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3.73 gears 9.75 diff max tow.

Csvt18

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I’m going to swap out my rear diff cover with the spicer version and want to change the oil. My trucks a 2022 f150 with the noted gears and diff in title. Dies it come with 75w90 oil?

I’m looking switching to 75w140 as I tow a 7000 lb camper several times during spring/summer. Just concerned how it’ll do here in Michigan winters.

also majority of gear oils add in friction modifier. Is that going to hurt my E locker in any way? I know I’m not “supposed” to use it but even amsoil adds it.
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Ranger621

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????n I have the same rig and a 7000 pound Flagstaff.
 

HammaMan

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Wish banks made their diff cover for the 9.75! Ever since they started getting the JLTV engine contract they've just slowed down on their typical aftermarket parts.
 

Mosey

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Ford rear diff lub is 75w85.
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