Took 05 Bonne on trip to Rockies, performed great while on open road, shifted fine into and out of overdrive while ascending and descending mountains. I knew about this car doing hard shifts in the lower gears especially when fluids warm and coasting say down to 5-15 mph and then suddenly accelerating. This was already happening 4k miles back. Arrived in Denver, got stuck in rush hour, and issues with hard shifting began. Every time I slowed down to less than 15 mph and then accelerated, it felt like some vehicle had tapped the rear of my car. It was quite unnerving because I was afraid the tranny would fail right on the Denver freeway.

I've had a 2000 Bonne where the tranny suddenly died and it would cost $2k to fix, so if this car's tranny died I would have left the car there and done a rental car. Anyhow, I proceeded on to Wyoming and went through five mountain passes with no problems, I'm assuming, because the mountain air is cooler plus I wasn't in stop and go traffic, except for Yellowstone Park, where in stop and go traffic it began shifting hard in the lower gears. So for the rest of my trip I avoided city driving and tranny performed fine, But every time I got caught in heavy traffic and the fluids were warm from the driving during the day, the hard shifting reoccurred.