The General Motors (GM) case stands out for its transnational employee cooperation. During the crisis the ‘national turn’ of union politics seems to have eroded solidarity and mutual trust relations. In this article the authors suggest disentangling the behaviour of labour representatives and their attitudes, identities and feelings to develop a more sophisticated perspective on labour transnationalism. Concepts of sociological neo-institutionalism and empirical evidence from two automobile companies (GM/Opel and Volkswagen) in Germany, the UK and Poland are used to investigate the conditions under which transnational solidarity occurs and prevails. The authors conclude that solidarity in both companies has not come to an end and contributes to repertoires of contention in future labour conflicts.