I run 37" tires on 30-spline Longfield inners/outers on my FJ40...I have yet to break them....but have broken a 4340 inner before with the 37's...I also run 39.5's on occasion, and have busted some other stuff. (hell, if it's breakable, I've done it...and have been the first on a handful of things...)
The link suspension has zero to do with breakage, and the added balance is likely to reduce breakage given the same trail selection....however, that same added balance will push you to harder trails and more breakage...nasty cycle.
I researched for over a year before tackling my rear 4-link 1/4 elliptical setup, and am overall very pleased with it's performance. Medusa has likewise done piles of research, and has a great setup.
If this is a new idea, sit on it for a while....I did my setup "quickly" and it was 3-4 months of long nights.
There is no such thing as one answer to any question you have, so expect to wade thru 100 opinions to form your own solution...driving style, vehicle weight, trail choice, tire selection, and 100's of other things all come into play and what worked great on my rig may fail miserably on yours.
My next rig will be running SAW Airshocks, linked front and rear, with a pile of other changes...
Also, I ditched my SM465 in favor of a 700R auto a couple years back....won't bother with a manuall again....
and finally, the NP205 is a phat worthless hog (tho unbreakable)...IMO, there are better choices for t-cases out there that won't kill your belly clearance...specifically, the D300 or the Atlas...
and, don't forget, only a Cruiser t-case likes your current offset rear diff, so you'll be changing rear axles regardless....
lots of decision, choose carefully
