I just did a re-gear on mine recently. I am prety good at mechanical things. My good friend and I did mine. Without his help I would have been clueless.
You have to figure out your pinion depth along with your backlash along with getting a proper gear wear pattern. If one is off you have to change shims in either your carrier, your pinion or both.
You have to have a set of set-up bearings for that axle too. Once you get all of that figured out you then have to press your new bearings on. These set-ups can have changes on any side of the ring or the pinion within only .002 of an inch or even less. His first set up he did by himself he had to change the setup close to 15 times. On my D44 it took about 8 times and my D30 took about 6 and that was being lucky. Now on your front axle you probably have a crush sleeve on it.
Now that is another pain to deal with. If you over crush it, you have to get another one. and try again.
Once again the noise you are hearing is probably the bearings and maybe even the pinion bearings. You can just change the bearings without changing your gear set-up. Just remember when you take the races out of the housing to keep track of the shims that might be behind the races. When you replace the carrier bearings you will have to do the same. These bearings for the most part have to be pressed off. Now if you decide to take this on by your self, I am sure there are plenty of sites that will be able to show you how but without the proper tools, it will be prety much impossible.