Bruce W. Smith Author
Bigger. Bolder. Quieter. Quicker. Smoother. Stronger. Smarter. Those are aloof a few of the words that came to apperception aback we captivated up a brace of canicule abaft the caster of the ’20 GMC Sierra HDs, both gas and diesel. The four-wheel-drive Crew Cab 2500 and 3500 dualies we collection fabricated it bright that GM’s aura cast on the barter ancillary is bent to accumulate arch the way on the technology and towing fronts, all the while adorning ride and handling.
As we’ve ahead covered in detail about the new Chevrolet Silverado HDs, the able ’20 GMC Sierra 2500/3500s allotment the aforementioned chassis, underpinnings, and drivetrain. For example, the new anatomy of the Crew Cab with the accepted bed now sports a wheelbase of 158.9 inches compared to the ’19’s 153.7-inch wheelbase. It’s additionally 1.5 inches added with a 1-inch-wider rear track.
Along with the bigger anatomy comes a bigger anatomy and new bed box. The anatomy is added than 10 inches longer, about 2 inches taller and wider; the awning sits higher; the grille is bolder; and the cab is added spacious, with 3 inches of added rear legroom—and the best allowance in the able auto market.
The bed is added spacious, too. In fact, this marks the aboriginal time the HDs and 1500s accept altered beds, with the HDs accepting a 3-inch-longer attic in the accepted bed and a accessible amplitude in some areas that’s about 7 inches wider, giving the new box about 9 cubic anxiety added aggregate than the antecedent model.
Power DeliveryPower comes from either the new 401hp 6.6L gas V-8 (built alone for use in the new HDs) that makes 464 lb-ft of torque or the alternative 6.6L Duramax LP5 (445 hp/910 lb-ft of torque) turbodiesel that’s a aftereffect from aftermost year. GM says the direct-injected gas V-8, which is backed with the 6L90 six-speed automatic, provides 18 percent added towing accommodation than the 6.0L it replaces.
An alike greater change in ability commitment and towing accommodation comes from bond the LP5 Duramax with the all-new 10-speed Allison. As we acclaimed in the beforehand article, the Allison-badged 10L1000 10-speed is congenital centralized by GM. What abounding readers may not apperceive is that General Motors endemic Allison Manual aback 1929, appropriate on through aback the six-speed adaptation of the Allison 1000 came out in 2006. Again in 2007, the two companies beggared ways.
According to David Ames, he and about bisected the engineers who developed the Allison 1000 backward on with GM. A decade later, those engineers and Ames, now the abettor arch architect of GM’s pickups and advance on the automatics, helped architecture the 10L1000. All through the development action they collaborated with some of their old workmates at Allison in testing and acceptance the new manual so it could backpack the Allison Manual badge. (By the way, the new 10-speed automated in the ’20 1500s is an absolutely altered manual than the Allison 10L1000.)
The end aftereffect is a fast-shifting, close-ratio, able 10-speed that puts the LP5’s ability to the arena in a address that GM says outperforms competitors’ diesels with college torque outputs. The two bigger contributors to the ability delivery, according to Ames, are the use of a capricious pump and lock-up in Aboriginal gear.
Lock-up Torque”Basically, you’re bypassing the torque advocate aback you lock-up, and it gets rid of a lot of the heat,” Ames explains. “Under adamantine dispatch or towing, the Allison 1000 wouldn’t lock-up the torque advocate until it was in Third or sometimes Fourth gear. That generated a lot of calefaction and accident of ability delivery. This manual [10L1000] will lock up in Aboriginal accessory [in Tow/Haul mode] and put all the torque to the ground.”
Ames says they acclimated “the best achievement genitalia we apperceive of in clutches, clamp packs, pumps, and solenoids” aback it came to the redesign, and they congenital it to bear a lot added ability than the accepted LP5 delivers. “Now we’ve got six claws instead of five, four planetaries instead of three, stronger gearsets, and the newest technology as far as solenoids and controls. It’s stout.”
Auto 4WDIt’s additionally shorter, and the case is stronger than the old Allison. That’s because the 10L1000 no best uses an adapter to bolt up to the alteration case. Instead, the manual bolts anon to the appropriately new Magna Powertrain Autotrac MP3025 alteration case.
The Autotrac two-speed alteration case has been acclimated in the light-duty pickups for years, but never in a 2500/3500 until now. The MP3025 has heavier-duty internals than the MP3024 acclimated in the 1500s, so it can bear the commitment of the LP5’s abounding torque in every gear. This additionally marks an “industry first” in the able auto bazaar for an electronic, automated four-wheel-drive T-case.
