Is it ok to submit a paper to arXiv after copyright transfer?
The publisher allows uploading preprint versions (including revisions after reviewer comments)


If you're allowed to do it, you are allowed to do it. To be 100% sure, check the text of the copyright transfer agreement, where these policies are spelt out. Or, if you don't like reading legal text so much, it is summarized for many publishers in a nice color code at SHERPA/Romeo.