BigSix
Registered User
Just did the 30k mile rear end lube change with Mobil 1 75w-90 full synthetic. It held 3.5 qts to the bottom of the fill hole. Then I looked in the shop manual and it says fill capacity for the 10.5 AAM is 4.75 pints or just below 2.5qts. Then I looked in my shop manual for my '95 Dodge/Cummins and it says fill level is 1" below the fill hole. In bold it says "Caution, over filling can cause foaming and over heating". I replaced a seal in my '98 Dodge Cummins and have replaced one in my '03. It seems I've been over filling my axles thinking I was doing good. I went out this morning and sucked a qt out and fill level is now about 3/4-1" below the fill hole. I can see the reasoning for this as we don't really want the chunk slapping the oil at 700rpm. That would whip it into a suds in no time. We just want the ring to pick up oil as it dips in it. It'll splash into everything else as needed. Just wanted to pass those thoughts along...