2003 Western Star 4900. 3406B , Yes converted from an ISX to a B model CAT. Engine was overhauled , see picture of paper work . 18 speed , Hendrickson HN walking beam , rear diff locker , AC equipped but not hooked up, some challenges with the engine swap, gauges ,switches etc. Logger front bumper with HD pull pin. 245" wheel base , 12'6" cab to trunion and cab to end of frame measures 21'6" , air and electrical to end of frame .