Aluminum rear-front 1-piece suspension holder was redesigned to allow mounting of the rear bulkheads into the holder for improved flex of the rear suspension. The 1-piece holder is inserted into the chassis for a better centering. The rear arm mounts were redesigned to use the square composite bushings from the T4 and XB4 cars. The square eccentric bushings retain the vertical adjustment of the inner hinge pins from the previous NT1s, but add the ability to adjust the pin width to expand the roll center and geometry adjustments available for the rear suspension. The holders are also narrower which allows to mount the arms more closer together to generate more traction
