Ditto on the " be careful on who you let install ARB" . I had 4 Wheel Parts do mine, and they didn't do a good job. These guys supposedly do dozens a year. Problem was, they never did a front locker on an IFS rig. 6 months later, I had ball bearings that were shot in the front pinion. My local mechanic found that the diffy fluid was about 1 qt. low when he checked out the noise problem. There is no doubt in my mind they didn't put enough diffy fluid back in when completing the install. Now, trying to prove it is another thing. I wish I had take more time or even spend more $$ on the front end to have someone do it right.