No, i have seen them fail without any metal in the oil
But i missed out on something here and am a complete dickwad as i just now read that it comes from the back and that negates all i said about what i thought was the front dif.
The pop in the rear might just be from the slider system inside.
Easy system dont worry about it, its probably the gears popping a bit, you can adjust it with the cable on the black arm.
All it is is 2 axles with a bushing, if the bushing moves it connects the 2.
Ofcourse any weird noises require attention but this wouldnt worry me as much as the front dif for now.
Last edited by טים ירושלמי; 09-17-2019 at 01:24 PM.