In 97 did the 'basic trip', down to Lakes, to Chiloe, to Coihaique, picked up 40 and on to Torres del Paine, and Punta Arenas, and Ushuaia. Came back 3, on the Argentina coast to Comodoro Rivadavia, Bariloche, and over Portillo pass alongside Aconqagua from Mendoza. Can honestly say Ruta 40 was the reward of the trip. We road it 2-up with no issues, on an Elefant (Ducati)! I also hear of constant paving, so soon that magical gravel road will be no more.