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Unread 08-29-2014, 03:16 PM   #1
jasonjones21
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1989 YJ Wrangler 
 
Join Date: May 2013
Location: fontana, ca
Posts: 233
Tf999 trans

Hy does my 3 speed auto tf999 trans leak when it's cold and not when my Yj is hot it's coming from the shifter linkage? No idea why

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Unread 08-30-2014, 05:30 AM   #2
superj
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1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,494
The seal needs to be replaced. Everything shrinks when its cold. When it heats up, it expands. Yours is just worn enough it leaks.


I think there is a seal there.
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Unread 08-30-2014, 05:56 AM   #3
jay-h
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1989 YJ Wrangler 
 
Join Date: Dec 2006
Location: , NJ
Posts: 4,401
That's a common leak point for those transmissions. I have been told you can replace that seal inside the vehicle by removing the valve body but other people have said that's not a good way to do it.

You can go on for a while, until it gets too messy. In my case, since I use it as a daily driver and occasional road trip vehicle, I decided to have it dropped and had it rebuilt all around (rather than waiting for it to fail). It cost a bit, but in those transmissions can last forever if you keep them up.
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Unread 08-30-2014, 10:41 AM   #4
superj
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Yup, very hardy transmissions. I never had a bit of trouble out of mine and it was behind a stroker
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