Learn how your appliance is supposed to operate so you can determine if it is malfunctioning.
The transmission gearcase provides the back and forth action of the agitator shaft for the wash cycle, spins the basket during the spin cycle and is supposed to do nothing during the pumpout cycle. If the gearcase is not performing its functions or is making strange noises, it may have to be replaced.
The first thing to do is to determine if the transmission is still in warranty. If your machine is less than 5-years old, check your owner's manual for warranty coverage. Many washers sold before 2006 have a 5-year part warranty on the transmission. If it is needed and within the warranty period, you should call for warranty service to have the transmission replaced under the warranty. BTW The warranty usually covers the part only and you will likely be responsible for the service charge and labor to perform the work.
Use your model number to order a new gearcase if your old one is out of warranty.
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All of the information in these Appliance Clinic procedures is provided FREE OF CHARGE. No liability is assumed by the author for the accuracy of the contents or damages caused by the use of these procedures.