NV4500 - Synchro Ring Kit (with reverse synchro)   Vital Parts is offering this NEW Synchro Ring Kit  GMC trucks equipped with NV4500 transmissions 1999 - 2007 5-spd applications with Internal Clutch Slave Please see the detailed description below for your specific model. As always if you are unsure of specific fitment please send us a message and we would be happy to help!  GMC - 1500 / 2500 / 3500 Sierra Trucks: 6 CYL 4.3L 1999 - 2007 - 5spd, RWD or 4WD, NV4500 - (Iron case, aluminum top, internal clutch slave, reverse synchro) 8 CYL 6.5L 1999 - 2002 - 5spd, RWD or 4WD, NV4500 - (Iron case, aluminum top, internal clutch slave, reverse synchro) 8 CYL 6.0L 1999 - 2007 - 5spd, RWD or 4WD, NV4500 - (Iron case, aluminum top) GMC - StepVan: 8 CYL 7.4L 1999 - 2000 - 5spd, RWD or 4WD, NV4500 - (Iron case, aluminum top, internal clutch slave, reverse synchro ring)