Problem At 40mph 1500rpm Options

[laz]

Hi all,


I've an 01 Galant and I'm trying to find out what's wrong with it. I hope you guys can give me some advice.

When I accelerate slowly around 40mph at 1500rpm the car starts to shake and then after 2 seconds it's back to normal.

It's like the car having a hard time to shift up one gear or something like that.

If I accelerate fast like going up to the highway it works fine.

Is that mean my transmission is going south or some electronic gone bad?

I'm not a mechanic but I read somewhere that around 40mph when the O/D kicks in?

Any help would be appreciated.


thanks

Laz