GM/Chevy NV4500 4WD 1996-ON Deluxe Rebuild Kit This kit includes an updated mainshaft, Complete Bearing and seal kit, 19 Tooth 5th gear, updated 5th gear nut kit and all the spring and keys for the Chevy 4x4 NV4500 transmission. This will not work for a 2WD vehicle! Note: This kit includes the 19 Tooth 5th gear the GM NV4500 came with two different tooth counts; either the 19 tooth or the 22 tooth; be sure to count your teeth prior to ordering if you need the 22 Tooth please see our other listing. If you need the 2wd mainshaft please ask they are available but there are some differences to discuss. 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 1996-ON Chevy 3/4 ton or 1 ton gas and diesel trucks. This kit includes all new high quality bearings, seals, gaskets, high quality lined OEM synchro rings, an updated mainshaft, updated 5th gear nut, a new mainshaft 5th gear and the spring and keys. 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.