The high resolution infrared emission spectrum of aluminum monochloride has been recorded with a Fourier transform spectrometer. A total of 1747 rovibrational transitions, v=1→0 to v=8→7, for the most abundant isotopomer 27Al35Cl and 708, v=1→0 to v=4→3, for the least abundant isotopomer 27Al37Cl have been assigned. This new set of infrared data was combined with existing microwave and millimeter-wave data to refine the Dunham Yij constants for the X 1Σ+ electronic ground state. In addition two sets of mass-reduced Dunham Uij constants have been determined from separate fits. In the first fit all of the Uij constants that could be statistically determined were treated as adjustable parameters. In the second fit only the constants satisfying the condition j<2 were treated as adjustable parameters while the values for the remaining constants were fixed to constraints imposed by the Dunham model. Finally, in order to fully utilize the information provided by this extensive data set in an attempt to improve the prediction of energies for higher lying v, J levels of the X 1Σ+ state, the combined data set, consisting of microwave, millimeter, and infrared (IR) data were fitted directly to the eigenvalues of the Schrödinger equation containing a parametrized internuclear potential energy function.