Gmc Duramax 2025. A forum community dedicated to chevy and gmc duramax diesel owners and enthusiasts. General motors has found a large enough issue with the 2024 and 2025 silverado / sierra 2500 hd / 3500 hd with the 10 speed allison transmission, that they released a service update for all owners.

Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! A forum community dedicated to chevy and gmc duramax diesel owners and enthusiasts.