Ordered the 08 f250 rear diff cover... 1997 7.3 f250 10.25 anyone know the bolt size that I need to get for it to work... Home Depot? Any help is appreciated

 

Take a bolt out of your cover and match the threads to that and how ever thick the new cover is add that to the length

 

Do the '08 covers have a drain plug?

 

No drain plug on the 08 cover. Bolts you need are 5/16 x 1 1/4 length NC. This is an odd ball length, I found mine in allen head at home depot, but mcmaster has then in stainless and such, I'll probly switch them out at some point for stainless stuff.

 

Thanks for the input guys, I'll post pics tomorrow might be late, got 12 winterizations to do

 

5/16-20

1.5" long with Lock washer and flat works perfect

 

I just bought a G2 aluminum cover with drain hole. My factory diff cover was so rusty I hated to touch it. I also got a LubeLocker reusable gasket, which I prefer to RTV.

 

I don't see a reason why you would need a drain for the diff.
When I change the fluid I like the fact that the cover has to come off it give me the chance to inspect everything

 

Your post (from all these years ago) helped recently guide me in the right direction. It's actually 5/16x18. I went on a wild goose chase for 5/16x20 and it basically does not exist. But after several phone calls, and much internet research, I discovered it was 5/16x18 (thankfully, as that size is readily available at most hardware stores.)


5/16x18x1 was the perfect size for the thicker aftermarket cover mounting flange. The little 8mm wave lock washers were perfect fit as they were snug on the bolt and small enough diameter to fit inside the recessed holes on the new cover.


1993 F250 Sterling 10.25 rear.

This was the 3/8" hardware provided by the seller, next to the OE Ford 5/16" bolt.