1998 Caterpillar 3406, Truck Tractor, ECMs, Fits to: Western Star 4900, (Used) 1997 CATERPILLAR 3406 ECM- Horsepower: 475, Pins: 40/40, ESN: 6TS22200, 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# 6TS22200, Casting# 6TS22200, Truck Year 1998 2WKPDCCJ8WK951967