Duramax Horsepower & Torque by Model Year The Duramax-Allison combination was first introduced for the 2001 model year, replacing the 440 lb-ft Detroit diesel with the 500 lb-ft LB7. I believe GM requires syn for front and rear axle SAE 75W-90 Synthetic Axle Lubricant, except in the case of the auto 4 wheel drive system which does not require syn and recommends SAE 80W-90 (which seems a bit odd to me but that is out of a 2013 owners manual.
Upgrade the look and performance of any 2000-2006 Chevrolet Silverado Duramax 2500HD/3500HD, including the 2007 Classic, with GlowShift's Black 7 Color Series Diesel Gauge Package. The motor, sometimes referred to as Baby Duramax, was slated to be offered in GM's light duty pickup trucks - the Chevrolet Silverado 1500 and GMC Sierra 1500 - for the 2010 model year. Since then, the Duramax has undergone a variety of changes, modifications, and enhancements, all necessary in the progression and evolution of the engine.