STLDAVE
Member
Drained and refilled my rear diff with Red Line 75W85 synthetic now that I've hit almost 46,000 miles. When cleaning off the drain plug magnet found a small metal washer, or shim. It's about 5mm across and paper thin; less than 1mm. Very easy to bend by hand. I don't know what this could be from. It shows no signs of damage like it was ripped off of something or broke, it is just bent in a few places. My diff has never given any indication that anything is wrong, so I'm not too worried. Other than that the flush and fill took less than one hour. Hardest part is pumping all that thick gear oil in. Interesting thing was it took almost 3.5 quarts to fill and the manual says 2.75 to 2.85 quarts.
Mine took too much too. Turns out the axle wasn't level so apparently it ran to one end of the axle, filling that end of the axle tube. Level your axle and open the fill hole. IF nothing comes out, you're fine. If it does, just let it drain until it stops.