Facebook page is good, but it would be much better to have a section on here.
The thing with the Facebook page is as soon as a issue is resolved, the post quite quickly vanishes, hense the same questions getting asked over again. Yes you can do a search but it's not easy to browse like a forum is.
The thing with having a seciton on a popular forum is everything is automatically archived so there's tonnes of information is there right away.
If your diff is kit, it will have a steel axle. Alloy axle is an optional extra to save 18g. The purple part of your diff is just the hub.
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