2003 Dana 50 inner seal - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 16 (permalink) Old 05-19-2019, 03:26 AM Thread Starter
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2003 Dana 50 inner seal

Hey guys have been looking for the part number for the inner seals for my Ex. Tried to find them through spicer and got 52148 but some sites are telling me thatís not right. I would just like a general consensus on the proper part number through spicer. I think the ford part number is Ď2C3Z3254AAí. I was told/read that the spicer version is upgraded to seal better.



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post #2 of 16 (permalink) Old 05-19-2019, 02:01 PM
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Re: 2003 Dana 50 inner seal

Here is the one they try to sell you at all the parts stores, this is known as the "two piece" seal. personally I DO NOT like this design. They did not last in my 97 truck and are difficult to install.
With this style the seal actually rotates, one piece sticks to the axle shaft the other stays tight to the housing. Lots of things can go wrong here.

https://www.rockauto.com/en/moreinfo...414921&jsn=511


Another two piece:





This is the style I prefer for the dana 50 or Dana 60, this was OEM on the old trucks






FYI the dana 50 and 60 use the same inner axle seals.
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post #3 of 16 (permalink) Old 05-20-2019, 01:33 AM Thread Starter
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Re: 2003 Dana 50 inner seal

Awesome, I see other people agree with that statement. Iíll get the single piece ones ordered.

Iím also reading that the seal donít have a stop in the housing. How do you install them? Do you use the special tool or did you create something?


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post #4 of 16 (permalink) Old 05-20-2019, 12:28 PM
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Re: 2003 Dana 50 inner seal

I used a seal driver kit from harbor freight and a length of pipe if I remember correctly. Driving the seals in was not difficult. Also anaerobic sealant on the outside of the seal to help fill any imperfections in my diff housing. The axle shafts themselves should be very clean and I lube them with some vaseline before they pass through the new seal.
No special tools needed that I remember, the seal driver kit is nice to have but not always necessary (usually you can find a socket or something of the same size as the lip of the seal)
Putting the 3rd member back in by myself was the hardest part, but it went right in with some effort (get your body in the right position)
I had to do my seals twice, the drivers side started to leak right away.
The auto parts store sold me two seals, one was the two piece, one was the one piece. My dumb ass went out and bought another of the two piece seals, installed both of those....one leaked. So that's when I researched the two different types and decided with the help of this forum, to use the older style.......now no more leaks. The two piece seal is for the birds in my opinion. I like the old school design, the big funnel is shape part is what keeps debris from your axle tube from getting into the seal and causing problems.

Forget about the outer axle tube grease seals, those things are a joke....they never hold and you will always see them dangling like a loose donut on peoples axle shafts....

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post #5 of 16 (permalink) Old 05-20-2019, 08:20 PM
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Re: 2003 Dana 50 inner seal

A little tip from overhauling ranch trucks and having mud bogging family members- I like to find a piece of foam pipe insulation that fits the axle shaft and the housing, a piece about 5 in long, glued to the axle, greased where it meets the tube. Helps keep dirt away from the seals, also makes installation without damaging the seal easier in my opinion.

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post #6 of 16 (permalink) Old 05-21-2019, 12:11 AM Thread Starter
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2003 Dana 50 inner seal

Just pulled the shafts, havenít knocked the old seals out yet.

The shaft looks like this on the passenger side.



Do you know if that rust spot is where the seal rides? Iím not sure how the 2 piece rides on that vs the 1 piece and if itís even going to be an issue.


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post #7 of 16 (permalink) Old 05-25-2019, 01:17 PM
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Re: 2003 Dana 50 inner seal

it looks to be just outside where the seal rides. Look really closely you can see the inner and outer "ride" marks where the seal was, the pitting appears to be just outside the seal lip

I would clean it up with some emery cloth or scotchbrite

I really really like the foam idea!

The dust seal from Ford never holds.....and if you let debris and mud in there eventually it will bitch up your inner seal!

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post #8 of 16 (permalink) Old 05-31-2019, 01:10 PM
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Re: 2003 Dana 50 inner seal

Quote:
Originally Posted by 410customs View Post
The dust seal from Ford never holds.....and if you let debris and mud in there eventually it will bitch up your inner seal!
The upgraded seal.

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post #9 of 16 (permalink) Old 05-31-2019, 02:31 PM Thread Starter
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Re: 2003 Dana 50 inner seal

This the upgraded inner seal?! Why have I not seen this? This looks like a great compromise between the two seals!

I went ahead and just tapped it in. I think itís a little crooked but I couldnít do much about that with what I had...

So far no leaks, not that that means anything.


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post #10 of 16 (permalink) Old 05-31-2019, 08:21 PM
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Re: 2003 Dana 50 inner seal

No, that is the upgraded "dust" seal it goes inside the axle tube out by the knuckle.
It purpose is to keep debris out of the axle tube that can effect the grease seal, which is the one that holds the lube inside the differential

I like how it has 3 sealing rings...I will try those next time I am sure I will have to do these again in my lifetime since I have a Dana 60 in my 97 a dana 50 in the excursion and I plan to install some sort of 4x4 into the E350

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