HomeAll RepliesReply To: Sierra 1500 AT4 blown rear main seal at 7k miles Reply To: Sierra 1500 AT4 blown rear main seal at 7k miles Sponsored January 5, 2021 at 5:27 am #634383 wenrympeParticipant That’s very unfortunate. Hope it gets fixed, soon. Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored