again. if the boots are just seaping and slinging the grease, you could most likely get away with quickly repacking the joint and using new clamps.
but if the boot is broken, cracked, or dry rotted, or the joint ran dry, or was exposed, then to do things right you'd have to pull the axle, pull the joints, clean them, inspect, and if all is good, reassemble with new boots, grease, and clamps.
by the book, if the joint was exposed to the elements for 24hours then the joint should be replaced, but most of us will try to get away with just repacking, etc.
of course if they are already clicking, well....
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don't touch me . . .
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93vtec4ws