2000 Monte Carlo SS Tranny issue

[rtuskan]

Hey Folks!

Well, another problem has come up. Today on the drive to work I noticed my Monte didn't want to stay in Drive (D), and it automatically dropped to 3rd. I didn't think much of it at the time...

On the way home, however, I was paying close attention to it. I drive mainly highway to and from work - average speed of 75 (posted is 70). I noticed that when I completely took my foot off the accelerator, it would drop into "Drive". But the moment I touched the gas, it would immediately go back into 3rd. When I got on some back roads I played with it again....same results. At one point, I did manage to get it to "chug" while in "Drive".

Any suggestions on this one???

[wafrederick]

Is the sevice engine light on?,the computer is seeing something wrong and the transmission is computer controled.Get it scanned for codes and go there first.The next trip is to a transmission shop.

[rtuskan]

Yep, had the engine light but as suspected it was for an 02 sensor (rear sensor is not in the car). Other than that, nothing...