I ran my D30 for a long time on 35's with 5.13 gears, never having an issue with stock shafts, alot is in how u wheel. at the start i had no plans to go larger than 35's and if thats the case, the 30 will serve u well, just add some gussets and your good.. cheaper than a PR44. and will last, lots of guys running D30 with no issues. the 44 was due to the Trump Pitbull tire deal, 37's. just wanted more strength for the larger tires.
dont get over sold on the D44 plenty of guys run D30 with 35's and have never had an issue, unless ur hard on the skinny pedal u should be fine for a long while. just my .02 and experience. i actually ran it, wheeled it, no breakage. the 5.13 gears are tiny for a D30 but 4.88 would be just fine IMO.