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I'm going to through a SWAG here as I've been out of the game for a year now and don't get any reports on issues.
I think the rust is forming between the O-Ring and dust boot, and that the dust boot is allowing some humidity / moisture past it's sealing surfaces.
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Jack
Former Vehicle Test Manager - Friction Products
03 F350SC 4x4 6.0 Auto 5/30/03
Truck Modifications below in Pictorials on Facebook. Search in Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.
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