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  #1  
Old 06-17-2004, 12:37 AM
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Default TH400 shifter shaft seal

Now that you guys don't like the clutch bell crank I liberated [img]images/graemlins/crybaby.gif[/img](JK)

I was checking how well the new motor mounts were leveling things out when............
I got a big drop of ATF right in my ear [img]images/graemlins/censor.gif[/img]

How do you replace the seal on the manual shift shaft?
Apparently it's inside, caus I can't see it on the outside [img]images/graemlins/grin.gif[/img]

I think I need to remove the shift shaft and get the seal from inside the pan, but my memory is getting bad from [img]images/graemlins/40BEER.gif[/img]


BTW the tranny mount is still tipped a little, but the engine is level again.
Thom
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Old 06-17-2004, 07:01 AM
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Default Re: TH400 shifter shaft seal

You should be able to replace it without taking the pan off. I've done "a few" in my day. The only time I ever removed the pan to replace the seal was if the shaft is was bad. The hardest part is probably removing the seal itself. When re-installing the shaft has to be super clean and well lubed. There is a special tool for installing the seal but I always used a deep socket the same diameter as the seal, I believe it was a 3/8 drive thin wall 9/16 th. If there is a groove worn into the shaft were the seal lip seals your probably going to be better off replacing the shaft anyway.
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Old 06-17-2004, 09:10 AM
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Default Re: TH400 shifter shaft seal

Dennis,
I pulled the lever off the shaft. It sure doesn't look like there is a lip seal [img]images/graemlins/confused.gif[/img] It looks like the shaft just goes thru the aluminum case.
The TSM shows a nice lip seal, but I'm confused, why can't I see it?
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Old 06-17-2004, 12:09 PM
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Default Re: TH400 shifter shaft seal

Maybe it's gone or someone (PO? if not you) rammed it in too far. It should be very noticeable. If I can dig my spare tranny out this afternoon I'll post a picture of what it should look like.
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Old 06-17-2004, 12:17 PM
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Default Re: TH400 shifter shaft seal

I would think the lip seal would be steel. That's easy to find.
But the boss where the shaft comes thru is ALL ALUMINUM [img]images/graemlins/confused.gif[/img] there isn't a c-bore or anything?
That's why I'm so confused.
I'll post a pic tonight.
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Old 06-17-2004, 03:02 PM
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Default Re: TH400 shifter shaft seal

I couldn't get at my spare tranny, too much [img]images/graemlins/censor.gif[/img] in the way. I did take a seal out of one of my rebuild kits. Don't let me forget to put that back. [img]images/graemlins/grin.gif[/img]
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Old 06-17-2004, 05:13 PM
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Default Re: TH400 shifter shaft seal

It is on the drivers side,correct?I replaced mine when I first got it and I had the same problem,could not see where the seal and the case meet!There is a seal in there,I droped my pan,cant remember if it helped or not.That was 2 years ago on my 72.Good luck
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Old 06-17-2004, 06:12 PM
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Default Re: TH400 shifter shaft seal

Guys, Thanks for the help.
Here's a pic of the shift shaft (Yea it's the right one, I pulled the cable off it [img]images/graemlins/bs.gif[/img])

It's all aluminum all the way to the shaft. I dug at it with a small screwdriver.
The seal has a steel housing right?
What do you think now, tough guys?
JK [img]images/graemlins/grin.gif[/img] Thom
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Old 06-17-2004, 08:03 PM
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Default Re: TH400 shifter shaft seal

I'm seeing the vauge outline of the seal in that picture. Looks like the shift lever has been rubbing on the case cause if my memory serves me well there should be a slight chamfer were the seal goes into the housing. That little white spot on the picture just below the shaft and to the right of center is real close to the edge of the seal. Yes the seal does have a steel housing. I'm going to e-mail that picture to myself and see if I can mark on the picture were the edge of the seal is. It might take me a bit but I'll repost when I get it done.
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Old 06-17-2004, 08:17 PM
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Default Re: TH400 shifter shaft seal

Could you e-mail me that picture? I can't open it with any of my photo programs.

gotthewillys@aol.com
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