Belltech bolt-in C-section kit for 1988–2000 GM C-3500 frames uses a wrap-around, frame-capturing design to increase rear suspension travel and strengthen the rail for aggressively lowered vehicles. The DIY-friendly kit includes a notch template, Grade 8 hardware, progressive-rate polymer bump stops and typically adds about 2" of compression travel while requiring frame modification for installation.
Belltech C-SECTION KIT 88-00 GM C-3500