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Discussion Starter #1
I will be towing 10-15k pounds alot with temperatures over 100deg, so I am changing out my stamped steal rear diff cover for an alluminum one to cool a little better. Anthing I need to be aware of for the electronic locker? Lets here everones opinion on gear oils too.
 

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In my 08 F-550 it called for 75w140, I had fluid changed in my 11 F-450 and dealer said it took 80w90. I kept the stock diff cover, usually change to Maghytec it is well worth the money in my opinion. As for fluid I used the Schaeffer80w90 full synthetic.
 
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