Parts & Accessories Peace be upon you and God's mercy and blessings, The question that is always repeated to us... Why do American GMC gearboxes start to clunk or get stuck in gears, especially in Sierra, Yukon, and Denali? The reason is often not just oil or programming as they say. Many of these gearboxes suffer due to oil heat, delayed shifting, or using the wrong oil, and then the problems start gradually: Jerks — Delayed shifting — Getting stuck — Misfiring — Higher fuel consumption. 📌 We completely dismantle the gearbox in the workshop, inspect the clutches, valve body, pump, and debris before any work. The work is done with original parts, with full programming and testing after installation, and oil is included. 5 months warranty on the entire job Includes dismantling, installation, oil, and programming. And most importantly... Our goal is to solve the problem from its roots, not to temporarily silence it. A radical and guaranteed solution, and if the problem is not solved, the customer is not obligated to pay. Contact via WhatsApp or call #GMC #Yukon #Denali #Sierra #GMC #Yukon #Denali