ST Racking rear lock-outs, as more and more Wheely King owners convert their truck to a rock crawler, one of the most requested parts has been a rear lock-out for the Wheely King. Similar in style to our Axial AX10 rear lock-out design, the Wheely King lock-outs features machined aluminum rear lock-outs with cut outs for weight reduction, and includes a set of stainless steel driveshafts.