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suspension question (c900)
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CarGuru > Saab > suspension question (c900) 10 May 2005 02:24:46
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suspension question (c900)

John B 9 May 2005 06:25:33
 Hi,

I'm concerned that the suspension on my 1992 900 might be on the way out. First
of all, the rear of the car simply looks lower than the front. That's not
normal, is it? Unless all those corpses in my trunk are weighing it down :)­

The other thing is that when I have passengers in the rear seat, the rear
suspension seems to bottom out regularly.

So, I'm wondering what I should be doing. Should I replace the rear only or
also the front? And what parts exactly need replacing? What special tools would
I need?

On a related note, I noticed that the front tire on the left side seems to be
wearing on the outside edge, whereas the right front tire isn't as much. Could
this maybe be a ball joint issue?

I don't know a whole lot about the suspension, and would appreciate any
enlightenment.

Thanks,

John
Add comment
Craig's Saab C900 Site 9 May 2005 12:17:45 [ permanent link ]
 John B <rotten_NOSPAM_@cci­l.org> writes:
I'm concerned that the suspension on my 1992 900 might be on the way out. First>of all, the rear of the car simply looks lower than the front. That's not>normal, is it? Unless all those corpses in my trunk are weighing it down :)­
The other thing is that when I have passengers in the rear seat, the rear>suspension seems to bottom out regularly.

I've noticed this a bit with my car (1983 900S), but I do know that the
bushes for the compensating links at the back are shot and will need
replacing soon. However that shouldn't cause too much of a problem with
normal driving. It probably depends what 'normal' means. 8-)
So, I'm wondering what I should be doing. Should I replace the rear only or>also the front? And what parts exactly need replacing? What special tools would>I need?

Something I'll be doing later this year is replacing all suspension bushes
with poly ones. Superflex makes bushes for C900's so you could look at using
them in your car too if you're going to do a full suspension upgrade at
some stage. In my case I was looking at replacing the shocks and the springs
too, but that's a very expensive proposition to go 'whole hog' with
heavy-duty Bilstein's and one of the many springs kits that exist. We have a
really good spring manufacturer here in Australia (Lovell's) that lists C900
springs in their catalog.
On a related note, I noticed that the front tire on the left side seems to be>wearing on the outside edge, whereas the right front tire isn't as much. Could>this maybe be a ball joint issue?

Have you checked the balljoint boots lately? Like CV joints, the boots
protect the workings and once they get compromised the workings fail
quickly. I know about that from the CV joint problem I had with my car a few
months back. 8-)
I don't know a whole lot about the suspension, and would appreciate any>enlightenment.

Neither do I, but there are some very good websites that cover general
suspension issues and some saab-specific ones as well.

Regards,

Craig.
--
Craig's Saab C900 Page --> http://lios.apana.o­rg.au/~c900 Sydney, NSW Australia
Craig's Saab C900 Workshop -- For all Saab C900 Enthusiasts world-wide!
http://www.saab900c­lassic.net http://www.saab900.­org c900@lios.apana.org­.au
Come and explore our site, and check out our web-forums, mailing list, etc.
Add comment
Charles C. 9 May 2005 23:23:56 [ permanent link ]
 John B wrote:> Hi,>
I'm concerned that the suspension on my 1992 900 might be on the way out. First> of all, the rear of the car simply looks lower than the front. That's not> normal, is it? Unless all those corpses in my trunk are weighing it down :)­

A common look of many classic 900s. The rear springs are likely to need
replacing.
The other thing is that when I have passengers in the rear seat, the rear> suspension seems to bottom out regularly.

Consistent with the springs gone.
So, I'm wondering what I should be doing. Should I replace the rear only or> also the front? And what parts exactly need replacing? What special tools would> I need?

From the sound of things I would say you cannot handle it yourself. Sorry.

[NB. The most knowledgeable on the recent c900s correct me].

It is an easy job to do if you have been doing other work on cars. When
I did this on a 1983 900 I needed two of everything. 2 hydraulic jacks
and two pairs of spring clamps/compressors.­ You also need stands which
you could use to support the car with (not the axle).

From memory you have to remove the bottom bolt of the shock absorber
and then remove the bolt of the trailing arm.

On a related note, I noticed that the front tire on the left side seems to be> wearing on the outside edge, whereas the right front tire isn't as much. Could> this maybe be a ball joint issue?

Are you in a left hand or right hand drive country? The left tyre is
more likely to do what you say on a left hand drive country.

How many miles has the car done?

Yes it can be a ball joint ... it can also be:
- a steering knuckle joint (the ball joint at the end of the steering rod);
- simply incorrect toe alignment (could happen with use and occasional
meets with curbs etc);
- other much more expensive things.

Basically the wheel is having to turn slightly to the right in order to
keep the car going in a straight line. On a left hand drive country the
camber of the road + wear and tear on the ball joints (all 3 of them on
each side) is enough to produce the results you see.

I would look for a bad ball joint and replace. It can be on either side
of the car. It can be more than one joint.
I don't know a whole lot about the suspension, and would appreciate any> enlightenment.

Hope it helps a little.

Regards
Charles

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Add comment
John B 10 May 2005 00:23:22 [ permanent link ]
 On Mon, 09 May 2005 20:23:56 +0100, Charles C. wrote:>
A common look of many classic 900s. The rear springs are likely to need > replacing.>

Ok, good to know.
From the sound of things I would say you cannot handle it yourself. Sorry.>

Oh, I've done lots of car repair projects that I can't handle myself. It
usually makes for an interesting mix of frustration, excitement, and rapid
learning :)­
Are you in a left hand or right hand drive country? The left tyre is > more likely to do what you say on a left hand drive country.

Ah, Ok. I am in the US. And these are old tires which will need replacing soon
anyway.
How many miles has the car done?

Roughly 126k miles.

Thanks for all the input. I think I might have a go at replacing the rear
springs and shocks, and decide what to do about the front end after that.

John
Add comment
Charles C. 10 May 2005 02:24:46 [ permanent link ]
 John B wrote:> On Mon, 09 May 2005 20:23:56 +0100, Charles C. wrote:>
A common look of many classic 900s. The rear springs are likely to need >>replacing.>>
Ok, good to know.

There might be two kinds of springs. Ordinary and heavy duty. I chose
the latter, the car stood higher than normal but gave a lot firmer ride.
It was good fun to drive but not "normal" looking.
From the sound of things I would say you cannot handle it yourself. Sorry.>>
Oh, I've done lots of car repair projects that I can't handle myself. It> usually makes for an interesting mix of frustration, excitement, and rapid> learning :)­

Then it is easy then ... but that is not the impression you gave.
Unless you have a real large spring compressor you will need two pairs.
Clamp the spring before you release the suspension but once you have
it out you will not be able to release enough the clamps to take them
off the spring. This is where the 2nd pair will be needed. ANd the
reverse for compressing enough the new spring.

You need two jacks ... one to control the axle and the other for the
trailing arm. Necessary for refitting as it is not easy to get the
trailing arm back in position.>
Are you in a left hand or right hand drive country? The left tyre is >>more likely to do what you say on a left hand drive country.>
Ah, Ok. I am in the US. And these are old tires which will need replacing soon> anyway.>
How many miles has the car done?>
Roughly 126k miles.

I think you have to look at the front too. If you are in the US and the
front left is wearing then there should be something a little bit faulty ;-)­
Thanks for all the input. I think I might have a go at replacing the rear> springs and shocks, and decide what to do about the front end after that.>
John


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CarGuru > Saab > suspension question (c900) 10 May 2005 02:24:46
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