All front axles as shipped by Jeep are open. A lunchbox locker like a Lockrite, Aussie, or No-Slip will be fine on snow-covered roads so long as you stay in 2wd. In 4x4, any front-mounted automatic locker will cause understeer so you have to be careful after shifting into 4Hi or 4Lo.
Took me 3 or 4 hours by myself. You have to pull the carrier out then take the ring gear off and then you can get the pin out and then all the spider gears. Make sure you keep track of where everything was. It has to go back exactly how it was.
I used a spartan in mine. Most of the lunchbox lockers are basically the same. Mine was about a 2 1/2 hour install in my driveway. Excellent step by step on YouTube and some forums. If you can do a brake job then the locker will be easy. No real issues with mine and I can't tell its there until I lift the fun stick off road.
Sometimes I have to back up to get it to unlock after I disengage, no biggie just be aware.
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