Back Half Frame Kit for Jeep YJ

The Motobilt Jeep YJ Back Half Kit replaces the rear portion of the factory frame and creates the space needed for modern suspension setups and aggressive off-road builds.

Originally developed when Dan DuBose back-halved his own YJ more than 15 years ago, the design has evolved into a precision laser-cut and formed system built to simplify what was once a complex fabrication process. 

One of the biggest advantages of the back half design is the relocation of the frame rails. Instead of running through the rear wheel well like the factory frame, the rails are moved under the rear floor. This creates significantly more room for coilover shock placement and suspension tuning, allowing builders to properly set shock angles and suspension geometry without the frame getting in the way. 

The design also improves rear ground clearance. By moving the bumper location higher and tightening the rear structure, the kit gains roughly 7 inches of clearance in the rear bumper area, dramatically improving the Jeep’s departure angle on steep obstacles. 

Constructed from 3/16 inch steel plate that is laser cut and CNC press brake formed, the system creates a strong rear structure that integrates a rear bumper directly into the frame design. The bumper includes 3/4 inch thick recovery points that tie into the frame rails for added strength. 

This kit is designed for serious off-road builds where the factory rear frame layout becomes a limitation when running large tires, long-travel suspension, or custom rear axle setups.