The all-new 2021 GMC Yukon dropped cover earlier this year with a swath of updates and new features, including a new diesel powerplant and the addition of the off-roader AT4 trim level. However, GM Authority has learned from sources familiar with the product plans that the new GMC Yukon AT4 will not offer the option for diesel power under the hood.
The reason comes down to the 2021 GMC Yukon AT4’s unique front fascia, which includes a revised lower section that’s higher cut than the standard 2021 Yukon fascia. While the new fascia looks great and comes with a higher approach angle, adding to the AT4’s off-road worthiness, it also obstructs the intercooler and intercooler piping needed for the new 3.0L I-6 LM2 Duramax turbodiesel engine. Thus, the engine will not be offered on the AT4 trim level.
As a result, the only engine that will be offered on the 2021 GMC Yukon AT4 will be the naturally aspirated 5.3L V8 L84 (EcoTec 3 family), with Dynamic Fuel Management, Direct Injection, and Variable Valve Timing. Output from the ‘eight is rated at 355 horsepower at 5,600 rpm, and 383 pound-feet of torque at 4,100 rpm.
The GM 10-speed automatic transmission is onboard for shifting duties, while AT4 trim levels equip a two-speed active electronic Autotrac transfer case, which includes a neutral position for dinghy towing.
Meanwhile, the naturally aspirated 6.2L V8 L87 is standard and exclusive to the plush Yukon Denali trim level, throwing down 420 horsepower and 460 pound-feet of torque. Like the L84 V8 and LM2 turbodiesel, it too mates to the new GM 10-speed automatic transmission.
Should GM revise the 2021 GMC Yukon AT4’s front fascia to accommodate the LM2 diesel engine? Let us know in the comments, and make sure to subscribe to GM Authority for more GMC Yukon news, GMC news, and around-the-clock GM news coverage.