Shane S Athol , ID April 20, 2018 Appliance: KitchenAid 6 Qt. Stand Mixer KP26M1XPM4 Kitchenaid Mixer Kp26m1xpm4: Worm gear stripped. How to replace Transmission Housing. Replaced all the gears due to stripped worm gear and metal contamination in the grease, repair was easy, mixer works just like new again, it lasted 12 years Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes