My transmission is shifting hard after it heats up. The "presure cylinder in side the transmission may be acting up and needs replacement" is what one mechanic said and quoted me a $500 repair. It doesn't always shift hard and most of the time it shifts normally. this has been a problem since I bought the car in 2004. The light went on this summer that indicated a problem, but when they shut it off, it did not come back on. Since I have over 170,000 miles on this transmission, I wonder if I should fix it for $500 or just drive it until it gets worse and the light comes on again?
Will fixing it help my transmission to last longer, or with that much mileage, will I need to replace anyway in the near future and waste the 500 expense?