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Discussion Starter #1
I notice that Chevrolet trucks build site (3500 DRW) is distinguishing between AWD and 4WD. Is this just a matter of semantics, or is there now not a 4WD selection option on an AWD vehicle.
 

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I notice that Chevrolet trucks build site (3500 DRW) is distinguishing between AWD and 4WD. Is this just a matter of semantics, or is there now not a 4WD selection option on an AWD vehicle.
All I see on the site is SRW 2x4 and 4x4 then DRW 2x4 and 4x4.

My 2020 3500 srw 4x4 has and auto mode on the selector. Maybe the AWD your seeing is referring to that.
 
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I just bought a 2020 3500HD this past weekend and had the same question. Dealer explained that the 4WD models do not have the auto option for the 4X4 system. If you add the auto option to the truck it then shows it as an AWD on the sticker.
 

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I discovered a detailed explanation on one dealer's web site (though I remain uncertain). It explained that AWD is just that, like AWD in other vehicles —the computer decides which wheels get driven and when. I lacks a transfer case and the 4WD or 2WD option switch. Reasoning is lighter and cheaper. I dunnnnoooo.
 

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Discussion Starter #6

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The system provides five modes: Auto 4WD, 4HI, 4LO, 2HI and Neutral.


Work It: All-New 2020 Chevrolet Silverado HD and GMC Sierra HD Debut
June 27, 2019
Bigger, stronger and more powerful than ever, the completely new 2020 Chevrolet Silverado 2500HD/3500HD (Fig. 1) and GMC Sierra 2500HD/3500HD (Fig. 2) trucks offer increased capability and an expanded range of options for customers. Compared to the current HD models, the new trucks are larger in virtually every measure. The HD trucks are available in 3/4-ton 2500, 1-ton 3500 single rear wheel, and 1-ton 3500 dual rear wheel configurations with either 2WD or 4WD.

Fig. 1

Fig. 2

The Silverado HD lineup includes Work Truck, Custom, LT, LTZ, and High Country models. Sierra HD models include Sierra, SLE, SLT, new AT4, and Denali trim lines.
The trucks offer a number of advanced features designed to deliver for HD customers, including:
  • Enhanced cooling system for vehicles equipped with the Duramax® 6L diesel engine
  • Available Autotrac Active 2-speed transfer case on 4WD models
  • Available dual alternators on both gasoline and diesel engine options for power needed in commercial applications
  • A modular front on the trucks that enables easier mounting of a snowplow
  • Available 120 V alternating current power outlet located at the rear of the cargo box for electrical equipment that uses a maximum of 150 watts
  • Available power up/down tailgate on Silverado HD and the innovative MultiPro tailgate (Fig. 3) on Sierra HD
  • Available enhanced trailering system featuring a class-leading 15 camera views

Fig. 3

Powertrains
There are a choice of two powertrains: the standard all-new 6.6L V8 gasoline engine (RPO L8T) and 6-speed 6L90 automatic transmission or the available Duramax® 6.6L V8 diesel engine (RPO L5P) and the all-new Allison 10-speed automatic transmission with an available integrated PTO option.
The new 6.6L V8 gas engine features a cast-iron small block with aluminum heads and direct fuel injection. It produces 401 horsepower and 464 lb.-ft. of torque. With a longer stroke, it delivers more than 21 percent greater torque than the previous 6.0L V8 gas engine.
The Duramax 6.6L V8 turbo-diesel engine produces 445 horsepower and 910 lb.-ft. of torque and offers exceptional durability with its hardened engine block that uses a deep skirt design and light-weight aluminum cylinder heads. Combined with the new Allison 10L1000 automatic transmission, the HD trucks have a 35,000 lb. maximum towing rating when properly equipped. (Fig. 4)

Fig. 4

All-Wheel Drive
The available Autotrac system (RPO NQH) is a 2-speed automatic, active transfer case. The system provides five modes: Auto 4WD, 4HI, 4LO, 2HI and Neutral. (Fig. 5) The Auto 4WD position offers the capability of an active transfer case with on-demand torque biasing wet clutch and easy vehicle tuning through software calibrations. The software calibrations allow for vehicle speed dependent clutch torque levels to enhance the performance of the system.

