Alright well if it fits ima consider it I wanted the heavy duty capacity of extra fluid but the more i read about its like a 50 50 gamble and its not needed or it is needed so ima have to make a call.

 

So i ended up doing it lol i bought these.
Genuine Gear Part 7086P - Ford 10.25-10.5in.Polished Aluminum Diff. Cover-RH2
Genuine Gear Part 6063P - Dana 60-50 Front Polished Aluminum Diff. Cover-RH2

My next question is how many qrts does each differential housing hold? and what weight goes in what end?

 

Very nice! 2.8 qts up front of 80W-90 and 4 quarts in the back of 75w-140 synthetic.

 

hmm is 75-140 thin? lol seems like it would be. I think it needs an extra qrt now front and back so ill need 4 qrts upfront and 5 in the back

 

The front cannot be overfilled. It will come out the fill hole. The back is different. You CAN add too much. 75w-140 is not thin by any means. Pretty thick stuff.

 

yah i know the back needs to be like a 1/2-1/4 inch from the bottom of the fill hole to be right around where it needs to be.

 

Bringing this back. I just received my 08 cover. Box part # 8C3Z-4033-A. On the cover, 8C34-4033-AA. I,m pretty sure the one I received is correct, but if someone can confirm #'s on theirs would be great.

Also wondered why many seem to use socket head cap screws instead of hex head cap screw? 5/16-18 x 1.25 correct"?

 

Yep, that is the right one. I used the socket style bolts because they were easy to find at the local hardware store...and less costly. That bolt size is correct as far as the 5/16 and the 1.25". Not sure on the thread...take one with you when you buy the new ones. I didn't save the packaging on mine...

 

Here are the capacities and fluid specifications for the various models (except F-350 dually and F-450...they were left out of the manual for some reason).

 

They are the coarse thread, 18 sounds right.
And I used allen head bolts because, I could. I think they look neater.

 

In a way you both are correct. To add to the confusion, the owner's manual completely left out the specifications for the F-350 and F-450 D80 rear axle. It goes right from F-350 SRW to F-550 and leaves the D80 trucks in limbo. (at least my 1999 and 2000 manuals are that way...)

Here are the pages that talk about scheduled maintenance (see link below)...
If one was to apply all the various schedules together, then only the SRW trucks with synthetic lube are designed for the life of the vehicle. Non-synthetic lube must be changed every 3,000 miles or every 3 months (who has THAT much free time on their hands?). As far as I know, Ford filled the Sterling 10.5 axles with synthetic at the factory so I guess they are REALLY saying NOT to use non-synthetic oil at all......but IF you are stubborn and want to use non-synthetic oil....then be prepared to change it frequently and often.

Duallies are a different story. Pg 2 says that F-450 and F-550 trucks need to have the rear lube changed every 50k miles if operated at near max GVWR or if used under the Special Operating Conditions on page 36. If you flip over to page 36, one of the conditions is towing....so by default almost all of us would apply.

So, what about the F-350 dually trucks? It doesn't really say anything in the manual about the service schedule so one could assume the lube is lifetime like the SRW trucks. However, the axle in the F-350 dually is the D80....the same axle that shipped with the F-450. The axle shafts themselves are different, as well as the wheel flange but I think the gear carriers are the same. Only real difference is the 350s usually have a 4.10 ratio while the 450s all came with 4.88. Maybe the 350 duallies are OK to run the lube for life but maybe not.

I don't put a lot of miles on my 450 so I'll probably change the fluid every 50k like the manual recommends. My SRW sees much more frequent use. I change the gear oil every 100k just because it seems like the right thing to do. I am on my third change on that truck. If I had a 350 dually, I'd change the oil every 75-100k to keep more in line with what the factory recommends for the 450 trucks.

Just my $0.02...

 

Oil weight for a 350 dually is 75-90 according to my manual. Also according to Dana for the D-80.

 

Thanks. I just found the info on Page 212 in my 1999 manual. Neither one of my 2000 manuals have it though....I wonder if they just messed up when printing the books for the 2000 models?

So, I noticed that in the 1999 manual they group the F-350/450 D80 trucks together. Would it be safe to conclude that duallies should have their rear axle lube changed every 50K if loaded heavy or worked hard?

 

So if I understand this thread or parts of it? The 2008 aluminum covers will fit my 2000 Ford super duty srw. My truck has the Sterling rear end. My truck has 200K on it and this will be my fourth change of the rear differential. I will use synthetic. The past two changes I have used the synthetic oil from Ford and I was told that was the same type of oil in it when I bought it in August of 1999. My problem is the rust on the rear differential cover. I have scraped, sanded, and painted it on previous occasions. Clay has some nice ones as does the e address mentioned in a previous post, I do not remember Riff Raffs prices right now but the other site mentioned earlier is $300 dollars I don't have at this time.

 

I just replaced mine a couple weeks ago and filled with Royal Purple......as an alternative I purchased the Sterling cover from RiffRaff at about $120 or so if I recall.......it is pretty nice, not as fancy as the nice billet ones, but it comes with all 12 bolts and RTV sealant......so it is a complete kit sans fluid.

Just wanted to throw out that option which is <$300

Steve