[Nagakilo]

So last weekend I seafoamed my car. It had 50,000 miles on it. I seafoamed it friday morning, put about 50 miles on the car, and then changed the oil saturday afternoon. Well the past two days (Tuesday and Thursday) I've noticed the car feeling like it's hanging gears. That being said, it is an automatic. Like I'm at 2,000 rpm's and doing 70 mph and it feels like the cars pushing like I'm accelerating even though I'm just maintaining speed. I did watch the speedometer closely to insure that it wasn't human error, I'm not just holding down the gas pedal stupidly. It's almost like the car wants to shift, but it doesn't.

While on the highway I accelerated to about 80 and it didn't shift, but the pushing feeling got worse. I intentionally didn't hit it hard enough to make it shift down though. Should I be worried, or is this actually how a mustang is supposed to feel and seafoam just kicks that much butt.

[mustang1010]

You should pull the codes and post what ya find out. it may just be a bad sensor.

[Nagakilo]

I don't have any lights on though, so wouldn't there not be any codes?

[Markstang690]

so are you saying its just not shifting into overdrive(4th gear)?