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I recently had to get the autobox from another car rebuilt. Whilst emptying my wallet at the gearbox specialists, I discussed the terms of the warranty and was told that if the fluid was changed, a certain additive had to be used or the warranty was invalid. After further discussion about the additive and its uses, I asked about Saab gearboxes, and the chap said "Ah, we've got a service bulletin from Saab" and duly gave me a copy.

The additive is called "Lubegard" and is made by International Lubricants Inc of Seattle, USA.

The Saab bulletin (Parts & Service Information) is: Category: transmission, Section: 4, Page: 14, Issue: 06/93-0352, Code 442. It states "Some complaints have been received from owners of 9000 cars equiped with the ZF 4HP18 automatic transmission of a noise that occurs at the 2 - 3 upshift point. The noise may be described as a "squawk" or "moan" that usually occurs under light throttle pressure. A transmission fluid additive has been tested and approved for use as a service solution to address these complaints." etc etc etc

I'm not normally a big fan of additives, but as Saab recommend it and the gearbox experts insist on it, I thought it might be worth passing the info on.

If you can't get it locally, contact

Three D Transmissions
Unit 3A
Great Knolly St
Reading
RG1 7HN

0118 957 3104

You must of course make sure your gearbox fluid is in good condition, preferably new, before adding the Lubegard.
 
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