Interesting. I think I'm going to go with 35" tires for now and slowly put together some axles before I upgrade to 37s.
Oh, and standard XJ/YJ/TJ WMS is 60. So hard to find an axle through web research that has discs, close to the correct WMS, and correct offset. I think I'll start rummaging through the junk yards and measure in person before grabbing some.