Be careful when you put the pinion shaft back in. If one of the saddle springs is sticking out to far and you force the shaft in, you will screw up the spring. That happened on mine and I ended up having to get a new spring kit sent. About 75% in is about where the shaft will come into contact with the springs.
Also, my carrier needed to have shims put back in to tighten it up a bit. My 4.10 also came with a limited slip. After about 1000 miles of use, my No-Slip got so loose that it was banging and grabbing when it shouldn't have been. Just coasting to a stop and applying my brakes was enough to get it to lock up which would then activate my ABS. I opened it up and used the Powertrax measuring block (gauge) to see if the gaps were correct. The block would easily fit in either orientation which meant there was too much space. When I called Powertrax they said that it was imperitive that I close the gap to the correct tollerences or it wouldn't work properly. Since Desert Rat put it in, I had them put the shims in to close the gap. Unfortunately, I had sold all of my parts that came out and undoubtably could have reused some of the shims. They had a hard time trying to come up with them and get me out the same day. Since it was there error (among other errors that they made), I didn't mind making them jump through hoops to get it working correctly.
My No-Slip still bangs more than it did during the first 1000 miles and still locks up once in a while without power being applied, but at least it is manageable enough now that my Wife will drive it. I have no doubts though that when the time comes to sell my Explorer, the locker will have to be removed or it will scare away any potential buyers with the noises and clunks that it causes.
