transmision trouble

I have a 2000 Dakota. yesterday i was driving on the hwy. cruise control set at 60. when all of a sudden i lost all forward gears. i still have reverse but it does whine a little when in reverse. im left with nothing in all forward gears except a whining sound..
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All the lights intermittently flash off for a split second and come again every time a relay comes on. Anyone know the fix.