Check this out if your KA mixer broke
The following was on amazon. the issue is not so much the metal gears, but the fact that the metal gears where held in the housing with plastic pins that eventually failed. See the following from KitchenAid and their willingness to stand by an out of warranty item that fails:
311 of 318 people found the following review helpful:
Product Info regarding gear housing upgrade from KitchenAid, October 7, 2006
|By||Living it up|
This review is from: KitchenAid KP26M1XPM Professional 600 Series 6-Quart Stand Mixer, Pearl Metallic (Kitchen)
Due to the very high number of complaints about the problems people were having with heavy duty tasks (which is what the mixer should have been made for!) due to cheap plastic housing holding the heavy duty metal gears, I contact KitchenAid to find out if this design flaw has been fixed. It has been and here is their response (note that they are saying that if you receive one of the models with the plastic housing they will replace it under warranty with the new metal housing. It is also important to note that the people who've had the problem have almost all stated that KitchenAid had great customer service and replaced their mixers with no ones with no problems.
RESPONSE FROM KITCHENAID: Thank you for visiting the KitchenAid website!
I would like to reassure you that our engineering and product teams have addressed the gear box issue. In fact, we have already implemented a change in the manufacturing of the Pro 600 Stand Mixers to a metal gear box. Although these will be changed out on additional 5 qt bowl-lift models that include all metal gearing, the time line on that is not known at this time. Although a transparent change, this will insure the long-term durability we expect.
I would like to emphasize to you that should you purchase a Stand Mixer (with all metal gearing) which has not been assembled with the upgraded metal gear box, and you should have a problem with your mixer (as a result of the plastic gear box (failure), we will most certainly extend your warranty to resolve the issue properly and effectively.
If you have additional questions, feel free to reply back to me. Or, you may contact either our KitchenAid Customer Satisfaction Center at 1-800-541-6390, or you may visit our secure KitchenAid Live Chat.