalink)
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People get all concerned about this but my experience has show that spring rates are a crapshoot. You could buy two "identical" sets of springs and I'll bet they don't ride at the same height. Same for coil springs. IMO the only way to get a car level is to install all the springs, drive it for a while and then cut a front coil or use a lowering block on one side in the rear.
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Old 09-22-2010, 10:33 AM   #9 (permalink)
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Just a wild guess. A previous owner may have replaced the driver side rear (leaf) spring because only that side had broken leafs. Now possibly the passenger side rear spring has one or more broken leaf or possibly just sagging.
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Old 09-22-2010, 10:38 AM   #10 (permalink)
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The passenger side spring is probably shot. The way most rear ends work is power mainly come through the right side passenger wheel. over 40+ years thats the spring that will sag more because it takes more of the stress of acceleration.

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Old 09-22-2010, 02:00 PM   #11 (permalink)
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Like said it could be a bunch of reasons but Don't forget about looking at the front of the car. --Have you looked at the front also to see if it sits level?? Maybe your front coil spring is for some reason stronger on the left side of the car than the right side. Or the front right coil spring is weak. If so this will make your right rear (quarter) side sit lower. Have you looked at the front to see if it sits level. Drive the car around the block to let everything settle in then park it on LEVEL asphalt or a LEVEL cement drive. Pick the same measuring point on both sides, front and rear and see what you come up with. I usually measure in the center of each wheel where it starts to roll under to the ground to get an idea of how the car is really sitting. But remember the car has to be on a level surface. Jim

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Old 09-22-2010, 06:53 PM   #12 (permalink)
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Quote:
Originally Posted by Aussie View Post
It could be your shocks, get a good set of KYB GR2 $20 each at rockauto

I could be wrong, but my understanding is that shocks have nothing to do with your ride height. They are there to dampen the spring oscillation. Your springs are what is setting your height.
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Old 09-23-2010, 07:59 AM   #13 (permalink)
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Quote:
Originally Posted by 09Frank65 View Post
I could be wrong, but my understanding is that shocks have nothing to do with your ride height. They are there to dampen the spring oscillation. Your springs are what is setting your height.
100% Correct Frank.
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Old 09-23-2010, 04:36 PM   #14 (permalink)
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Both leafs look original. The rebuild is only 4 years old, and I'm pretty sure they weren't replaced.

I haven't checked the front ride height yet. They are the original springs. I've got a set of aftermarket springs to lower the front 1" to get rid of the rear sag look, but I haven't installed them yet. The new springs may fix the problem.

Shims sound like they would be a lot easier than replacing the leafs(?).

I've heard worn out shocks can be the cause of sagging, but I don't understand how. Can't hurt to check them though.

Thanks to all for your replies. You've been a great help!
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