Your best bet is to go to any aftermarket auto parts store and pick up a
Haynes manual for your year/make/model of car. They're under $20 and
contain a wealth of DIY information. Well documented with photos as well.
I don't know if the '92 Lumina has a simple shock or a McPhearson strut in
the rear, but if it's not a strut, replacing the shocks is a walk in the
park. Simply unbolt the old and bolt in the new. One quick look underneath
it will make it obvious. If they are struts, you'll have to remove the
strut and take it somewhere that can compress the strut. My guess is that
they are not struts, but you can't count on that guess.
I was afraid that might be the case. I knew that the Buick Park Ave of that
year had struts, but I wasn't sure about other body styles. I'm guessing
they are like the Park Ave then, and are not replaceable cartridges, as
well - meaning a complete spring compression and strut replacement.
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