1. In a plow having a. a main frame, b. draft means attached to the frame for moving the frame over the ground, c. support means attached to the frame for i. supporting the frame in a desired position while plowing, and ii. lifting the frame above the ground for transportation, and d. plow means for working the earth; e. the improvement comprising: f. two subframes g. mounted to the frame for movement relative thereto, h. said plow means equally attached to the subframes, j. vibrating means interconnecting the subframes for moving them equally and opposite, k. each of said subframes attached to said main frame by parallel linkage so that they are freely movable laterally in a horizontal direction normal to the direction of draft, m. a pitman extending from the front of the main frame to the rear of each subframe, n. said main frame including i. two horizontal bars spaced one in front of the other with ii. cross bracing therebetween, o. each subframe including i. two horizontal bars spaced one in front of the other with ii. crossbracing therebetween, p. a pin mounted near each end of each horizontal bar of each subframe, q. a bearing mounted on the main frame above each pin on the subframe, r. a torque bar aligned with the direction of draft journaled in the two bearings on the main frame above the two pins at the ends of any pair of horizontal bars of the subframes, and s. crank arms attached to the ends of the torque bars t. journaled over the subframe pins.