Driving around with a cracked boot for even a couple days can damage the boot. The grease spins out pretty quickly actually, and the CV joint won't work without that grease. Even if you put a new boot on, the damage has already been done. CV joints are fairly cheap now, except for the labor. If you want to tackle it yourself its not too bad if you know what you are doing.
Its ok to drive around with the clunking, but eventually you will notice the front end shaking at high speeds, and that shake eventually starts wearing out other parts, like the shafts and seals on the tranny, so I wouldn't wait forever if I were you. I can
t think of any way to check it, but as a rule of thumb, if it clunks, its bad.
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