I've got a Sebring Convertible with the 2.7 V6 and 4 speed Automatic transmission. Its closing in on 130,000 miles. I know there are horror stories about this engine/transmission combo but this has been a reliable car with no oil sludge. My question here is that when the car is cold, when it shifts into drive it comes with a very abrupt and hard shift. While driving it shifts very smooth into all forward gears and doesn't slip, when the car has warmed up, it seamlessly shifts into drive. The only issue I had was a quick lube did my 120K transmission flush and put Pennzoil universal ATF in my transmission, I drove it for about 700 miles and then noticed when I cleaned the glove box out they didn't put ATF4 in it, I took it back and they quickly put the right fluid in. I have noticed that when I unhook the battery over the winter, the transmission engages into drive smoothly for a while before getting abrupt. Any suggestions?