Earthmoving machine, and hopefully not the one driving it
DOZER [I think that fear is currently reserved for airplanes]G-and-T part
TONIC [note the hyphens]Rams' dams
Today's theme gives us pop song titles which describe the intitial pronoun of the title: I'M, SHE'S, WE'RE, HE'S. (I actually heard of three of the four.) Gareth even provides an Ipod CLASSIC to hear them, though I'll pass.