I've also not had any trouble with the aluminum diff and an LSD. I take it off-road and get the occasional wheel in the air. I also drive it like a jeep, not a Baja or KOH competition.
The pinion gear is a different length on the 30a. The bearings will not be in the right place if you try to use normal 30. Yes they are hard to find and 4.10 is the lowest available. I had to drive over 4 hours to pull mine out of a junkyard.
Can't say for sure, but I think the cover is the same as the housing size and shape is the same. You could look up a gasket and see if that same part number also fits the other.
I apologize if this was already stated.at the time I bought my timken wheel bearings with abs they only offered one part number to fit left or right. The abs wire does come out directionally but was very easy to route on both sides regardless. Been running smooth for years now.
The damage usually happens when you get a front wheel off the ground spinning at high rpm and then suddenly coming down and getting traction or when the differential moves power from one wheel to the other quickly under power such as high rpm through mud or snow. If driven responsibly you should...
If your Jeep is 2005 or later the "bearing" is actually more of a plastic bushing. It can be replaced with the needle bearing that comes in the earlier models. Inspect your cv splines that plug into the diff while everything is apart.
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