2020 GMC Sierra 1500 SLT vs. AT4
iSeeCars' unbiased and data-driven comparison of the 2020 GMC Sierra 1500 SLT and 2020 GMC Sierra 1500 AT4 contrasts the two cars across a broad spectrum of vehicle specifications to determine which car is better. In addition to comparing pricing and specs, iSeeCars uses all the ratings, rankings, and insights from its comprehensive analyses of each vehicle model, including calculations of reliability, safety, depreciation, value retention, and the vehicle's projected lifetime recalls (based on analyzing over 25 billion data points). This in-depth evaluation is used to identify which vehicle represents a better overall choice for shoppers who are considering both the 2020 GMC Sierra 1500 SLT and the 2020 GMC Sierra 1500 AT4.
When we compare the 2020 GMC Sierra 1500 SLT's and the 2020 GMC Sierra 1500 AT4's specifications and ratings, the 2020 GMC Sierra 1500 SLT has the advantage in the areas of typical lower range of pricing for used cars, and fuel efficiency. The 2020 GMC Sierra 1500 SLT and 2020 GMC Sierra 1500 AT4 have the same overall quality score base engine power. Based on this comparison of the 2020 GMC Sierra 1500 SLT's and the 2020 GMC Sierra 1500 AT4's specifications and ratings, the 2020 GMC Sierra 1500 SLT is a better car than the 2020 GMC Sierra 1500 AT4.
Pricing: A used 2020 GMC Sierra 1500 SLT ranges from $32,999 to $47,997 while a used 2020 GMC Sierra 1500 AT4 is priced between $37,111 to $52,842.
Resale/Retained Value: Looking at the 5-year depreciation rate, the 2020 GMC Sierra 1500 SLT and the 2020 GMC Sierra 1500 AT4 both lose 38.1 percent of their value.
Quality Rating: The iSeeCars Overall Quality rating for the GMC Sierra 1500 is 8.6 out of 10. GMC Sierra 1500 is ranked 5 out of 11 Best Full-Size Trucks based on its reliability, retained value, and safety ratings.
Reliability Rating: iSeeCars' Reliability Rating for the GMC Sierra 1500 is 8.8 out of 10.
Engine Power and Fuel Efficiency Comparison: For engine performance, the base engine of both the 2020 GMC Sierra 1500 SLT and the 2020 GMC Sierra 1500 AT4 makes 355 horsepower. The SLT is rated to deliver an average of 19 miles per gallon, with a highway range of 552 miles. The AT4 is rated to deliver an average of 18 miles per gallon, with a highway range of 504 miles. This gives the 2020 GMC Sierra 1500 SLT the fuel efficiency and maximum range advantage over the 2020 GMC Sierra 1500 AT4. Both models use regular unleaded.
Available Cab Types and Bed Lengths: Both the 2020 GMC Sierra 1500 SLT and the 2020 GMC Sierra 1500 AT4 are available in Crew Cabor an Extended Cab configuration. Both the 2020 GMC Sierra 1500 SLT and the 2020 GMC Sierra 1500 AT4 offer bed lengths of 69.9, 79.4, and 98.2 inches.
Safety Ratings: The GMC Sierra 1500 has an average safety rating of 4.40 out of 5 Stars based on NHTSA's crash test ratings.
