I have slightly higher than a 3" lift in the front. The inner boot for my passenger CV has ripped and grease is flung everywhere around it. The boot is old and seems weathered ...and I used the stretch technique to separate the ribs from rubbing after my lift.
I like driving off-road as much as possible, but that is usually not more than once or twice a month. There are some options I have...
1. Kit from Napa to re-boot the CV joints.
2. Aftermarket boots that are supposed to be tougher, maybe longer too?
3. Porsche longer boots. I think they are for the 930(?), but I'll need to do more research.
Despite my best efforts, I have a close to 3" lift as well. I will say this after 4 years of having my lift...everything rubber related to your front suspension will wear out much faster. That's why I wanted to lower it a smidge, and I was hoping I'd drop more than .25" when I replaced my Tundra Bilstein 5100s for Tacoma ones, but it really had more to do with my Eibach spring. I digress...
1.) Rebuilding CV joints is a pretty massive pain in the ass. I did it once after my original lift using CVJ silicone inner boots and their neoprene outers. I think it was like $30-50 more if you include the core deposit to just get reman'd ones from them with the same boot setup.
I'll say that I never had any issues with those CVs function-wise, but the silicone boots busted after four years (?). They now include a rubber o-ring to put around the inner-most rib because I guess they can tear easily if stuff gets in there and rubs around.
I ended up buying reman'd CVs from CVJ this last summer, but I've experienced some issues in the front end that I didn't have prior to having those. I'm slowly eliminating other possibilities just in case, so I don't want to say it's for sure those, but my point is that I never had issues with my OEM CVs that I rebuilt.
2.) See above re: CVJ silicone boots. I'm probably going to go with something else next time around, as I don't have much faith in these holding up too well.
3.) Longer boots aren't a bad idea.
Good luck! Let us know how it works out!