Question about 1992 Mercury Topaz

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Short shifting the car was fine just down shifting a little bit rough. put a little bit of lucas transmission treatment in it and it got ROUGH period. it tries to shift when it gets to 20 grad rpms. then it instantly down shifts. it does not do it all the time just after it gets warmed up. does any one know what could cause this to happen??

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  • Mercury Master
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Put a manual gearbox in it

Posted on Jan 10, 2009

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1 Answer

Shifts hard after driving a while


I am assuming you have high mileage and it is probably starting to wear out and will need a rebuild soon. You can take it to any auto parts store to get a computer reading and see if a transmission code got thrown up to the computer. Occasionally a relay will go bad in the transmission but if you're around 200,000 +/- 50K then you are in the possible realm of rebuild. Especially if you didn't flush your transmission fluid every 75k miles. You can use a siphon pump and pump out a quart of oil and put a quart of Lucas transmission oil to buy you some time and smooth out that hard shift a little bit(This is assuming its not completely shot yet). I had a chevy truck that had the 4l60e transmission, I could tell it shifted a little rough but couldn't do a flush because I could tell there was too much fiber in the fluid and the transmission would go if I flushed it. I put Lucas in it then at 170k, smoothed out the hard shifting significantly and I finally rebuilt the transmission at 230k. Its not a miracle in a bottle but if you catch the issue early, it can give you some extra mileage out of it like my extra 50K.

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Hi, I checked the transmission fluid level.  It is a bit high.  Read an article on web, it says high trans fluid level may cause transmission malfunction.  My technician took some fluid out to lower the level.  Not sure it will fix the problem yet.  Will let you know.
Do you think high trans fluid level may cause the problem I experienced?
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