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Was wondering what weight and oil is best to use to fill the transfer case on my 3500. It has the auto trans and was wondering. Also any preference on front and rear diff lube and is there any additives I should use as well? Also planning to install an egt sensor and hopefully a fuel pressure gauge. Thanks
 

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Can't speak to the Dodge (perhaps it's in your owner's manual) but I just serviced our '15 Silverado 3500 HD LTZ 4WD DRW Duramax this summer. Transfer case called for Dextron VI transmission fluid and we used synthetic 75W90 in both differentials. Also di the transmission while I was under there so it should be set for another 100K.
 
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