Almost all are rh threads.Ive only seen a few LHs.For sure some were Ford diesels abd they had a tag that said LH threads.One guy at work broke a wp on one trying to get the fan off rh.After he broke it he asks for help.I look and say I hope you were going the opposite direction.Nope.That was costly at around 350 bucks for the shop.It was on an ambulance.Rocky