NP246 GM/Chevy Transfer Case Half Rebuild Kit 1988-ON BK351/30603/HV072/BRNY/16217 This transfer case is aluminum and chain driven with an electric shift. This kit includes: New Rear Case half, Clutches, Case saver plate, Pump, Filter, Bearing kit, and Chain We upgrade your case from the factory OEM magnesium case that fails to a tougher aluminum design with reinforced edges where the pump rides, we also provide you with the case saver plate that prevents that pump from becoming an issue. Lastly you get the high quality Borgwarner Morse Chain; There is no Substitute Morse is what you want in your transfer case. Note: If you prefer the Magnesium case OEM design I can swap the aluminum one out no problem. Some people prefer Magnesium but the majority of our Transmission shops only want the Aluminum design. Will be glad to accommodate your needs!