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56 Fury differential pinion seal
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Tony
Posted 2019-06-17 8:18 PM (#583600)
Subject: 56 Fury differential pinion seal



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Location: Falcon, CO
Hi All,
What is the diameter of the ring gear for 1956? O'Reilly Auto and Rockauto claim that the Fury came with a 303 had a 8 3/4" ring gear. I need to replace the pinion seal, and both say that National 7216 is the correct seal. I still have to pull the yoke and the old seal, it'll be a couple days before I get to it.
Any info will help,

Thanks,
Tony
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56D500boy
Posted 2019-06-18 1:42 AM (#583618 - in reply to #583600)
Subject: RE: 56 Fury differential pinion seal



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Tony - 2019-06-17 5:18 PM

Hi All,
What is the diameter of the ring gear for 1956? O'Reilly Auto and Rockauto claim that the Fury came with a 303 had a 8 3/4" ring gear. I need to replace the pinion seal, and both say that National 7216 is the correct seal.


And then again O'Reilly and Rockauto could full of Sh1t? Pretty sure those older (to 1957) diffs were 8 1/4" at least for everything smaller than an Imperial, e.g. Dodges and Plymouths. And then there was this:

ybshore - 2018-09-06 4:22 AM

Older (pre '57) 8-3/4 diffs will not fit into the true 8-3/4 ('57 and later) axle housing. The axle housing has a different bolt pattern for the carrier, the axles have different splines, and the axle bearings are all different. I've been looking for the pinion seal for my '56 Imperial and can't find a source. It's 2 5/8 ID x 3 1/2 OD. Can anyone send me to a lead? TY.


I think the rear diff seal that you are looking for for your 56 Plymouth (yes, I know it's a Fury - but it's not an Imperial) is a 3.11 inch diameter 663 602 (as shown below)



Like this one:

https://www.ebay.com/p/Rear-Axle-Pinion-Seal-1937-1957-Dodge-Plymout...

Or this modern one from SKF, i.e. 18880:

https://www.rockauto.com/en/parts/skf,18880,differential+pinion+seal...

https://www.rockauto.com/en/moreinfo.php?pk=1837032&jsn=3





Edited by 56D500boy 2019-06-18 1:46 AM
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Tony
Posted 2019-06-18 9:17 AM (#583627 - in reply to #583618)
Subject: RE: 56 Fury differential pinion seal



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Location: Falcon, CO
Thanks for the info Dave, I know the '56 diff looks like an 8 3/4, but could tell the case is smaller.
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56D500boy
Posted 2019-06-18 10:31 AM (#583634 - in reply to #583627)
Subject: RE: 56 Fury differential pinion seal



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Tony - 2019-06-18 6:17 AM

Thanks for the info Dave, I know the '56 diff looks like an 8 3/4, but could tell the case is smaller.


The issue of diff size is moot. You don't have an 8 3/4".

I have a NAPA/SKF 18880 in my hand. The spec are as in the link, i.e.

Width (in) 0.5
Shaft (in) 1.875
Bore (in) 3.105
Outer Diameter (in) 3.11

Should be the modern (no felt) equivalent of the OE 663 602.

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Tony
Posted 2019-06-18 11:13 AM (#583637 - in reply to #583634)
Subject: RE: 56 Fury differential pinion seal



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Location: Falcon, CO
Thanks again Dave, I have lots of local sources, including a company specializes only in seals & bearings.
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56D500boy
Posted 2019-06-18 11:27 AM (#583638 - in reply to #583634)
Subject: RE: 56 Fury differential pinion seal



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56D500boy - 2019-06-18 7:31 AM

I have a NAPA/SKF 18880 in my hand.
Should be the modern (no felt) equivalent of the OE 663 602.



In case you thought I was BS'ing about "in my hand":





(NAPASKF18880RearDiffPinionSealJune18_2019.jpg)



Attachments
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Attachments NAPASKF18880RearDiffPinionSealJune18_2019.jpg (115KB - 10 downloads)
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mobileparts
Posted 2019-06-18 1:09 PM (#583642 - in reply to #583600)
Subject: Re: 56 Fury differential pinion seal


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Did you get the correct one???? Do you still need it?????
I have EVERY MOPAR pinion seal ever used, including the impossible to find CROWN IMPERIAL !!!!!!!

Always best to simply call me --- Craig -- 516- 485 - 1935......
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Tony
Posted 2019-06-18 7:36 PM (#583672 - in reply to #583638)
Subject: RE: 56 Fury differential pinion seal



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Location: Falcon, CO
I believed you, the closest NAPA didn't have it, but I picked it up at the NAPA warehouse in Colorado Springs this afternoon. I'll be working on my friend's Fury Thursday.
Thanks again guys,
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Tony
Posted 2019-06-18 7:58 PM (#583675 - in reply to #583672)
Subject: RE: 56 Fury differential pinion seal



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Location: Falcon, CO
I just compared the measurements for National 7216 and SKF 18880, the measurements are identical except that the 7216 still uses leather instead of rubber.
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Tony
Posted 2019-06-20 7:48 PM (#583812 - in reply to #583675)
Subject: RE: 56 Fury differential pinion seal



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Location: Falcon, CO
Installed the new SKF seal this afternoon.



(100_9421rs.jpg)



Attachments
----------------
Attachments 100_9421rs.jpg (109KB - 9 downloads)
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56D500boy
Posted 2019-06-20 11:12 PM (#583823 - in reply to #583812)
Subject: RE: 56 Fury differential pinion seal



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Tony - 2019-06-20 4:48 PM

Installed the new SKF seal this afternoon.


Looks good.

Any chance that you counted the splines on the pinion shaft/pinion flange?

I am getting mine changed on Tuesday (I'm also going to a 58 style pinion flange and a 7260 type U-joint at the same time).



Edited by 56D500boy 2019-06-21 1:31 AM
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Tony
Posted 2019-06-21 9:07 AM (#583830 - in reply to #583823)
Subject: RE: 56 Fury differential pinion seal



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Posts: 614
500100
Location: Falcon, CO
I didn't, but I estimate 8-9, I can see 5 in the pic. Should it be 10?
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57chizler
Posted 2019-06-21 12:33 PM (#583835 - in reply to #583830)
Subject: RE: 56 Fury differential pinion seal



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All early 8 1/4" pinions are 10-spline.
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56D500boy
Posted 2019-06-27 11:45 AM (#584129 - in reply to #583812)
Subject: RE: 56 Fury differential pinion seal



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Tony - 2019-06-20 4:48 PM
Installed the new SKF seal this afternoon.


I had an 18880 installed in my 56 Dodge rear diff on Tuesday and I think that it is leaking. I am sure that the shop will say that because I provided the new pinion flange (yoke) *AND* the SKF seal, it's their fault.

How did you remove the pinion flange nut? I thought that I couldn't do it with the car on the garage floor (even jacked up with jack stands). Now I will probably have to redo the seal. :(

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