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Imma change my differential fluids on my truck, but i dont know if i have a DANA 60 or a DANA 80...but i do have 12 bolts on the differential cover, does that make it a DANA 80?
The rear is a Sterling/Visteon 10.50 and it takes 75w140 synthetic fluid and requires 4oz of friction modifier in the rear if you have a LS you can find out by looking at the data sticker on the door jamb any axle code listed with a letter in front of a number is a LS. The front takes 75w90 gear oil and it does not have to be synthetic but if you want go for it.