Purchase a set of steering axles for your monster truck but only need 2WS?  This bolt-in lockout kit eliminates the steering on your rear axle.  This kit comes with both lockout links and stainless mounting hardware as pictured.

Install these on top of the steering plates (as pictured below), and they will give you a slight toe-in for better high-speed stability.  Install them on the bottom of the plates, and the rear knuckles will be perfectly straight.