[jluetjen]

Hi Grady;
I think you are confirming what I suspected which is that the flanges for an LSD equiped 901 are different then for a 901 with a normal diff. In my case I'm using a normal diff, but I figured that I'd offer that up for some lateral thinking about the problem in case someone could take that idea and run with it.

As far as the surface hardness, my machiniest and I considered it and chose to not treat the parts given the fairly large bearing surfaces involved vs. the expense and difficulty. One machinest didn't want to do it since he throught that cutting through the surface treatment would be a pain. The second (a full-time machine shop that did many industrial jobs for my previous employer) didn't have any issues. Consider my road use an endurance test and I'll share what I see when I pull them out. So far there haven't been any issues and I've been using them for about 8-10K miles of weekend driving, but no DE's or track events.