2007 Allison 3500RDSP, Truck Delivery, Transmission Assys, Fits to: Sterling LT8500, (Used) 2006 Allison (AT), TRANSMISSION ASSEMBLY- Model: 3500RDSP, Serial Number: 6510666263, Engine: Caterpillar C7, 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# 6510666263, Casting# 6510666263, Truck Year 2007 2FZAAWDC47AX55355