squeeling noise & drum turning real slow

unplug appliance.removed 2 screws @ the rear of dryer top to tip lid back. unplugged the door switch wires.took out 3 philip screws that hold lint screen to inside of drum.removed 2 screws @ dryer front top. lifted dryer front panel off. the drum was now loose. slipped off old belt - replaced with new. set drum back into place. made sure new belt was on motor pulley & behind tensioner pulley arm. replace & reconnect items in reverse order. plug back in & test. after seeing the wear on the plastic tensioner pulley i regret not ordering that part for replacement also.