[AMG1978]

I don’t see any 80w-90 full syn at local parts stores but I do see 75w-90. Any concerns going full syn 75w-90 in front diff or do I need to stay w motorcraft 80w-90?
2011 6.7l srw 4x4


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[Calif250]

You shouldn't have any issues there. Especially since the front rarely gets worked when 2wd most of the time.

 

[AMG1978]

You shouldn't have any issues there. Especially since the front rarely gets worked when 2wd most of the time.

Thanks

I suppose w that, does it make sense that I could take the cover off in my inclined driveway, clean the cover as I should, and the face of the diff, reinstall the cover w the permatex gear oil rtv, let it dry 2-3 hours, then back my truck down to the flat street, get under, fill it properly, then put it back in the driveway? The diff isn’t engaged cuz it’s in 2H.


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[Jimmy's Pilot Service]

Or after the cover is set just put the proper measure amount in on the incline, back out to flat and verify.

Keep it simple.

 

[01yellercobra]

I'd pick up a Lube Locker gasket to use in place of RTV. Less mess and works really well.