Agitates but wont spin

You will probably find this useful, particularly sections 2 and 7.

https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/ec2a315861edab6e8525729c005736f0/$FILE/Maytag_Atlantis_III.pdf

Note how one motor is used to produce the agitation when it rotates in one direction and the spin when it rotates in the other. The manual describes how the motor spin is transferred through the transmission and other elements. You need to consider each step from whether the motor is spinning to whether the tub is turning and see where the motion is being lost. The motor itself is probably just fine since it produces agitation. Something is probably either jammed (if the motor isn't turning) or disconnected (if it is) when it should be spinning.