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I myself went though my Dana 80 last winter and did alot of reseach before buying diff lube and found that Mobil 1 Synthetic is your best bang for the buck. There were a couple others that tested out alittle better but cost 2x as much as the Mobil 1. A also added 6ozs of Motorcraft XL-3. The book calls for 8ozs.
I also put a chrome diff cover on it. My buddies say that Blackie (my truck) with DRW looks like a fat girl wearing a thong now. LOL She does!!!
Your probably right Rich. At least that is what I was looking for. Guys I know do love the Shaeffer products just hard to buy except in quanity. Changing the diff,. doesn't have to be done that often so 5 gallons is a waste for me. God Bless, Chet
Absolutely - I will probably have this bucket for another 5+ years. I wish they sold this lube in smaller quantities.