Throughout its production run, engine choices included the AEC-based TL12, a straight carry over from the preceding "stopgap" model Marathon range, The Rolls-Royce Eagle 265/300 and the Cummins 290 L10 and 14-litre 350 coupled to a Spicer or Eaton transmission, although all versions produced a distinctive whine from the propshaft knuckle joint when approaching 60 mph .