Dryer had Loud squeek, barely spun!

First, I shut off the gas & unplugged the dryer. Then I disconnected the vent pipe so I could pull it away from the wall to access the back. Disassembling the dryer was simple.
there are 8 screws: 2 for rear access panel, 2 for top, & 4 for front panel! Once front panel is off, lift back of drum up 2 inches, then forward to get rear bearing out of it's bracket. My rear bearing had worn down so much it was 1/2 the size of the new one! It wore through the bracket down to the metal! I replaced the rear bearing & bracket assembly, as well as the belt & the spring for the belt tensioner! make sure you generously lubricate the new bearing as well as the tensioner pulley! The most time consuming part of this job was cleaning all the lint out the dryer cabinet& cleaning the drum. It works great now! I hope to get a few more years out of it!