The Allison Limp: Why Your Duramax is Stuck in 3rd Gear

If you use your Duramax diesel for heavy towing, you know there is no better partner than the Allison automatic transmission. It’s a legendary gearbox built for punishment. However, even the toughest setups have a built-in defense mechanism that can catch you completely off guard: Transmission Limp Mode. Imagine pulling a heavy camper down Highway