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my 08 impala with the 3.9 L is a fantastic car, but at about 100k, transmission started slamming during shifts. GM dealer could not find problem and no codes showing. I took it to a shop that has contracts with several police depts. for transmissions. I described the problem, he said valve body. $2100 repair and worked fine. Now at 124k, transmission seems like it is slipping, and at low speeds with very little throttle, I can feel shudder. Would be nice if GM had good transmissions. I have had almost all GMs since 1960's and almost all have had transmission problems at under 100k, but engines have lasted into high 300k miles. but the few Fords I had had good transmissions but the engines did not last (last owned a Ford in 1995). This year bought my wife a Nissan Versa Sedan with CVT, transmission code at 52k, replace whole transmission under warranty with no questions, problems or hassles. Maybe I need to start looking at other than GMs.
Besides the Transmission problems, both front hubs have been replaced, the left one twice for bearings and the right for bad ABS/Traction Wheel Sensor and the Rack & Pinion has been replaced. I have done most of my repairs on past cars/trucks myself and every vehicle I have had has made it well past 300k on the engines, but the rest of the quality on this Impala is going down hill.
I just happen across this post while trying to troubleshoot why my computer control system(tells me about my oil life, tire pressure, etc.) is not working. I have a 2004 Impala and I about fell out of my chair reading some of these posts. This sounds just like the stories that I have been telling my mechanic for months. He tells me he can't figure it out w/o codes, so the next time my car died while I was going 65 mph, I had AutoZone print the codes read before the check engine light went off. Still no luck fixing it though. The trans(was replaced w/ a rebuild) problem jerking when I take off, car not starting and then just mysteriously starting, electrical system malfunctioning. When I first noticed a problem the car's RPMs would fluctuate and sometimes the gas would control itself. My mechanic replaced the throttle body and MAF sensor and it seemed to work perfectly. However it did not fix the other issues. The check engine light still comes on and will go off after I shut off the car and sometimes a couple of days later.
I am very disappointed hearing that so many people are having the same problem with their Impala. In the past I had faith in General Motors.
I will be contacting them and will repost.
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