Ok guys so I am going to change my differential oil, since i am changing the cover and was wondering what type of oil would you guys use.

tried the search feature, but they are all threads for engine oil.

I know i need 75w-140 and no friction modifier(open differential =(

 

I run straight royal purple gear oil.... Costs a little more.... But worth it.

 

im using lucas... http://www.lucasoil.com/products/dis...d=293&loc=show

 

how much does it run you. since it is $45 for a gallon or four quarts at my local auto parts store? Ehh im going to give lucas oil a try. Mobil 1 was way too expensive and so was royal purple.

 

I use Valvoline HP 80W-90 in both the front and rear. I'm running TrueTracs, though. They are like an open diff.

 

They RP is a little more expensive, but it already has the LS Friction Modifier in it. Might want to read on that Lucas Oil to see if it already has that in there or not.

 

but i have an open differential, doesnt that mean that friction modifier isnt needed?

 

Sorry, I'm not the right person to ask lol. I really don't have a good understanding of the inner workings of differentials. I just know the basics of how they transfer power.

But someone with more knowledge will come along I'm sure!

 

That is absolutely correct. It won't hurt anything, on your open diff, though.

 

its like $10 bottle. you need 3.

google lucas oil 75w140

http://www.buylucasoil.com/viewitem.asp?itemid=10121

and lucas oil website says: "Excellent for use in "Limited Slip" differentials. No special additive needed."