Which one are you talking about? The OEM DOES NOT have a drain port but the Ebay does just like the Jeg's. From the EBay ad:

ALUMINUM 1986-UP FORD STERLING F-250-F-350 REAR DIFFERENTIAL COVER 10.5" RG 12 BOLT - BLACK

Ford Sterling black aluminum rear differential cover with 12 bolt pattern. Fits 12 bolt Ford truck rear ends with heavy-duty Sterling 10-1/2" ring gear. Includes bolts and drain plug.
HZ-5079 differential cover fits:
1986-UP Ford E-250 Van 2WD/4WD - Rear.
1986-UP Ford E-350 Van 2WD/4WD - Rear.
1986-UP Ford F-250 Truck 2WD/4WD - Rear.
1986-UP Ford F-350 Truck 2WD/4WD - Rear.
1999-UP Ford Excursion 2WD/4WD - Rear.

I would be buying the OEM AL cover. Regardless of the drain port.

Issue is the pattern of spray to spread the lacrimation completely.

Hey Senix, you see this from my Sterling thread:

https://www.ford-trucks.com/forums/1...l#post18872036

Interesting that the new 17's plus use 75w85 for the same Sterling 10.5 where I use 75w140.

Yes I read that. Interesting, I can only speculate it is due to higher towing limits but also different components to get there allowed for a different line requirement

I will be definitely going for the Lubelocker gasket, need to find a cover for the front to match the OEM rear.

[QUOTE=senix;18872255]Yes I read that. Interesting, I can only speculate it is due to higher towing limits but also different components to get there allowed for a different line requirement[/QUOTE]

Yeah it makes you wonder, huh?

My guess would be to increase FUEL ECONOMY, just like the gradual reduction of specified oil viscosity in engines that has taken place over the last 25 years.

As the formulations of lubricants and synthetics improves, and as the costs are lowered from volume efficiencies and lower cost formulations (hybridized synthetic bases), and as time and testing proves out the efficacy of less viscous synthetics still meeting the lubrication needs in high temperature operation... the specified weights of oils have dropped to reduce rotational resistance and thereby incrementally contribute to the constellation of increased efficiencies that result in better fuel economy.

Or the copywriter made an error. Not like that hasn't happened before .....

Or if they changed any components in the axle they may have had to change the spec.

Funny, that was my first thought too. Must be a typo.

Just checked it out. Redline, Valvoline, Castrol, Motorcraft, Honda, Mercedes and others make a 75w85. Hmmm...

I went to my local Ford dealer where I bought the truck and got the part numbers for the differential covers that fit my truck (2016 F350). Here is what I could decipher. f82z 4033aa duel, bc3z 4033c duel, estz4033a steel, the one on my truck, bc3z4033b ??? Bc3z4033a is the aluminum cover you see for sale all over the Internet. I could not find anything on bc3z 4033B. Anyone have a description on the Ford number? I need to go back to Ford tonight so I may see if he has any more information. Thanks