Not sure exactly what your question is, but I'm assuming your cv joints are getting worn quickly? This is because the AC lift extends the CV axle at non stock angles. This is OK when off-roading for short times, but everyday driving not so much. Your best solution is to get some manual locking hubs. This way you can "disconnect" the cv axles so they won't spin when in 2wd (yes, it uses a drive flange so they are always spinning, even in 2wd). Mile Marker makes a decent set for about $100 (good for daily driving and your light off-road) and WARN makes a beefy set for about $230 (very strong). This is assuming you don't have the auto 4wd (you have to 'shift' into 4wd). If you do, you need to be careful not to switch the 4wd on when your hubs are unlocked (never have it in auto).
You can find more info on this if you google NPORA. Lot's of info for R50 owners there (Nissan path has a lot of R51 owners).
Let me know if this helps!
1996 Nissan Pathfinder SE 4WD (off-road project)
2001 Kia Rio 1.5 (autocross project)
2006 Mazda Tribute S (wifes)
2004 Nissan Sentra 1.8s (traded)
1993 Mazda RX-7 R1 CYM (sold)
1990 Nissan 240SX CA18DET (sold)
1987 Toyota Supra N/A (parted)
1991 Ford Escort GT Turbo (sold)
1983 Mazda RX-7 GSL (sold)
1987 Nissan 200SX Turbo (sold)
1998 Mazda 626 (parted)
1988 Honda Accord F20A (parted)
1997 Chevy Camaro Convert (traded)
1991 Geo Tracker 1.6 (sold)
2002 Mazda B2200 (traded)
1988 Toyota Celica (parted)
1988 Ford Ranger (blew up!!)
I think I've owned a few cars...