I'm guessung that you have 4.10 or lower gears? Well this really isn't too big a problem, you can install this locker your self. You'll need to pull out your carrier assembly-the thing the ring gear is bolted to. When you do this you need to mark your bearing caps and keep the left and right one seperated so that you install them exactly as you took them out. You'll also need to keep track of any shims that may have been between the bearings and the housing. When you pull your carrier you might have to pry it out(it helps if you have one person pry it out while another acts as catcher to keep it from popping out and onto the ground. Keep track of the shims that fall out when you do this and place them back exactly as they were when you put it all together again. Next you'll have to unbolt you ring gear and take it off to install your locker. put the ring gear back on and use lock tite if it doesn't have lock tabs on the ring gear bolts. Bolt everything back up and torque everything back to specs and you should be good to go. As long as you reinstall the shims and bearing caps back in their original place the gear set up won't be affected. One last thing on some Jeeps I've worked on I have had to remove the tie rod to allow the carrier to be taken out. Don't turn it or mess with it and reinstall exactly as it was and your alignment should be fine. Hope this helps.