Qrius

I have a 2004 F150. My garage floor tells me something is leaking near the back axle. I think my rear differential has sprung a leak? How serious is this? Is this a pricey repair? Thanks!

Stu Cazzo

Where is it leaking from? From the pic we can't tell if its from the front pinion seal running down or if its just the back cover gasket.

If its just the rear cover its just a simple gasket and swap old oil with new.
If its the pinion seal its a little more involved but not too bad.

Z7What

Chances are it's the pinion seal. Not very expensive to repair just need to make sure you torque the pinion nut correctly after changing the seal.

Wayne

Qrius

Thanks for the help, guys. I got back under the truck and followed the leak further forward. See these two pics. Is this the pinion seal?

Z7What

Yep, that's the pinion seal!!

Wayne

Qrius

Thanks, guys!

raski

I would mark the exact postion of that pinion nut before removing and torque it back to that position or you likely will have a whining rear end.