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Old December 3rd, 2008, 05:27 PM   #1
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Default TJ Shaft in a Disconnect D30

Flexin has a 1991 YJ with a stock dana 30 front. He brought it to a shop and the shop said his axle was "odd" inside. Its leaking bad, so I'm going to help him fix it tonight. I'm going to go get him some seals. Was that year just a standard disconnect?
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Old December 3rd, 2008, 05:32 PM   #2
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Originally Posted by clarkstoncracker View Post
Flexin has a 1991 YJ with a stock dana 30 front. He brought it to a shop and the shop said his axle was "odd" inside. Its leaking bad, so I'm going to help him fix it tonight. I'm going to go get him some seals. Was that year just a standard disconnect?
Yes, the problem is that inner disco seal is a bitch to install without a tool. You may want to get a 3 foot piece of threaded rod, some big fender washers and nuts to pull it into it's cavity.

There is certainly no room to hammer it in.

The driver seal in the diff can be pulled into place the same way.
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Old December 3rd, 2008, 05:40 PM   #3
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I guess the vac disconnect shaft was removed and had a tj shaft installed in place so I'll grab two non-disconnect side seals.



Thanks for the advice on the driver seal
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Old December 3rd, 2008, 05:43 PM   #4
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won't work there is a different seal for the disconnect side
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Old December 3rd, 2008, 06:05 PM   #5
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Originally Posted by 99grandtj View Post
won't work there is a different seal for the disconnect side
Isn't it the same OD?

I had a vac disconnect 44 at one time, and I thought the seals were the same od.

Sounds like the previous owner took out the vac disconnect and put in a TJ shaft.. I'm guessing TJ/YJ 30 shafts are the same diameter.
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Old December 3rd, 2008, 06:31 PM   #6
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Originally Posted by clarkstoncracker View Post
Isn't it the same OD?

I had a vac disconnect 44 at one time, and I thought the seals were the same od.

Sounds like the previous owner took out the vac disconnect and put in a TJ shaft.. I'm guessing TJ/YJ 30 shafts are the same diameter.
The YJ's are not machined in the passanger side tube for a seal like the driver is... you need a seal with a smaller OD.

A seal that fits is Napa part #CN11771 per SuperYuper here

That is of course unless someone ground the ID to fit the stock seal in there... then you would want a stock seals *lol* If this is the case, you possibly found your leak and may need to RTV it in. Or maybe they just pounded the stock seal in the smaller OD tube and it's all crinkled...

At any rate it sounds like a blast *lol*
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Old December 3rd, 2008, 06:36 PM   #7
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Originally Posted by clarkstoncracker View Post
I guess the vac disconnect shaft was removed and had a tj shaft installed in place so I'll grab two non-disconnect side seals.



Thanks for the advice on the driver seal
If your pulling the carrier you can also use about 37 extensions and a big ass socket and hit the seal into the tube from the other side...

Or get a round flat something or other, weld it to a piece of 1.25 tube and make a seal driver that you will have forever for all inner axle seal driving needs.
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Old December 3rd, 2008, 06:45 PM   #8
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Originally Posted by Monkeyevil View Post
If your pulling the carrier you can also use about 37 extensions and a big ass socket and hit the seal into the tube from the other side...

Or get a round flat something or other, weld it to a piece of 1.25 tube and make a seal driver that you will have forever for all inner axle seal driving needs.
did that
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Old December 3rd, 2008, 07:40 PM   #9
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Quote:
Originally Posted by Monkeyevil View Post
The YJ's are not machined in the passanger side tube for a seal like the driver is... you need a seal with a smaller OD.

A seal that fits is Napa part #CN11771 per SuperYuper here

That is of course unless someone ground the ID to fit the stock seal in there... then you would want a stock seals *lol* If this is the case, you possibly found your leak and may need to RTV it in. Or maybe they just pounded the stock seal in the smaller OD tube and it's all crinkled...

At any rate it sounds like a blast *lol*


Awesome.. thanks for that part number.
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Old December 4th, 2008, 12:18 AM   #10
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everything i own is so complicated lol
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Old December 4th, 2008, 06:52 AM   #11
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i thought the seal would have been in the diff with the drivers seal, i never had a problem with it leaking so all i ever did was change the fluid. i know its a stock tj shaft......i bought the axle from a guy on here just cant remember who it was 2-3 years ago.
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Old December 4th, 2008, 11:06 AM   #12
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everything i own is so complicated lol
this is why I was in no hurry to come over and help you. I knew it wasn't going to be that simple
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Old December 4th, 2008, 12:48 PM   #13
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this is why I was in no hurry to come over and help you. I knew it wasn't going to be that simple
i hate you
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Old December 4th, 2008, 01:45 PM   #14
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the part wont be in until saturday. sad panda
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Old December 4th, 2008, 02:07 PM   #15
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everything i own is so complicated lol
i got you beat, my front axle has to use import cam seals for inner axle seals, but then again i have a dana 52 front axle
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Old December 4th, 2008, 02:09 PM   #16
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For future reference, the following axle seals will work in YJ disconnect housing with a TJ shaft in place of the original shaft:

Napa CN11771
Mazza's 40576S
National - 7757
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Old December 4th, 2008, 11:23 PM   #17
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yayy it's fixed. thanks again kelly
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Old December 5th, 2008, 01:28 AM   #18
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did you give him a wrister?
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Old December 8th, 2008, 08:34 AM   #19
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did that
I have done this too. it's great for laughs
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