Are you talking about adding more grease into the CVs?
if so your only option is rebooting kit.
Comes with new boots, grease, and clamps.
More than likely after you lift your boots will rip, its up to you whether you want to reboot while you have everything apart and its easy access as you are installing your lift or wait till they rip and do it then.
So maybe a stupid question but is there a way to rehydrate a CV boot? I ask as I'm going to lift my rig in about a month and thought this would be enough time if I start now if it is even possible.
No, talking about the plastic boot that holds the grease in. When I install the lift will not have the time to re-boot my CVs. Will most likely buy the Napa CVs and re-boot my OEMs when I have the chance as a backup.