Do yourself a favor and do NOT throw any more money at your factory axle than you need to. It just isn't worth it. In the end, you'll still have a Dana 30 housing and knuckles with a Dana 44 diff and axle shafts. Build it up all you want and the housing will still bend - I have seen it. Play hard enough and your factory locker will fail - this has happened to me more than once before finally upgrading to a real axle. RCV are over priced and they don't stand behind their axles the way they claim to. Don't believe me, ask jnabird here on the forum. Also, after time and use, they make horrible loud snapping noises that RCV claims is normal.
If anything, I would recommend that you play with what you've got and save up some money until you can afford to get a ProRock 44 with an ARB. Get it with standard chromoly shafts with full circle clips, don't waste your money on orange knuckles and get a HD tie rod like the kind Currie makes. This will give you the setup you really want for a set of 37s.