Alignment Needed After Rear Ball Joint Replacement?

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In the rear, If you replace the lower control arm ('coffin arm') or the rear control arm, you should get an alignment. Forward OEM type track arm (non adjustable) or drop link replacement do not require an alignment.

In the front, Lower control arm, inner or outer tie rod replacement equals alignment. Forward control arm (from lower control arm to chassis) and drop link replacement equals no alignment.