CDIESEL

So I just moved down to florida this last week and had looked evertything over on my truck and there were no leaks. I get down here, change my rear brakes and notice the rear diff pinion seal is leaking. Dont have any mechanic
down here I can trust and have never done it, how bad is it to do?

white89gt

You have to be really careful getting the pinion nut in exactly the same spot and torque. Other than that it's not really hard. I know a guy over on The Ranger Station that did a write up on it. This is the best way to do it here in the link. I very strongly recommend using a Ford seal only. I can show you pics of why if you'd like, but it's by far the best seal. It's an 8.8 in the write up, but the same point can be used with any diff. Also... I always install a speedi-sleeve on the pinion flange to ensure a nice surface for the new seal.

http://www.therangerstation.com/foru...d.php?t=102444

white89gt

What I said above didn't get out right. You take the pinion nut 1/8" past the mark, not right on the mark. You need the mark though or you'll have to reset the pinion depth and change the crush sleeve.

CDIESEL

Okay appreciate it, any place you can recommend I look for the seal? Didnt see a ford one on motorcrafts site or rockauto....

white89gt

Which differential do you have? I'll see if I can find one.

CDIESEL

Okay, I have the 9.75

white89gt

If you have an 8.8, this is it:

http://www.tascaparts.com/ford/f-150...me=pinion-seal

(Hit send too fast, sorry)

The 9.75 is here:

http://www.tascaparts.com/ford/f-150...me=pinion-seal

ibd2328

iTrader: (2)

Prolly pick one up at ford for less than 20. Just make sure you have the tools and take precautions when unhooking the driveline.

ibd2328

iTrader: (2)

Its a pretty easy change, also dont forget a good puller (rent one if needed) and 1/2" or 3/4" tools are a must. I have broken so many 3/8" ratchets working on stuff during my build. Lots of busted kncukles, stitches, and beers.

ibd2328

iTrader: (2)

Sorry for the triple post, but you may want to look into a new dust cover too. Mine was cracked and actually ate into my new seal so just double check.