I was gonna post again this morning, but I couldn't get on the site. After thinking about it, you don't have to grind the pin on the front axle (like Jefe said...sorry I thought it was you that had that problem. Don't remember who it was tho...) because you absolutely have to remove the ring gear to install it.
For those wondering if the Lock Rite is causing a problem in the front...It won't if installed properly. I installed one in the front of Karol's truck, and it works flawlessly. They are different than the No-Slip as you re-use the two side gears instead of replacing them. The two units function essentially the same way, but the No-Slip is just smoother (I've installed at least 3 of each type). There are definitely more tolerance issues that you have to be aware of with the Lock-Right than there are with the No-Slip, but when installed properly, they work fine. One of the things that must be checked is the condition of the existing side gears. If they are excessively worn, then they must be replaced for it to work right. You also have to make sure you use the right shims so that the gap between the Lock-Right gears is correct. They provide a square pin for this purpose (Same with the No-Slip).
I have a Lock Right in the back of my Sammy, Karol has one in the front of her X, and Doug has one in the back of his X. I installed all 3 (Doug and I did the install on his), and all 3 went in fine and work well. Personally, I have absolutely no problems with recommending it for front axle use as long as you have some sort of disconnect (Hubs, axle vacuum disco, brown wire mod). I ran Karol's truck with the front axle locked, but the xfer case in 2WD to see what would happen, and it drove normally.