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Early Bronco

I just changed my RDU fluid at 85000km because rear was shuddering and not disengaging. The fluid was pretty burnt, a lot of sludge on the drain plug, and some hard bits that may be sand. But there’s also these prices of clear or white plastic. They look like tiny tubes or something that broke apart. Does anyone know what this would be?

Ford Bronco Sport What's in my RDU fluid? 20260730_145106

Ford Bronco Sport What's in my RDU fluid? 20260730_145106

Ford Bronco Sport What's in my RDU fluid? 20260730_145052

Ford Bronco Sport What's in my RDU fluid? 20260730_145052

Ford Bronco Sport What's in my RDU fluid? 20260730_145119

Ford Bronco Sport What's in my RDU fluid? 20260730_145119

I just changed my RDU fluid at 85000km because rear was shuddering and not disengaging. The fluid was pretty burnt, a lot of sludge on the drain plug, and some hard bits that may be sand. But there’s also these prices of clear or white plastic. They look like tiny tubes or something that broke apart. Does anyone know what this would be?