Need E-450 rear axle repair in Seattle area

pauldub wrote:
I think I have some noise that sounds a lot like tires singing; however, I've about convinced myself that it isn't the tires since the sound is from the rear and I have the same tires all around. No vibrations at all. I've cleaned metal off of the fill plug magnet several times in the last 10K. It'll build up to about 1/16" thick on the magnet. I've got powder, small glitter, and some black flakes that don't look like metal but they are magnetic. I'm in Lynnwood, just barely. Probably 2-3 miles from Randy's which I also drove by almost everyday before I retired.

Any idea if you have limited slip? That actually sounds exactly like clutch pack material. My plug gets the exact same buildup. If you do have limited slip, that metallic sludge is perfectly normal.

BTW - that same sludge can build up on the speed sensor. I have to periodically clean my sensor off too, because that sludge can trigger the ABS light when it gets too thick.