I did the 2-bucket method today to change the transmission fluid. It was blacker than the ace of spades, it took 4.5 gallons of ATF before the fluid coming out of the cooler line was red. The DeVille has 140,000 miles on it now. I got the fluid level just perfect, and took it for a test drive. It shifted well through every gear, and the 1-2 shift was quick and firm, unlike the soft and slow shift it's been for a few weeks now. I went drove back and had dinner. A few hours later when I left, the transmission began shifting goofy. The 1-2 shift was great, but the 2-3 shift felt slow.
Once in 3rd, the car would accelerate very slowly, but the engine would rev. I was able to get on the highway, where I set the cruise at 60. After about 5 minutes, the cruise light went off, the engine revved to all high-hell, and I got a code E66.Eventually 3rd gear was slipping completly, same with 4th. I was able to coast to a gas station. The fluid looks great, the level is perfect, and it does not smell bad at all (probably because it's brand new). I limped it home in 2nd gear. By the time I got home, 2nd gear was slipping too, and it will not shift into 3 or 4th any more. First gear is still solid.
I hate to assume the worst, but I'm afraid I have to. Any thoughts?
Brian
Once in 3rd, the car would accelerate very slowly, but the engine would rev. I was able to get on the highway, where I set the cruise at 60. After about 5 minutes, the cruise light went off, the engine revved to all high-hell, and I got a code E66.Eventually 3rd gear was slipping completly, same with 4th. I was able to coast to a gas station. The fluid looks great, the level is perfect, and it does not smell bad at all (probably because it's brand new). I limped it home in 2nd gear. By the time I got home, 2nd gear was slipping too, and it will not shift into 3 or 4th any more. First gear is still solid.
I hate to assume the worst, but I'm afraid I have to. Any thoughts?
Brian