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Old Aug 21, 2023 | 11:13 AM
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friction modifier

On a 2011 Ford F250 with AOD transmission electronic limited slip do you need to add a friction modifier when changing the rear differential oil....thanks
 
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Old Aug 22, 2023 | 01:42 PM
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There’s a lot going on with your question, but here is my answer:

go To Walmart and get this:
Valvoline Flex Fill SAE 75W-140 Full Synthetic Gear Oil 1 QT Squeeze Pouch
https://www.walmart.com/ip/Valvoline...ouch/332258803

it will have it if you need it, and it does no harm if you don’t need it.

once you buy gear oil in a squeeze bag, you will never buy gear oil in a regular container again.

and the cost is downright reasonable

this is what I used in our edge’s transfer PTU which calls for 75w-140 and my expedition that calls for the same. Neither require modifier, but it does no harm.
 
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