Bonjour,
J'ai trouve ceci hier en reponse a ma question (site: wikitravel)

.
C'est en anglais mais ca peut toujours aider!!
A quite remarkable trip is the bus connection between
El Calafate and
Bariloche
along Ruta 40. It is mainly operated for the benefit of tourists by the Agency
Chaltentravel
(directly only the Calafate-
Perito Moreno stage), since people of Calafate and
Bariloche have very small ties between each other, which does not sound strange after you have made the journey and seen the state of the road.
Views, if the weather is good, are in places stunning, especially between Calafate and
Perito Moreno city, less between
Perito Moreno and
Bariloche
. You must however be prepared for a long (10+ hours for 2 1/2 days) and rough trip in a small van. If you are not the kind of person who enjoys slow changes in the landscape and the beauty of lonely places, do not attempt this trip or you will regret it. Of course, if you really like this sort of thing, you will never forget the trip.
The bus trip will let you pass (and most likely stay and enjoy) through
El Chalten
and give an opportunity to stay in
Perito Moreno from where you can organise a (long) ride to visit the "
Cueva de las manos pintadas".