A method of marrying a rear axle assembly to a vehicle body is provided. The axle assembly includes parallel-spaced trailing control arms connected together by a transverse twist beam. The trailing control arms have a sleeve at a forward end and a spindle plate adjacent a rear end. The spindle plate along its lower end having V-shaped notches which are vertically and fore and aft aligned with one another. The axle assembly is connected with a tool tray, having two fore and aft aligned and vertically aligned elevated first and second pins projecting toward one another and third and fourth pins for contacting said trailing control arm sleeves to set the vertical height of the forward end of the trailing control arms. The axle assembly is set on the tray by placing the spindle plate V-shaped notches on the first and second pins to set the axle assembly fore and aft position and rear end vertical position with respect to the tray. The sleeves of the trailing control arms are set on the third and fourth pins to set the height of the fore end of the trailing control arms. The tool tray is lifted up to the vehicle body and the axle assembly is connected to the vehicle body.