Transmission sort of slipped. Started at light, hit the accelerator, car didn't move then all of a sudden grabbed and gave you whiplash. Took to Chevrolet dealer in Webster, NY several times, couldn't find problem. Finally got the car to do it and dealer couldn't figure out the problem so wanted to replace transmission @ $4000. Traded the car in.

The problem escalated from a little twitch once in awhile to full blown whiplash at every stoplight. The wife's 07 is starting to do the same, dealer said some of the transmission cases were porous.....hum.

The transmission seems to not go back to first when you stop, and then when you take off, it hesitates, and then you feel the front wheels slip and it drops into gear and then wants to take off fast. I have had 4 intermediate shafts on this replaced, the last was not covered by my extended warranty, they consider it a recall item, and won't pay for it to be fixed, so I had to pay over 400.00 for it. Then the rack went out, which was then replaced, and then they told me the transmission lines where leaking, and I had to pay to have those repaired, another 300.00. It seems these cars have some sort of transmission problem, shades of the 1980's "power steering syndrome" when the car was cold in the winter, you couldn't turn the steering wheel. I'm bringing it in next week for oil change, and to have this looked at, if they tell me they can't "make it do that" I'm going to trade it in, and never again buy Chevrolet. I've been very disappointed in the seemingly stupid irritating problems these cars have, which Chevrolet does not stand behind. I bought this car as a "rental return" in Oct of 2007, and it had 28,000 miles on it then, so, you can see how low mileage I've put on it over the years to have so many problems with the transmission, drive-train of this vehicle.

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The transmission on this car slips intermittently between first to second, and second to third.

It's most affected upon acceleration from a stop (working in Chicago, I'm on the gas and brakes for 3-4 hours a day). The car shudders, and then BANG as it shifts into second. (and same with second into third). This usually happens under light acceleration, for whatever reason, flooring it usually reduces it.

I've bought the car under GM's "Certified Used Car" program, so I was well within the warranty window at this point. I've brought it to the dealer that sold it to me (name held to prevent hilarious public ridicule). Each time of the three times, they told me they couldn't reproduce it.

One of these times, they had it for over a week... Well, I wrote down the odometer before and after and found they only drove 14 miles... I drive 110 a day for work alone, and it doesn't impact me all the time.

The last time I brought it there, I took the "Shop Foreman" for a ride to attempt to get it to slip. He explained it was too infrequent for them to find the problem, but he did tell me about countless other Impalas with "mystery transmission problems."

The other night, it was happening so bad that my girlfriend dropped her cellphone on the floor of the car from the hard jerking (lol) motion of the trans. I put it in neutral, coasted to a stop, then started it again, shifting through each of the gears while on the brake, about 10 seconds in each gear. Seemed to help -- for that night.

Still waiting for the trans to blow, and since I'm at 108,000 miles, I'm 8k out of the "certified warranty" scam. It's obvious they didn't even pop the hood, or this would have been sent to the hood (at auction).