Question about 1989 Buick LeSabre

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All of a sudden the transmission won't change gears. If I drive it in low it works but is slow. I can't drive on the highway and am not driving very much with this problem.(I'm afraid I will break it!) I checked the transmission fluid and it is OK. Someone told me it could be a modulator valve. Where is that located?? Should I try to fix that or should I get a diagnostic from a transmission place?

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More than likely you have a clogged filter, a vacuum leak or it could be a modulator but not likely. You would be best served having a transmission place check into it, but be careful as to not be sold a bill of goods. Some places will try to sell you a complete rebuild or tell you that the gears or clutches are fried. If this is the case, you should ask to see the trans pan fluid and insect it for metal pieces or a cork looking material.

Posted on May 25, 2011

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