Yes, you still have to remove the ring gear & carrier and set backlash. The difference in the 4 pinion is that you don't have to separate the ring gear to install the locker. You can get pretty close to keeping the same backlash by just marking the positions of your tabs & counting threads.

Sid


89 extra cab 4x4 3.0 5 spd, 216K
4.56, Supra LSD, Lock Rite