problems with transmission will not shift right.

What is your question?

Every time i am driving there is a clicking noise coming fromrear end, only when driving a certain mile per hour. There is a problem with the transmission shifting as well. The check engine light is on saying no oil. but i have checked and there is oil in the car. why is it saying there is no oil? I have been driving it for at least 6months this way but feel it will not last much longer