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Pinion Seal - Thirdgen rear w/4th gen torsen diff

Old 01-24-2019, 03:17 PM
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Pinion Seal - Thirdgen rear w/4th gen torsen diff

So I'll be changing out a leaking pinion seal this weekend. I found THIS post:
For those using the yoke GM upgraded to ~2000, the Timken 7457N and 8610 will not work. the inner seal is too small. The seal for that one from GM is 12471523.

The pinion nut has been superseded by GM p/n: 88891763.

Hope that helps anyone.
I bought a new(to me) 10 bolt with a 3.42 torsen takeout from a 4th gen. Was set up by a local shop and it was in the shop owner's 91z. I don't know the years of which parts were used. Any quick tell or do I just need to poke and hope? They're not super expensive.... I could just buy 'em both.

FYI....just ordered one of each from the Advance. $37 bucks. I'll return one.

Last edited by Abubaca; 01-24-2019 at 03:24 PM.
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Old 01-24-2019, 03:49 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

Glad you posted this as I will be putting one together soon. I’ve bought all the parts but haven’t assembled so I don’t know if I have the right seal or not. Guess I could slide the seal over the pinion to see if it fits?
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Old 01-24-2019, 04:20 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

That info came from me. Easiest way would probably be to just measure the diameter of the pinion shaft. I don't know the measurements off the top of my head, but I'm sure they could be found online with the p/n's of the seals.

BTW, I got my seal from the dealership.

Last edited by blacksunshine'91; 01-24-2019 at 04:25 PM.
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Old 01-24-2019, 05:03 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

That info came from me. Easiest way would probably be to just measure the diameter of the pinion shaft. I don't know the measurements off the top of my head, but I'm sure they could be found online with the p/n's of the seals.
Yes sir, thank you. I thought the quote cited it as being yours. I see it does not.
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Old 01-24-2019, 05:05 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

I asked the counter guy if the seals were listed by diameter and he said he didn't have a dimension listed. Figured I'd just get 'em both and potentially save a trip while I'm wrenching.
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Old 01-24-2019, 08:47 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

Originally Posted by Abubaca View Post
I asked the counter guy if the seals were listed by diameter and he said he didn't have a dimension listed. Figured I'd just get 'em both and potentially save a trip while I'm wrenching.
For the cost, that was a smart move. You can always return the unused one when you're done. Beats running back and forth trying to get the right one.
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Old 01-26-2019, 06:29 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

8610 worked. ...I'll get the actual measurement of the pinion later.
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Old 01-27-2019, 06:37 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

Pinion measured 1.525"
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Old Yesterday, 02:05 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

I swapped out the pinion seal once on my 92 rs with open diff before I upgraded to a torsen. Started howling shortly after that and didn't fix the leak. My guest is if its leaking its not the seal its something else out of whack.
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Old Yesterday, 02:26 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

Torsen/rear has about 40k miles on it and has been sitting awhile. My observation was that the seal looked pretty dry. ...and it was definitely leaking FROM the seal. Is it fixed? I don't know, hope so. ...but I'm pretty sure it was the seal.
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Old Yesterday, 05:18 PM
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Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

Originally Posted by Abubaca View Post
Torsen/rear has about 40k miles on it and has been sitting awhile. My observation was that the seal looked pretty dry. ...and it was definitely leaking FROM the seal. Is it fixed? I don't know, hope so. ...but I'm pretty sure it was the seal.
Did you torque the new nut to 180ft lbs. I think that's were I messed up. Something to do with the crush sleeve.
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