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Rear End Differential Fluid

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Old Oct 19, 2016 | 02:58 PM
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Rear End Differential Fluid
I need to change my differential oil and I can't find anywhere what type of oil to use. Chilton book doesn't say and neither does the manual. 1993 F350 7.3 IDI, RWD, C5 axle code, 4.10 ratio. Anybody know?
 
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Old Oct 20, 2016 | 02:08 PM
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I imagine its the standard 80w90. Now the important question is if C5 is open or limited slip because if it's limited slip you'll need to add in that additive.
 
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Old Oct 20, 2016 | 02:16 PM
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Axle Code C5 is a 4.10 ratio with limited slip.

Ford Part Number for the gear oil is XL-80W90-QL

Ford Part Number for the friction modifier is C8AZ-19B546-A
 
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Old Oct 20, 2016 | 03:24 PM
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Originally Posted by rla2005
Axle Code C5 is a 4.10 ratio with limited slip.

Ford Part Number for the gear oil is XL-80W90-QL

Ford Part Number for the friction modifier is C8AZ-19B546-A
Awesome! Thanks, where did you come across the info?
 
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Old Oct 20, 2016 | 03:55 PM
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My Ford Service CD.
 
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Old Oct 20, 2016 | 04:46 PM
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Is it 85-140 for severe service?
 
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