Question about 1999 Porsche Boxster

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I have a 99 boxter with 72k miles that needed a transmission. after i put a used one in the car drove good as long i stay under 60mph if i try to go faster it stay in the same gear the tiptronic drive great. does anyone have an idea what might be causing the problem?

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The problem could be too low oil level inside Torque Converter, poor quality of oil, or sliping interior clutch of automatic gearbox!
First check up the oil level inside automatic gearbox. Anyway you can change the automatic gearbox oil. Could be poor quality old oil from many years inside!
CAUTION: Too much or too little Automatic Transmission Fluid will affect the operation of the transmission. The ATF level must be checked at regular intervals.

Posted on Jan 02, 2010


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are there any codes? have you check the fluid level? what type of transmission fluid did you put in?

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