1. Our factory push-pull steering box is replaced with a 2WD steering box that has been rebuilt and upgraded by PSC. Our new box also has –AN ports to feed our ram-assist. It bolts to the frame using the factory holes and hardware. Be sure to check the frame closely for cracks in this area. The ’73-’87 GM square body 4x4 (up to 1991 for Blazer, Jimmy, Suburban and 1-ton) steering box mounts are notorious for cracking under the stress of larger tires. ORD offers a weld-on repair/gusset kit if your frame is damaged.