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Re: Automatic Transmission Issue - 1989 9000 1 Saabers Like This Post!
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Posted by JerseySaab [Email] (#666) [Profile/Gallery] (more from JerseySaab) on Mon, 28 Apr 2025 15:58:49 Share Post by Email
In Reply to: Automatic Transmission Issue - 1989 9000, oregonsaab [Profile/Gallery] , Sun, 27 Apr 2025 21:56:32
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Possibly your governor seals are failing. The usual symptom is erratic automatic shifting but manual shifting works OK. I had this happen years ago on my '97 9000. Replacing the seals was not too difficult, an afternoon's wrenching. However at that time Eriksson Industries was still providing parts for these transmissions. I don't think that's the case any more. (They are square-shouldered rubber seals, not o-rings.)

These videos show pulling out the governor in a Citroen that uses the same transmission:

https://www.youtube.com/watch?v=ti03JmyBl1o

https://www.youtube.com/watch?v=gbXsGNf03ls

https://www.youtube.com/watch?v=FNFz0Ucj_wo

Although it was apparently popular in Europe the ZF 4HP18 transmission is almost unknown in the U.S., only having been used in the Saab 9000 and a few other even lower-volume cars.

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