I'm not sure if the boots are replaceable, Billy probably knows...
I have a plan to use a stretchy mecatec CV boot to slide over the drive shaft CV and keep it greased & dirt free. I had this idea about 6 months ago but haven't tried it yet.
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I have heard they are not rebuildable...don't know first hand though. Hopefully by the time I trash this one I will be ready for the solid axle.