The speed change voltages are selected by the timer contacts. Try rotating your timer clockwise rapidly through several revolutions then select a delicate spin cycle and see if the speed is still too fast. If it is then the most likely suspect is the timer itself.
http://www.appliancepartspros.com/part_details.aspx?part_id=2045983
Model number used: WSM2780WAWWW
The timers are the same.
Thanks for using FixYa.
Kelly
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