Rear pinion seal replacement

[keithrash]

has anyone replaced the rear pinion seal? I've got to replace mine on my 04 f250 xlt 4x4...

how hard?

[merv dessent]

well its straight forward really but the problem I find is that the yoke needs a good heavy duty puller and some serious grunt to move it off the pinion shaft.
Hear is normal proceedure anyway
Soak nut and yoke in WD40 or Blaster
Mark the position of the pinion nut before you start with hacksaw blade or file, when you tighten the nut back up you will want the nut to turn to that original position
Remove the driveshaft and mark that as well so it goes back in original position.
Get a good puller and get pulling on that yoke.
You may be lucky
Remove oil seal , grease up new one (FORD OEM)
and install with large socket to the original position that old seal was seated.
Tighten up yoke nut to the same position
Re install drive shaft
I have had them leak again straight away and had to replace but that is unusual.
Good luck keep your cool and you will get it done
Merv Dessent

[artsamm]

Originally Posted by merv dessent

Mark the position of the pinion nut before you start with hacksaw blade or file, when you tighten the nut back up you will want the nut to turn to that original position

Merv Dessent

You can try white out too

[keithrash]

Originally Posted by merv dessent

well its straight forward really but the problem I find is that the yoke needs a good heavy duty puller and some serious grunt to move it off the pinion shaft.
Hear is normal proceedure anyway
Soak nut and yoke in WD40 or Blaster
Mark the position of the pinion nut before you start with hacksaw blade or file, when you tighten the nut back up you will want the nut to turn to that original position
Remove the driveshaft and mark that as well so it goes back in original position.
Get a good puller and get pulling on that yoke.
You may be lucky
Remove oil seal , grease up new one (FORD OEM)
and install with large socket to the original position that old seal was seated.
Tighten up yoke nut to the same position
Re install drive shaft
I have had them leak again straight away and had to replace but that is unusual.
Good luck keep your cool and you will get it done
Merv Dessent

thanks for the step by step!
it'll help...

[sand41]

I had mine replaced a few months back but went to the dealership to get it done, the critcal part in replacing the seal is having the yoke torqued correctly, I believe it was around 150 bucks parts and labor.

[keithrash]

Originally Posted by merv dessent

well its straight forward really but the problem I find is that the yoke needs a good heavy duty puller and some serious grunt to move it off the pinion shaft.
Hear is normal proceedure anyway
Soak nut and yoke in WD40 or Blaster
Mark the position of the pinion nut before you start with hacksaw blade or file, when you tighten the nut back up you will want the nut to turn to that original position
Remove the driveshaft and mark that as well so it goes back in original position.
Get a good puller and get pulling on that yoke.
You may be lucky
Remove oil seal , grease up new one (FORD OEM)
and install with large socket to the original position that old seal was seated.
Tighten up yoke nut to the same position
Re install drive shaft
I have had them leak again straight away and had to replace but that is unusual.
Good luck keep your cool and you will get it done
Merv Dessent

sounds like removing the yoke is the hard part...

was the old seal hard to remove?

do you know what the torque of the yoke nut is?

[merv dessent]

removing the seal is straightforward
Mark the nut to casing before you undo the nut.
That way you get the correct pre load.
This is not rocket science but if you have any doubts get it done by a shop.

[Jungleman]

I just did mine on my 2006 F250. Mine has a 10.5 inch rear. If yours is the same the only tips I would give you are.

If you don't have a ½ inch air gun you are going to have to really work to get that pinion nut off, and the yoke too.

Before you remove the nut count the number of threads exposed and put the new one back together with the same number of threads exposed.

The Chilton manual says to take a torque wrench and measure the turning resistance of the rear with the calipers removed. Then after you get everything together it should be about the same. Do not over tighten the nut, because they say you will have to throw it out and use a new one if you have to back it off any.

That yoke is a problem to get off. You will need a pretty good puller and an air gun for that too. I used a three prong.

Make sure you install the seal straight. I used a piece of pipe because I didn't have a socket that was large enough.

It really isn't that hard to do, it just takes some time.

[MoyockPowerstroke]

I did mine a while back...here are the pics...hope they help.

Ford Truck Enthusiasts Forums - MoyockPowerstroke's Album: Rear Pinion Seal replacement

[keithrash]

Originally Posted by merv dessent

removing the seal is straightforward
Mark the nut to casing before you undo the nut.
That way you get the correct pre load.
This is not rocket science but if you have any doubts get it done by a shop.

Thanks!
I'm gonna do it on my own...pretty confident. just wanted to get the most info before doing it.