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Discussion Starter #1
whats the best diff oil to run in the rear end of an 89 F350??

don't really know anything about it so would like some input
 

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I was wondering around discount auto parts today and thinking about the same thing for my 97. There are several to choose from I hope you get some input on this soon.
 

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I'm getting ready to change mine over to Amsoil Severe Gear 75-140 in my 97 F350, but I'm a dealer so I'm a little biased. lol
 
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