GAW: Can you bring even an example of Rav Chaim disagreeing with the Steipler or of Rav Shmuel Auerbach disagreeing with Rav Shlomo Zalman — especially on a large notable issue?
Rav Moshe Feinstein assured Heart transplants, I have heard that Rav Tendler has permitted it because they are now safer than Rav Moshe assured them (He held that the doctor who removed the heart from the patient halachically killed them)