If it does have 3.73, you will have to regear the rear axle to 3.55 or the front up to 3.73. Personally I wouldn't do either. If you are going to regear, get something lower like 4.56. But that is a lot more money then you probably want or can spend right now. How much are they asking for the axle. Cause you will have around 800 an axle in upgrading gears. It is good to do this anyway but if you don't have the money to do it now, this axle may not be for you since it wont be a direct swap. I just upgraded to a d44 myself this week. I bought it for 600, but it came with limited slip, disk brakes, repacked bearings, new shocks, and extra driveshaft. So it all depends on what you have to spend and what price you are getting that axle for. I wouldn't pay more than 200 for that axle, since you will need to do so much to it.
edit: mine also came with 3.55 gears. So I didn't have to regear the front yet.