Likely then the tech was wrong and some damage has occurred.
(sometimes it's hard to see) Gear sets are expensive and so are bearings. Only people with the proper tools and experience should attempt a rebuild.
Most often you can find a good used unit end to end in a scrapyard for under $200. (I haven't paid more than $125 for any I have gotten lately). You can put your new axles and hub bearings on the new unit or save them for spares.
One very important thing is to exactly match the gear ratio of the one you are replacing. There should be a tag on the diff cover or you can count the ring gear teeth and divide by pinion tooth count to get that #. Some are also stamped on the edge of the ring gear as well. It takes about a day for an average person (with a helper) to remove and install one on the ground providing you have decent tools, jacks and a bit of experience. Far less time on a lift with power tools.
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Since you replaced the axle seals, I assume you had the diff cover off. Was there any metal in the diff lube? Before the repair had the diff run low? Most often howling is due to low lube level but wear of the diff gears is also happening while low. You can replace the lube but that will not fix the worn parts. Also, check the transfer case and rear diff levels as well.
The diff had run low because the seals had blown out. The gears were not replaced because the mechanic said they were not that bad. The transfer case and rear diffs were checked and both were good...
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