I agree with Bounty Hunter, the aussie locker slides in the carrier in place of the spyder gears. the carrier does not have to be removed. I just put one in my jeep cause my kid distroyed the spyder gears. He SAYS he was just driving up a little hill and snap it was like it went out of gear. Of course I totally believe that bull storey as much as any parent believes a teen driver. but in anycase the aussie locker, shipping, gear oil, new brakes, about 2 hours and total cost of everything about $325 its back on the road. I went with the Aussie locker due to price and ease of install. right now is not the time for me to spend 800 to 1000 bucks an axle to have ARB, OX locker, or other wise. Fast easy and in my price range for the time, now I'm considering puttin one in the front I'm runnin 32 in mtrs and thinkin maybe the Posi lock cable. I like that due to the fact you can go 2 wheel low if you want. I did that to my last jeep cause the vacuum lines did crack and fail, it worked well but I think its a little over priced for what it is. anyway thats my take on lunch box lockers . Easy ,cheap , and they do work. not as fancy as a button on the dash