Sure, if the vehicle speed is below 40-50 mph,Technically, it could also be 1st gear, no?
Sounds like you have a vacuum leak somewhere.And easier if you have the traditional shift pattern and not have to go up with the shifter instead of down to get there. I have trouble with thinking in reverse lol Mine isn't right I'm sure or it hates me. It'll kick down when I'm not wanting it to, getting on it real quick to catch up with a friend or something and if wanting it to other wise it's decides if it will or not. But then I don't think anything is adjusted correctly on the car. Several years ago Psig and FEandGoingBroke adjusted the carb, timing and all kinds of things and the car ran better and had more power than it had in years...until i got about 20 miles down the road on a little hill and it sputtered and snorted and went right back to how it had been. Points changes it did same, new points, test drive, snort and cough, sometimes die, start it back up and it was fine for the next 2 or 3 yrs when i thought i should change the points again. I think it's been with me too many years and hates change as I do! LOL