What size tires do you plan on running? That's a pretty penny to spend on a D44. I hate to sound like Pirate4x4, but I put a lot of money into my D44 and now wish I would've gone with a D60 instead. The money would've been much better spent.
What rear axle are you going to match it to?
How much is he spending on it?
The 44 is wider than the stock rear in your TJ obviously, so Devin has a good point asking what you're matching it with in the rear. Also, the width can be a problem if you are wanting to keep it street legal. It has a 5 on 5.5" bolt pattern, so you'll be buying new wheels... It is high pinion where your stock front is not, so it could cause clearance issues with your driveshaft and/or exhaust depending on your setup. There is no provision for an upper link on the driver side on the 44 like there is on your current 30, which can be remedied with fancy bracketry, or different suspension design.
My opinion is that you aren't upgrading much by swapping to the 44 over your current 30: the HP is nice, but has your current axle ever given you problems due to the low pinion? The real hubs/wheel bearings are nice, but when is the last time you broke a unit-bearing? The bigger R&P is cool, but when is the last time you had a problem with your 30 R&P? Plus, your 30 runs the exact same u-joints that the 44 has, so there is no strength upgrade at all there. In short, the benefits do not outweigh the effort, time and cost.
Keep in mind, that this is just my opinion.
