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I have a 2013 challenger rt, how can I find out what type and quantity does my differential need?.
 

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want to find out, what type of rear axle differential my car as, if its a standard or limited slip etc....I know I need 75w-90 I buy only amsoil products.
 

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Which one does it look like?

#1 or #2?


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So that's a Getrag limited slip, the 75W-90 is good (need 2 quarts) and will also need a bottle of the Mopar limited slip additive.


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Don't you just full a differential up to the fill hole? I know on old cars if you remove the fill plug and can stick your pinky in the hole and touch fluid it is good.
 

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So that's a Getrag limited slip, the 75W-90 is good (need 2 quarts) and will also need a bottle of the Mopar limited slip additive.


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This^
Put one bottle in, then the limited slip fluid, then start the next bottle. Probably will only get about 2/3 to 3/4 of the second bottle in. Fill till it trickles out the fill hole and wait till it stops before sealing it up. Make sure the car is level when doing this.


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Doesn't Mopar make the the differential fluid with the friction modifier already added?
Yes but it's high dollar and some say they still had to use the additive so it's a tossup. Last time I used Royal Purple with half bottle of TransX and works great.


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