Do the shock test, rock the vehicle back and forth, as much as physical can, then release it, you should see one overshoot at most and then the suspension levels. More than one overshoot the shock fails.
BTW, passing this test means the shock/strut is NOT dangerous, it does NOT mean the shock/strut is good, and many worn out shock/strut can pass this test, but worn enough that replacing the shock/strut would produce a signficantly better ride and handling.
There is an argument that you need to balance left/right of the suspension, if you replace something on one side, you have to replace it on the other. Unless you are confident that the good strut is still darn close to like new performance, I'd replace both. If you have a 2" lift, that is going to exaggerate any bad handling, I'd think it would be even more important to balance left/right handling when replacing components that effect it.
Its a tough call, I'm sure people have replaced a single shock and couldn't tell any difference. Shocks can effect brake distance as well, so you want to be a little more cautious with a bad shock, and if you elect to go with replacing only one shock, at least approach any handling more cautiously until you've checked it out bit by bit.
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Last edited by Mongo; 01-25-2011 at 07:06 AM.