YJ89jeepTX, if you remove the passenger side axle, a collar which connects passenger side axle and center axle will be left inside of axle tube. You have to put it back to the axle when you install the axle back. So, you have to remove the shift motor to do this. The posilok should be very simple for you if you can install the aussie. You may do search how that shift motor works in this forum. good luck.
Been a long time since I've done this install but pretty sure it needs to be pulled in order to slide the inner shaft over out of the way, then back into place. The carrier won't come out with the inner shaft still in it, and the inner can't (if I remember right) slide over far enough to leave the carrier as the ring\shift motor would block it's movement. Someone may correct me on this, I did this install years ago. It's not a big deal to remove, if you have the "cable" style shift it's the exact same as the stock one, but a cable instead of fragile vacuum lines.
My jeep has only ever killed 3 things, a cat, a deer, and my wallet. What's the problem officer?
1992 Red YJ. Lifted, locked, and loaded with beer (Disclaimer: This doesn't mean said driver endorses drinking and driving, please enjoy alcohol responsibly and do not operate any vehicle of any kind, thank you....)
Thanks to the price of gas here ($4.25 a gal) I just bought a mountain bike, 0" of lift, 0" of travel, MT's, locked rear axle, oh yeah, it's the sh#$.