2003 Allison Other, Truck Delivery, Transmission Assys, Fits to: GMC C8500, ( used ) 2002 Allison (AT) TRANSMISSION ASSEMBLY- Engine: Caterpillar 3126 Model: N/A Serial: N/A For more information about this item. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 921, W PULASKI HWY ELKTON, MD 21921, Serial# Other, Casting# Other, Truck Year 2003 1GDP8E1CX3F520491