1500 Silverado differential problem

Silverado G80 differential locking mechanism problem occurs under 25 - 30 mph. Will post solution when solved, pretty sure its the locking mechanism.

I had no idea I'd have this many views and subscribers up to this point which is cool and thank you guys for taking interest in my video!

So I posted in the comments what the problem was but I'll write it up here too, it was the transfer! After all the troubleshooting I did with the diff the problem was fixed with an oil change to the transfer case. I replaced the diff with a limited slip type and problem still occurred. Then I remembered the service light for transfer was on but I ignore it! I didn't check out the transfer further then sold the truck, so my best guess is after lifting the truck for a tire change inclining the truck shifting the oil to one side with the transfer stationary, it shifted some components that were probably already worn causing them to go out of whack, causing this problem.

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