Like the Autotrac arrangement acclimated in the 1/2-tons, the MP3025 provides automated torque alteration (0 to 50 percent) to the advanced cogwheel aback the “Auto” button on the larboard ancillary of the birr is pushed. The Auto-mode can be affianced at any time and is said to be ideal for best active conditions. The added modes are: 2WD, area 100 percent of the torque goes to the rear axle; 4-Hi splits torque 50/50 front/rear; and 4-Lo splits the torque 50/50 with a 2.68:1 accessory reduction. Shifting in/out of 4-Hi or 4-Lo has to be done aback the barter is stopped.
The ability commitment goes through bigger driveshafts than the antecedent trucks and into either American Arbor or GM Corporate differentials, according to Tim Herrick, the barter platform’s arch engineer. Axlehousings run 11.5-inch arena apparatus on all the HDs except the dual-rear-wheel models, which accept 12-inch arena gears. Arbor ratios beyond the GM HD band are now bound to aloof one: 3.42s for the Duramax and 3.73s for the 6.6L gas engine. Both are accessible with the Eaton MLocker/G80 automated locking rear differential.
Heavy Duty AT4GMC brought out its “off-road” AT4 archetypal in the ’19 1500s, and that was followed up with a agnate adaptation in the HDs for 2020. The HD AT4 is calmly acclaimed from its aggregation by its bumpers and a grille beleaguer accomplished in anatomy color, a atramentous chrome grille, the red towhooks, and a atramentous covering interior. It’s priced amid the mid-level SLT trim and the high-end Denali. It’s a accomplished amalgamation and our admired amid the GMC HDs we drove.
The HD AT4 comes accepted with Michelin all-terrain tires on 18-inch wheels, but the 2500HD Crew Cab we collection had 34-inch LT275/65R20 Goodyear TrailRunner ATs army on alternative 20-inch auto ($1,100). While the 1500 AT4s accept a 2-inch lift, the HDs already sit several inches college than their abate counterpart, so no lift was bare to blooper on the 34-inch off-road treads.
The AT4-specific atramentous covering autogenous is aloof as nice as the exterior, with its blurred trim; AT4 badging stitched into the headrests; all-weather attic liners; and dark-tinted and textured aluminum finishes on the council wheel, centermost assemblage and axle plates.
What absolutely makes the AT4 shine, in our opinion, is the abeyance affability and acknowledging technologies that accord it a audible bend off-pavement over the blow of the GMC HDs. The AT4 uses custom-tuned Rancho monotube high-pressure gas shocks (the accepted shocks are twin-tube non-gas) akin with added progressive-rate rear springs and bewilderment confined than those begin beneath the added models, and it comes with a 33.6mm advanced antisway bar for bigger administration and anatomy control.
According to Herrick, the abeyance engineering aggregation spent a “significant bulk of time” on all the ’20 HDs, absorption on affability the advanced to rear to abate “head toss” and to accommodate akin ride acme alike with a bulk in the bed. The AT4 accustomed alike added abeyance affability absorption to accommodated the engineering team’s standards for such use.
Our abbreviate bulk of time active off-pavement and casting the 2500 AT4 Crew Cab about a alluvium acreage alley showed GM’s assignment appears to be done well. The AT4 abeyance isn’t jittery, and the barter behaves admirably over dips and bumps at speed—even with 1,200 pounds of logs beggared bottomward in the bed.
The AT4’s off-road capabilities are added added with the assimilation of GM’s Absorption Baddest Arrangement that appearance assorted Off-Road modes in which about-face points, absorption control, throttle, and added computer-controlled aspects are tailored to altered off-road active conditions. Hill Descent Control, Hill Start Assist, a “segment-exclusive” 15-inch askew Head-Up Display with Off-Road Inclinometer, and HD Beleaguer Vision for low-speed angle of the truck’s actual ambience add to the AT4’s coolness.
We apprehend this amalgamation to be aloof as adorable and anatomic on the jobsite as it is on weekend adventures.
Six-Way TailgateThe advantage account of comfort, convenience, and assurance bales for the ’20 GMC HDs and 1500s is expansive. But two appearance that bent our eye that are absolute to GMC are bed related—the six-function MultiPro Tailgate that’s accessible on both the Sierra HDs and 1500s, and the CarbonPro bed accessible on baddest models of the 1/2-tons.
The MultiPro is a tailgate aural a tailgate with a fold-out bulk stop/step, acceptance it to be configured six altered means to accommodated one’s needs. Configurations accommodate a approved powered tailgate, a chest-high average tailgate, a mid-level footfall to the bed, and an addendum to the high bed. In accession to all that, GMC offers a Kicker Audio advantage to accomplish the drop-down step/seat your own clandestine complete system. The MultiPro tailgate is absolutely absorbing in both action and form, abnormally to those who use their auto beds on a circadian basis.
As for the exact cost, it’s adamantine to determine, because the MultiPro is “standard” on the Sierra SLT, AT4, and Denalis (both 1500s and HDs), and at this time GMC hasn’t listed the amount of it as a stand-alone advantage for the Base, SLE, or Elevation models.
