Dryer would squeal when drying clothes

Unplugged dryer, turned off gas, raised front of dryer with two 2X4's on edge resting on legs, removed two lower panel screws, removed lower panel. Removed lower blower & filter assembly, screws (3) are on the inside of drum. (Good chance to clean it out) Removed two lower front upper main panel screws. Supported top panel with wood for access. Removed panel slowly, marked wires that go to door switch, set panel aside. Removed tension on belt by reaching in on the right lower side and unhooking the tensioner from belt, look to see how it is installed, for reinstallation on assembly. Pulled drum out slowly as not to damage seals on drum. replaced parts, attached with self tapping screws.(screws all the same size) reassembly in reverse order. Will need to put belt on drum before installing drum. Check drum alignment with rollers and seals. Used very small amount of high pressure grease on roller bracket and shaft assembly where the support roller shaft spins for lubrication. All's quiet. (Vacuumed out inside while dissassembled)