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Put the car up in the air, rear wheels off the ground.
Push and pull the wheel at 12 & 6, then 3 & 9 and look at the lower bushing in the
knuckle, not the LCA. There should be no movement. Also, look for movement
at the top knuckle bushing for the UCA, & inner bushing on the upper LCA. These are
spherical bushings. When they go bad, they are not replaceable, per-say. If you
can find rubber or POLY bushings that fit in those positions, you can use them. The
spherical bushings simply make for better wheel track in turns and uneven road surfaces
to maintain camber angles under those conditions. Using rubber or POLY there will just
allow some camber changes as the wheel articulates.
You cannot buy the spherical bushings for the 5th gen, just the 6th gen, and they're
$600 even if they would work, and that is just for the knuckle. There is a POLY
replacement bushing for the inner UCA location. Finding ones that fit the knuckle
is the issue.
THEN, check your rear sway-bar links and bushings, they are the most common
reason for knocking noises.
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