A method of and tool for positionally aligning a gearbox of a gas turbine engine is provided. The method includes: providing an alignment tool that includes a plurality of probe pins and a support flange; attaching the alignment tool to an engine case of the gas turbine engine; engaging the gearbox with the engine case; positionally aligning the gearbox by contacting a first surface of the gearbox with a first probe pin of the plurality of probe pins, and contacting a second surface of the gearbox with a second probe pin of the plurality of probe pins; and securing the gearbox to the engine case while the first probe pin is in contact with the first surface of the gearbox and the second probe pin is in contact with the second surface of the gearbox.