Differential fluid of choice
#2
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You wanna use 75w-90 synthetic..I used royal purple in front and rear diffs at 41k and picked up a mpg. It's pretty spendy, about $18 a quart and you need 4 quarts but you're saving alot of money by doing them yourselves so I think it's worth it. It's pretty thin though so I'm not sure how it is if you're doing alot of towing.
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