Dana Spicer specification for the D30JK is 32" max tires, and the D44JK Rubicon/Non-Rubicon is 34" max tires. Those specs are engineered on vehicle GVWR and "intended use." So, because they were engineered for smaller-than-preferred tire size - 35" tires or larger technically requires some sort of attention to some extent. Again, this highly depends on "intended use," the actual tire size chosen, tire weight (this varies dramatically between tire models) and your GVWR. In fact, most manufacturers of rings & pinions, bearings and lockers won't warranty their products if you run tires over the Dana maximum spec'd sizes - it's in the fine print (Yukon being one of them).
That being said, if I were to run 37's with confidence, and I intended
on going offroad (rather than just mall-crawling), I'd run nothing less than a front D44JK Rubi with sleeves, gussets and possibly trusses or get an aftermarket D44JK, such as the Dynatrac ProRock or Tera44 at the very least. The rear D44JK Rubi/Non-Rubi should be OK.
Of course, with 37-inch tires you're also opening yourself up to other issues like: proper lifts with adjustable arms; steering problems; ball joint wear; upgraded braking; etc. Nothing that can't be fixed by throwing a lot of money at it, though.
Also, I'm of the opinion that RCV shafts don't belong in the D30JK. The weak point of the D30JK, just like any small axle assembly, is the small size of the ring and pinion. Dana spec'd them for 32" tires! I wouldn't want to put a bullet-proof axle shaft like an RCV CV shaft or a chromoly in a D30JK axle assembly while running a set of 35's (or larger) just to 'grenade' the ring, pinion and carrier/locker... I'd rather break the axle shaft.