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Discussion Starter · #1 ·
So I've been slowly reviving my dad's old mk3 and one of the last things that needs to get fixed is this pesky differential leak. At first I figured it was the cover seal leaking so I replaced that, but afterwards it was still leaking. After further inspection it looks like it's coming out of the sides of the differential. What seal would this be?
 

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1987 Toyota Supra
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Seal part number.
90311-43001

Pull stub shafts with a slide hammer.
Remove old seal, pound in new seal with a seal installer.
 

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Discussion Starter · #3 ·
Seal part number.
90311-43001

Pull stub shafts with a slide hammer.
Remove old seal, pound in new seal with a seal installer.
I purchased that part, but it looks different than the old seals. The new one is a lot bigger (left) and it won't fit
PXL_20210507_020519117.jpg
 

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The old seal looks completely shot, the material is separating all over.
That's honestly the worst looking seal I've ever seen.
Unless Toyota packaged the wrong part in the box (I've seen this before) 90311-43001 is the correct seal.
It interchanges with 90311-43009.

Unless your diff is something strange I've never seen before, I've rebuild 50+ of these diffs.
They all take the same seal, & have to be hammered into place.
Tight interference fit.

How much rust is in the ID bore on the housing side?

Example photo from one I rebuilt recently:
 
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The more I look at your photo the more it looks like the steel center core of the old seal is not pictured.
Appears to be completely separated.
My guess is you still have to remove the remaining parts of the seal that are still stuck in the diff.

One you take care of that you will be able to get the new one in.
 

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Discussion Starter · #6 ·
Hmm... interesting. I will take another look inside when I get back home. Does the new seal on the left look like its the right part?
 

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The metal ring of the seal is still stuck in there.
Pry it out.
 
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Din you finish installing the new seals?
 

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Discussion Starter · #10 ·
Yes I did! Sorry for not responding- life has been crazy lately. No leaks at all anymore with the new ones in! Thank you very much for all your help! I really appreciate it!
 
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