Not hard, you need either a correct puller, or use a slide hammer w/a fabbed up thick washer that'll go inside the bearing's ID to pop it out. I just pull the bearings and seals at the same time.streetrodderbn said:
What you're probably gonna also find, is a worn axle. The ****ty set-up used by GM has the bearing using the axle OD as the "inner race" of the axle bearing. There are "axle saver" bearings available that uses a different portion of the axle for the bearing surface, if yours are too far gone.
Better yet are new axles from Strange, etc. along w/a C-clip eliminator.
Be aware that an axle will make noise for a variety of reasons- backlash, diff/pinion bearings, spider gears/shaft, low lube, etc. U-joints can be noisy. Unlikely, but ranny noise can telescope down the d-shaft, as well.