1999 GMC GMC VAN - Transmission, Transaxle Automatic Transmission, 4L80E Opt MT1, 4.3L, Without Opt ZK3, 60 Months Warranty. Free Shipping, 1 Month Return Policy. Used (Original Equipment Manufacturer). Transmission Tested and Run, covered by warranty. All Transmissions are Shipped as Complete Assemblies including: Transmission; Torque Converter (Automatic Transmissions Only); Oil Pan.