Prevent front driveline issues on your lifted 2013-2018 Ram 3500 4WD truck with the BDS transfer case indexing ring kit. At 6" of lift and above it is necessary to index the transfer case to allow the front driveline to reconnect and eliminate vibrations. Designed for 8-bolt flange transmissions, the BDS t-case index ring kit has optimal spline engagement and is dual-drilled to allow positioning for compatibility with a range of lift heights. Rounding out the 8-bolt indexing kit is a billet aluminum driveshaft spacer and all the hardware needed to complete the installation.