Back Half Kits | Rear Frames for drag racing and performance street cars & trucks. Our 2×3 and round tube car and truck welded rear frames are jig welded in-house, by our talented fabricators and welders. Most Pro 500, Pro Series and Direct Fit styles are available in a 4-Link or Ladder Bar configuration and with or without a full or partial suspension package. Unwelded LB & 4-Link 2×3 & RT kits are available for builders who prefer to start from scratch. Details can be found on Vol.35 catalog pages 14 to 20.