What I can tell you is that about 10 years ago, everyone was running 1310 shafts including me. It's what people were running back in the TJ days and hey, it would act as a "fuse". What I can tell you is that there is a reason why so many of us now run and recommend 1350 shafts and that's because over the last 10 years, we have seen plenty of blown fuses but by comparison, few blown shaft or ring and pinions and this IN SPITE OF running 1350. If numbers more than experience helps you to sleep better at night, a 1310 is what you want.
Speed will kill your factory 44 front axle housing more than any rock crawling you could ever do. So long as you take it easy, you should be able to get yours to last with 37's for a while and really, if a time comes when you find it necessary to replace, you can always get a ProRock 44 made for Rubicon internals for about $1900. That's what I ended up doing on Rubicat.