It has been a couple days since the Super 8.8 kit was install on my Grand Cherokee and I got to say I’m loving it. The vibrations have stopped, the axle width is the same as stock now, the rear end seems more responsive at speed, and the quality / strenght is over-the-top. The installation was smooth except for having a lug-nut that refused to come off resulting in me destroying one of my TJ Rubicon Moab Rims.
I’m not about to do my own write of a “how to” on this kit since the ones from the manufacture is just fine, here’s a link to it http://www.superioraxlegear.com/pdfdocs/installguide.pdf and here is back up of it.
Some tips I would add since your cutting the axle up and not everyone has a bearing-puller I just used the bar on my Hi-Jack to get it out. Also I feel like this is more of a 3-4 hour Job assuming you don’t run into any problems like I did.