General Motors rolled out an all-new generation for the Chevy Tahoe and Chevy Suburban in conjunction with the 2021 model year, with the forthcoming 2024 model year originally expected to introduce a mid-cycle refresh for both SUV nameplates. As GM Authority covered previously, this is no longer the case, with the refreshed Tahoe and Suburban now expected to arrive for the 2025 model year, if not later. Notably, the 2024 Chevy Tahoe and 2024 Chevy Suburban will carry over the 3.0L I6 LM2 turbodiesel Duramax engine, rather than offer the new 3.0L I6 LZ0 turbodiesel Duramax engine.
For those readers who may be unaware, the 2024 Chevy Tahoe and 2024 Chevy Suburban were originally anticipated to offer the new 3.0L I6 LZ0 turbodiesel Duramax engine as a replacement for the 3.0L I6 LM2 turbodiesel Duramax engine offered currently. The new LZ0 engine was expected to be offered in conjunction with the 2024 model-year refresh. Now, however, with the refresh expected to arrive for the 2025 model year or later, the 2024 Chevy Tahoe and 2024 Chevy Suburban will continue to offer the 3.0L I6 LM2 turbodiesel Duramax engine as the optional oil-burner powerplant.
For reference, the 3.0L I6 LM2 turbodiesel Duramax engine is rated at 277 horsepower at 3,750 rpm and 460 pound-feet of torque at 1,500 rpm, while the 3.0L I6 LZ0 turbodiesel Duramax engine is rated at 305 horsepower at 3,750 rpm and 495 pound-feet of torque. The LZ0 is currently available under the hood of the 2023-and-newer Chevy Silverado 1500 and GMC Sierra 1500 pickup trucks. Those figures represent a 10-percent increase in power and a 7.6-percent increase in torque over the LM2, which are the result of new steel pistons, a retuned turbo compressor, new fuel injectors, and improved temperature controls.
The LM2 mates to the GM MQC 10-speed 10L80 automatic transmission, while the LZ0 mates to the GM MQB 10-speed 10L80 automatic transmission.