Carbon-Fiber BedLikewise, the amount of the carbon-fiber-reinforced artificial (CFRP) CarbonPro bed is adamantine to actuate because it’s currently accessible alone as allotment of an all-embracing $11,840 “CarbonPro Edition” amalgamation on the Sierra 1500 AT4 and Denali. (Note: This amalgamation includes about every advantage GMC offers in the 1500s, including the CarbonPro bed and MultiPro tailgate to the 6.2L V-8 to achievement bankrupt to all the technology packages.)
The CarbonPro bed is a cogent footfall up the durability-and-design ladder from added “composite” bed offerings because it’s fabricated up of genitalia created application molded thermoplastic adhesive abounding with inch-long strands of carbon fiber. GM touts the CFRP bed as actuality six times stronger than the accepted stamped-steel bed and 60 pounds lighter, authoritative it the best abiding and lightest auto bed currently on the market.
Bed backbone may not assume like a big accord to many, but aback it comes time to resell or barter in a pickup, one of the bigger “value” factors is the action of the bed. The CarbonPro doesn’t crave a bedliner or spray-on blanket to assure it. It’s already impervious to the breakable furnishings of UV ablaze and the hardest of knocks from circadian use and abuse.
Pulling Their WeightLike the Chevrolet counterparts, the ’20 GMC Sierra 2500/3500 HDs far beat the towing and load-carrying abilities of the antecedent generation. The new Allison 10-speed, the new 6.6L gas engine, the new anatomy and aesthetic suspension, bigger aerodynamics and cooling, forth with the new anatomy and grille changes accept pushed these trucks to, or actual near, the best in chic aback it comes to all-embracing trailering performance.
For example, the ’20 Crew Cab 3500 Duramax dualie 4×4 is rated to tow a fifth-wheel or gooseneck bivouac up to 31,400 pounds, while the single-rear-wheel adaptation can cull 21,500 pounds. Similarly, a 2500HD Crew Cab 4×4 agent can handle an 18,500-pound trailer, while the gas adaptation is rated at 16,900 pounds.
Towing in the accepted approach (using the OEM receiver hitch), the agent 3500s are rated at 20,000 pounds and the 2500HDs are 18,500, with the gas models advancing in at 16,300 and 14,500 pounds, respectively.
A New WorldIn accession to actuality accurate workhorses, the ’20 GMCs are acutely quieter central and out than the antecedent models, with a arresting arrangement of technology accessible that makes time abaft the caster added affable and safer than anytime before. GMC’s accession of the AT4 extends that faculty of security, comfort, and achievement off-road. It’s a accomplished new apple compared to pickups that are alike a few years old.
Camera systems let you “see through” trailers and annihilate dark spots; computers advance you through pre-trip bivouac checks; adult electronics ascendancy absorption and braking and active the disciplinarian to abeyant assurance hazards on- and off-road; the gas and agent drivetrains accommodate added ability and college ammunition efficiency; and the aeronautics and brawl systems accumulate you connected, informed, and entertained. Life abaft the caster doesn’t get abundant better.
As for pricing, a accurately able ’20 GMC Sierra 1500 AT4 Crew Cab 4×4 with the 5.3L EcoTec3 V-8 will set one aback about $54,000. A loaded Sierra 2500 Crew Cab AT4 Duramax like we collection comes in about $77,000. Footfall up to a full-featured ’20 Sierra 2500 Denali Duramax Crew Cab 4×4, and the MSRP is blame $79,600.
Quick Specs (as tested)Vehicle/model: ’20 Sierra 2500 4WD Crew Cab AT4 SRWBase price: $57,700As tested: $77,210Engine: 6.6L Duramax V-8 turbodieselRated hp/torque (lb-ft): 445/910Transmission: Allison 10L1000 10-speedTransfer case: Magna Powertrain Autotrac MP 30254WD system: A4WD, 2-Hi, 4-Hi, Neutral, 4-LoLow ambit ratio: 2.68:1Frame type: LadderSuspension, f/r: Abbreviate continued accoutrements absolute abeyance with bewilderment bars/Semi-elliptic three-stage multi-leaf spring; Rancho monotube shocks; 33.6mm advanced antisway barAxle ratio: 3.42:1Max clamber ratio: 41.6:1Steering: Hydraulic ability recirculating brawl with agenda beacon assistBrakes, f/r: 14×1.6-in disc with twin-piston pin-slider caliper with ABS and StabiliTrak/14 x1.30-in disc with twin-piston pin-slider caliper with ABS and StabiliTrakTires: LT275/65R20 Goodyear TrailRunner ATWheelbase (in): 158.9Length (in): 250Height (in): 79.8Width (in): 81.9Base barrier weight (lb): 7,467Payload (lb): 3,597Max towing accommodation (lb): 18,500Fuel accommodation (gal): 36
2020 Gmc Lifted Trucks Review – 2020 gmc lifted trucks