gsfitzsr
Member
Update: Took the vehicle to an authorized AAM repair shop in the Houston area. They do a lot of axles for the racing boys and big rigs. They drove the vehicle and told me not to worry about the noise when coasting down but did tell me to stop using synthetic based oils and stick to conventional oils. They buy oil by the drum and they've never used any synthetic oils in any axle they serviced. It's not a cost issue they told me but based on getting more life out of the bearings and gear sets.
So I drained the oil from my axle after about 700 miles and it was already nasty looking. It was still warm when I drained it and grey in appearance. When I let it sit overnight it turned to a black color but still looked nasty. I refiled with 85-140w conventional oil per their recommendation. I'm going to do the same with the front axle in a few days.
So I drained the oil from my axle after about 700 miles and it was already nasty looking. It was still warm when I drained it and grey in appearance. When I let it sit overnight it turned to a black color but still looked nasty. I refiled with 85-140w conventional oil per their recommendation. I'm going to do the same with the front axle in a few days.