unusually loud rumbling in spin mode, no spin out

removed outer enclosure to expose inside workings. removed all retaining springs to tub and transmission housing. Inverted tub to access agitator pulley and belt. Removed pulley and cut belt off.(I knew I was replacing it, anyway.)Had to remove large tub bracket to exchange new pulley for old. Disconnect bleach reservoir filler tubing on tub assembly. Disconnect power connector to drive motor. Removed water pump to access drive pulley where new belt belongs. Aligned belt to pulleys and checked idler pulley tension which was acceptable. Replace helix drive lug against spin/agitator and tightened retaining bolt. Assembled components in reverse order and conducted test run. Success. Smooth running machine and saved about $200 on professional labor costs. I had no repair manual but you should have a personal confidence in general repair work. Something like a history of taking things apart and putting them back together successfully. I had an independent appliance repair guy examine the washer and he said it was too complicated for him. Once I had it apart, it seemed fairly basic. Good luck!