With these impressive new traction-control systems come new problems to deal with when lifting a vehicle. Our 2-inch Daystar boost didn't send Shortie into fits, but Biggie's 4-inch Superlift kit made Biggie's ESP and traction-control systems go a bit haywire even when taking a mild right turn at an intersection. AEV Conversions has created a Geometry Correction Module (GCM) to address the issues. The Jeep's traction-control system with Quadra Drive works by using internal differential fluid pressure to stop the spinning wheel, while the ESP system will cut engine power and apply appropriate brakes if it feels the vehicle is in danger of losing control. AEV's GCM goes inline on the wiring harness, inside the steering column.