2018 Allison 3000RDSP, School Bus, Transmission Assys, Fits to: Thomas Built Saf-T-Liner HDX, (Used) 2017 Allison (AT), TRANSMISSION ASSEMBLY- Model: 3000PTS, Serial Number: 6511484993, Engine: Cummins ISL G, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921, Serial# 6511484993, Casting# 6511484993, Truck Year 2018 1T7Y34F2XJ1133759