Fig. 5

For example, the system is calibrated to provide 0–5 lb.-ft. of clutch torque during low speed, low engine torque operation, and predetermined higher torque for 25 mph (40 km/h) and greater. These calibrations prevent crow-hop and binding at low speeds and provide higher torque biases at higher vehicle speeds in order to enhance stability.

New Technology
The HD trucks offer an extensive number of new technologies and safety features, including:
  • Forward Collision Alert
  • Following Distance Indicator
  • Automatic Emergency Braking
  • Front Pedestrian Braking
  • Front and Rear Park Assist
  • Rear Cross Traffic Alert
  • Lane Departure Warning
  • Safety Alert Seat
  • HD Surround Vision
  • Head-Up Display

Many of the vehicle controls, including some safety features, the available diesel exhaust brake, and available Integrated Trailer Brake Controller can be operated or turned on/off using the switchbank and other controls on the center of the instrument panel. (Fig. 6)

Fig. 6

Trailering System
The available Advanced Trailering System (Silverado HD) and ProGrade Trailering System (Sierra HD) features up to15 camera views (up to two accessory cameras can be installed), including high-definition Surround Vision and other unique views, such as a transparent trailer view feature (Fig. 7) to help see behind the trailer when towing and a hitch view camera that aids in connecting a trailer to the vehicle. To check the available camera views when in Drive, touch the Camera icon on the infotainment screen and select the desired view. Touch X on the screen to exit the view.

Fig. 7

In addition to the trailering system, other trailer technologies and hardware that are available on the new HD trucks include:
  • Auto Electric Park Brake – automatically applies the parking brake to help maintain truck position when hitching
  • New Park Grade Hold Assist – enhances hill hold by using braking effort at each wheel for an extended period of time
  • Integrated Trailer Brake Controller – works with the trailer profile in the Trailering App to recall a specified trailer’s most recent gain setting
  • Tow/Haul Mode – remains engaged on the next key-on cycle, for up to four hours; includes a reminder the feature is engaged
  • Hill Start Assist and Hill Descent Control
  • Trailer Sway Control
  • Auto Grade Braking and Diesel Exhaust Braking
  • Digital Variable Steering Assist – dynamically optimizes power steering according to driving scenarios, including trailering, and enables road pull compensation and other features
  • Trailering Info Label – located on the driver’s door jamb with the truck’s specific trailering information, including curb weight, GVWR, GCWR, maximum payload, maximum tongue weight and rear GAWR.

New, larger door-mounted trailering mirrors are standard on all 2500HD and 3500HD models. The trailering mirrors have been redesigned with improved perimeter lighting. The mirrors extend and retract using a four-bar-link system for smooth operation, whether done manually or with the available power extension controls. A new forward-facing spot lamp on each mirror shines light at about a 45-degree angle, providing illumination on the job site or campsite. There also are side-view cameras mounted within the mirror housings, and when equipped, mirror-mounted puddle lamps and two rearward-facing spot lamps.
To extend the trailering mirrors manually, grasp the mirror housing firmly and pull back in one motion, arching slightly toward the rear of the vehicle. (Fig. 8) To return the mirror to its original position, reverse the motion.

Fig. 8


Action Center
A Technical Assistance Center (TAC) Action Center (U.S.) has been established for product feedback on the 2020 Silverado HD and Sierra HD. Any vehicle issues that warrant prompt and immediate attention should be reported to TAC, not just concerns requiring technical assistance. Any concerns will be answered by a Silverado HD/Sierra HD specialist. The Action Center is connected directly to TAC, Engineering, and the assembly plant in order to address any product concerns.
To report a concern, create a TAC Case using the Dealer Case Management (DCM) system. Refer to Bulletin #08-00-89-014E for more information about using the DCM system. The Silverado HD/Sierra HD specialist will provide any diagnostic direction as needed through the DCM. Contact TAC if needed once a case has been started.
For additional information on the new 2020 Silverado HD and Sierra HD, refer to Bulletin #19-NA-091.
 
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Discussion Starter #8
I guess that answers it. Thanks.
 

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GM's "Autotrac system" is very cool. Had it on my first new truck, a 1999 1500 Z-71 extended cab. I could drive on dry pavement, system would stay in 2wd, no problem. When sensed slip, would automatically engage the front axle and get the truck in to 4wd. I loved driving on snow pack, giving it some gas, and feeling the front kick in.

I think it's cool GM got this technology in the HD trucks for 2020!
 
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