New Car Pricing
Asking Price:
-
Starting MSRP:
$44,500
Category Avg Starting MSRP:
(Full-Size Pickup Trucks)
$32,692
Category Starting MSRP Range:
(Full-Size Pickup Trucks)
$28,200 - $44,580
New Car Pricing
Asking Price:
-
Starting MSRP:
$51,300
Category Avg Starting MSRP:
(Full-Size Pickup Trucks)
$32,692
Category Starting MSRP Range:
(Full-Size Pickup Trucks)
$28,200 - $44,580
Used Car Pricing
Avg Used Car Price:
$40,934
Price Range:
$32,999 - $47,997
Category Avg Price:
(Full-Size Pickup Trucks)
$36,220
Category Avg Price Range:
(Full-Size Pickup Trucks)
$28,148 - $41,515
# Used Cars for Sale Nationally:
401
Avg Mileage of Used Cars for Sale:
80,358
# Good or Great Deals:
100
Used Car Pricing
Avg Used Car Price:
$45,244
Price Range:
$37,111 - $52,842
Category Avg Price:
(Full-Size Pickup Trucks)
$36,220
Category Avg Price Range:
(Full-Size Pickup Trucks)
$28,148 - $41,515
# Used Cars for Sale Nationally:
260
Avg Mileage of Used Cars for Sale:
80,611
# Good or Great Deals:
50
GMC Sierra 1500 Scores & Rankings
Overall Score:
8.6 / 10
Reliability:
8.8 / 10
Retained Value:
8.1 / 10
Safety:
8.8 / 10
GMC Sierra 1500 Scores & Rankings
Overall Score:
8.6 / 10
Reliability:
8.8 / 10
Retained Value:
8.1 / 10
Safety:
8.8 / 10
iSeeCars Reliability Insights for 2020 GMC Sierra 1500 SLT
Remaining Life Expectancy (years):
7.9
Typical Category Remaining Life Expectancy:
(Full-Size Pickup Trucks)
8.1
Category Remaining Life Expectancy Range:
(Full-Size Pickup Trucks)
7.3 - 10.3
Chance of Reaching 200k Miles for a New Car:
48.1%
iSeeCars Reliability Insights for 2020 GMC Sierra 1500 AT4
Remaining Life Expectancy (years):
7.9
Typical Category Remaining Life Expectancy:
(Full-Size Pickup Trucks)
8.1
Category Remaining Life Expectancy Range:
(Full-Size Pickup Trucks)
7.3 - 10.3
Chance of Reaching 200k Miles for a New Car:
48.1%
Expected 30-year Lifetime Recalls
Expected Lifetime Recalls:
9.7
Typical Category Recalls:
(Full-Size Pickup Trucks)
9.4
Category Range for Recalls:
(Full-Size Pickup Trucks)
1.7 - 13.9
Expected 30-year Lifetime Recalls
Expected Lifetime Recalls:
9.7
Typical Category Recalls:
(Full-Size Pickup Trucks)
9.4
Category Range for Recalls:
(Full-Size Pickup Trucks)
1.7 - 13.9
GMC Sierra 1500 Rankings
Ranking
1 out of / 8Ranking
2 out of / 11Ranking
2 out of / 11Ranking
2 out of / 11Ranking
2 out of / 3Ranking
3 out of / 11Ranking
3 out of / 11Ranking
4 out of / 11Ranking
4 out of / 11Ranking
4 out of / 11Ranking
5 out of / 11Ranking
5 out of / 6Ranking
7 out of / 11GMC Sierra 1500 Rankings
Ranking
1 out of / 8Ranking
2 out of / 11Ranking
2 out of / 11Ranking
2 out of / 11Ranking
2 out of / 3Ranking
3 out of / 11Ranking
3 out of / 11Ranking
4 out of / 11Ranking
4 out of / 11Ranking
4 out of / 11Ranking
5 out of / 11Ranking
5 out of / 6Ranking
7 out of / 11Available Body Styles
Pickup Truck
Available Body Styles
Pickup Truck
Available Cab Types
Crew Cab, Extended Cab
Available Cab Types
Crew Cab, Extended Cab
Available Bed Length(s)
69.9 inches, 79.4 inches, 98.2 inches
Available Bed Length(s)
69.9 inches, 79.4 inches, 98.2 inches
Available Drivetrain Options
Diesel, Gasoline
Available Drivetrain Options
Diesel, Gasoline
Other GMC Sierra 1500 Trim Levels
AT4, Base, Denali, Elevation, SLE
Other GMC Sierra 1500 Trim Levels
Base, Denali, Elevation, SLE, SLT
Warranty Information
Warranty, Bumper-to-Bumper:
3 years / 36000 miles
Warranty, Powertrain:
5 years / 100000 miles
