Rear end oil bad!?

[whtrapta]

At dealership now. Rear diff oil is black and nasty. Should this happen I thought these were sealed? Should it be covered under warranty. Only 41k miles

 

[hatfield44]

Diff oil darkens with use like any other oil. Does it smell burnt? At 41K I would expect it to be black. Black is always bettter than milky (water in the oil). Diff can't be sealed completely (has to vent somewhere). I think factory warranty dies at 36K.

 

[SPRSNK]

You have to change it regularly. Even more often if you "use" your Raptor. I change the gear box fluid in my race cars 2-3 times a year.

 

[blood]

Rear end oil is nasty even when new! Smell a new bottle. Black is fine like said above milky is bad.

 

[whtrapta]

Ok. I just heard these are sealed and didn't know when or if it needs to be serviced. I probably will put redline so it's good for a lot longer

 

[pirate air]

Sounds about right. Although I thought you had sheared an axle a while back, so the fluid is as old as that repair... I'm doing mine (and the T-case) at least every 20-25k. I also want to do a mag hytec cover, it holds a little more fluid, and has a drain plug. The factory cover has to be pulled to drain the fluid.

 

[Ruger]

I'm not fond of the "sealed" design at all. There's a fill plug but no drain plug. The only way to drain the thing is to pull the cover. Dumb, dumb, dumb. I ask you, whom does that benefit? Not the owner.

 

[Humvee21]

Do the fronts diff of the 2012's need to be flushed? If so, what intervals?

 

[treypal]

Sounds about right. Although I thought you had sheared an axle a while back, so the fluid is as old as that repair... I'm doing mine (and the T-case) at least every 20-25k. I also want to do a mag hytec cover, it holds a little more fluid, and has a drain plug. The factory cover has to be pulled to drain the fluid.

Pirate,

Do you have a link for the cover?

 

[pirate air]

Pirate,

Do you have a link for the cover?

Here's one at SDHQ

Ford Raptor 12-9.75 Mag-Hytec differential cover

Amazon

Amazon.com: Mag-Hytec Rear Differential Cover 97-12 Ford F-150 Truck w/ 12 bolt 9.75" Axle: Automotive

Four wheel parts

Mag-Hytec Part 12-9.75 - Ford 9.75 High Capacity Differential Cover