I took the vent off and the dryer ran and did not trip the breaker.
That's odd. I have never run into a problem like that.
Sounds like a simple vent installed.
If the dryer itself is not plugged with lint build up around the blower housing and the breaker is ok then I would have to say it's something with the venting.
When the dryer is connected to the vent can you feel it blowing outside?