This is a transmission rebuild kit for the Chevy 5 speed NV4500 "MT8" transmission for 1990-1995. BK308WS You can identify this transmission in a Chevy by the cast "C-16812" or "C-18157". This transmission has an iron case with an aluminum top cover! This transmission usually comes in the 1990-95 Chevy 3/4 ton or 1 ton gas and diesel trucks. This kit includes all new bearings, seals, and gaskets & high quality lined OEM synchros rings. PLEASE NOTE: This transmission uses a 3 piece 1st and 2nd gear synchro rings. The outer rings and the inner rings are NOT included in this kit. This kit only includes the middle fiber lined 1st and 2nd gear rings because they are the only pieces that wear. We do stock the inner and outer synchro rings, so just let us know if you need them and we can add them to your order for just the cost of the rings if sent with your kit.