The need to meet strict Federal emissions standards in the United States resulted in the Duramax LMM, the first Duramax to feature a diesel particulate filter. The LMM's rated power only marginally topped the LBZ (2007.5 - 2010 model years).
As the evolution of the Duramax diesel continued, the LBZ rolled out to replace the LLY. The more powerful LBZ is often referred to the "Hot Rod" of the Duramax engine family as a result of its huge performance potential (2006 - 2007 model years).
Building upon the LB7's design, the Duramax LLY introduced a VVT turbocharger. For the 2006 MY, the LLY received several enhancements, including an upgraded injector design and higher maximum injection pressure (2004 - 2006 model years).
General Motor's joint venture with Isuzu, "DMax", produced the original 6.6L Duramax V-8. Featuring a high pressure common rail injection system and 4v per cylinder valvetrain, the Duramax replaced the long outdated Detroit diesel (2001 - 2004 model years).
Comprehensive list of changes made to the 6.6L Duramax LLY for the 2006 model year, resulting in significant performance gains.
Allison 1000 5 & 6 Speed Transmission Specs
The Allison 1000 five and six speed transmission has been the only automatic available mated to the Duramax diesel; specs & ratios here.
Easily identify which Duramax diesel your truck is equipped with by looking at your vehicle's VIN number.
Duramax Horsepower & Torque by Model Year
Chart showing rated horsepower and torque, broken down by model year and engine variation (LB7, LLY, LBZ, LMM, LML).
Essentially an Isuzu 6H series, the 7.8L Duramax is an inline 6 turbodiesel optional in 2003 to 2009 medium duty truck applications.
The 6.2L GM diesel was designed by Detroit diesel. The engine, introduced in 1982, was designed primarily as an economical alternative to gas guzzlers of the period.
The 6.5L GM diesel was an evolution of the 6.2L, designed to compete with more powerful diesel options of the time period.
The 4.5L Duramax LMK was introduced as a possible option for the Silverado and Sierra 1500 models but has since been dispelled.