How are the motor and the plastic impeller separated? The motor is mounted to the inside floor of the dryer, and the impeller is attached to a shaft through the case to the back of the machine.
Here are your parts
Replacement parts for WHIRLPOOL TEDS780JQ0 | AppliancePartsPros.com
Here is a good link, take a look at #13
http://www.applianceaid.com/whirlpool-dryers.html