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Re: Rear Shocks Bump
Posted by John Miller (more from John Miller) on Fri, 17 Nov 2000 16:39:28
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

> The main problem here  is that the OEM buys a specific shock for the cars
> he's making now, and keeps a quantity of the dozens or hundreds of
> different models used over the years in the spare parts pipeline.  (
<snip>
> Therefore, a Koni 9000 shock or a Bilstein 9000 strut, for example, may
> be the same part number for every 9000 made, while Saab may have used a
> dozen different specs over the years, depending on the precise weight and
> spring settings

True, to some extent.  However - an OEM may specify a particular setting 
for new production but that doesn't mean they're going to inventory and 
sell it as a service part.

OEMs have exactly the same pressures to reduce inventory carrying costs as 
aftermarket suppliers, and in the case of something like shocks they won't 
necessarily keep the part sitting on the shelf indefinitely (you wouldn't 
necessarily want a set of shocks that'd been sitting on the shelf for ten 
years anyway.)  They'll order batches from the manufacturer as their 
inventory runs down, and they may supercede earlier settings to later ones 
or otherwise cut down the number of different calibrations they stock to 
simplify ordering and inventory.  So not only may the settings change, as 
time passes they may not even be made by the same manufacturer.

Someone with access to parts data should be able to say how many different 
model/year combinations Saab sells, say, 9000 front struts for.  I'd guess 
four, and wouldn't be surprised if it were fewer.

Once upon a time, looking at my 900 shop manual, I was quite surprised by 
how *few* different spring rate/length combinations Saab used on different 
models.

John.
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