I noticed on a recent video that one guys driveshaft was all rusty looking. But mine still looks new. Did they do this when switching to the non-finned cover?

 

Mine is manufactured 5/2010 and has the aluminum drive shaft and differential cover.

 

2011 F-350 SRW manufactured 12/10.
My driveshaft and differential cover are made of rust.
I never noticed that until now. The finned aluminum differential cover must have been a carryover from the 2008-2010 models. I'm disappointed now!

 

Doesn't it depend on the wheelbase of the vehicle?

 

Possible that the two piece driveshaft on the long bed are steel. Can anybody confirm that? Mine is a 6/10 build SWB. I have the alu. Driveshaft and cover

 

Above truck is a long bed, 3.55 locking diff.

 

Mine is SWB build date 8/11, has alum shaft but steel cover.

 

I know 2wd are steel.

 

Finned diff cover comes with the camper package.

My truck has a 6/11 build date and have alum drive shaft. No finned cover since it doesn't have the camper package.

 

Build date of 07/10. SWB F250 4X4, no camper package, aluminum shaft and finned diff cover. 3.55 e-lock, lariat ultimate.

 

Mine is finned, no camper or snow plow prep package.

 

I have Short wheel base 11,500 GVW finned cover on my rear end, don't recall what the driveshaft looked like, I'll take a look in the daylight

 

Crewcab, long bed, FX4, steel driveshaft and finned cover. Truck was built 9/26/10. No camper package, no snowplow package.

 

Still early in the poll but sure looks like the long wheel base gets steel shafts. Finned cover seems random though. My money is on PowerstrokeHD telling us the facts!

 

Does the diff cover have anything to do with the locking rear axle? Mine has aluminum driveshaft and aluminum cover, with locking rear diff, shortbed.