Warranty, Roadside Assistance:
5 years / 60000 miles
Warranty Information
Warranty, Bumper-to-Bumper:
3 years / 36000 miles
Warranty, Powertrain:
5 years / 100000 miles
Warranty, Roadside Assistance:
5 years / 60000 miles
Safety Ratings
NHTSA Safety Rating (last 5 year average):
4.40 out of 5 Stars
2025 NHTSA Overall Rating:
4 out of 5 Stars
2025 NHTSA Front Crash Overall Rating:
4 out of 5 Stars
2025 NHTSA Side Crash Overall Rating:
5 out of 5 Stars
2025 NHTSA Rollover Rating:
4 out of 5 Stars
IIHS Safety Rating:
Not yet available
Safety Ratings
NHTSA Safety Rating (last 5 year average):
4.40 out of 5 Stars
2025 NHTSA Overall Rating:
4 out of 5 Stars
2025 NHTSA Front Crash Overall Rating:
4 out of 5 Stars
2025 NHTSA Side Crash Overall Rating:
5 out of 5 Stars
2025 NHTSA Rollover Rating:
4 out of 5 Stars
IIHS Safety Rating:
Not yet available
Base Drivetrain Specs
Horsepower:
355 hp @ 5600 rpm
Torque:
383 foot-lbs @ 4100 rpm
Power-to-Weight Ratio (higher is better):
0.074 hp per pound
Towing capacity:
9600 lbs
Max Payload:
1950 lbs
Base Drivetrain Specs
Horsepower:
355 hp @ 5600 rpm
Torque:
383 foot-lbs @ 4100 rpm
Power-to-Weight Ratio (higher is better):
0.069 hp per pound
Towing capacity:
9300 lbs
Max Payload:
1710 lbs
Engine Specifications
Engine Size:
5.3 liters
Engine Configuration:
V
Number of Cylinders:
8
Transmission:
Automatic
Standard/Optional Drivetrain Type:
4X2 / 4X4
EPA Fuel Economy
(City/Highway/Combined MPG):
17 / 23 / 19
Range (city/hwy):
408 / 552 miles
Recommended Fuel Type:
Regular Unleaded
Engine Specifications
Engine Size:
5.3 liters
Engine Configuration:
V
Number of Cylinders:
8
Transmission:
Automatic
Standard/Optional Drivetrain Type:
4X4
EPA Fuel Economy
(City/Highway/Combined MPG):
16 / 21 / 18
Range (city/hwy):
384 / 504 miles
Recommended Fuel Type:
Regular Unleaded
Standard/Optional Features
Alloy wheels:
Standard
Android Auto:
Standard
Apple CarPlay:
Standard
Bench Seats:
Standard
Bluetooth:
Standard
Front Bench Seats:
Standard
Heated Seats
Standard
Heated Steering Wheel:
Standard
Keyless Entry:
Standard
Keyless Ignition:
Standard
Leather Upholstery:
Standard
Navigation System:
Standard
Power outlet:
Standard
Roadside assistance:
Standard
Satellite radio:
Standard
Trailer Hitch:
Standard
Voice Recognition:
Standard
Wifi:
Standard
Adaptive Cruise Control:
Available
Cooled/Ventilated Seats:
Available
Parking Sensors:
Available
Wireless Smartphone Charging:
Available
Air Suspension:
N/A
Automatic Parking:
N/A
Captain's seat:
N/A
Internet Radio:
N/A
Massage Seats:
N/A
Paddle Shifters:
N/A
Panoramic Sunroof/Moonroof
N/A
Power Lift Gate:
N/A
Quad Seats:
N/A
Roof Rack:
N/A
Sunroof/Moonroof:
N/A
Standard/Optional Features
Alloy wheels:
Standard
Android Auto:
Standard
Apple CarPlay:
Standard
Bench Seats:
Standard
Bluetooth:
Standard
Front Bench Seats:
N/A
Heated Seats
Standard
Heated Steering Wheel:
Standard
Keyless Entry:
Standard
Keyless Ignition:
Standard
Leather Upholstery:
Standard
Navigation System:
Standard
Power outlet:
Standard
Roadside assistance:
Standard
Satellite radio:
Standard
Trailer Hitch:
Standard
Voice Recognition:
Standard
Wifi:
Standard
Adaptive Cruise Control:
Available
Cooled/Ventilated Seats:
Standard
Parking Sensors:
Available
Wireless Smartphone Charging:
Available
Air Suspension:
N/A
Automatic Parking:
N/A
Captain's seat:
N/A
Internet Radio:
N/A
Massage Seats:
N/A
Paddle Shifters:
N/A
Panoramic Sunroof/Moonroof
N/A
Power Lift Gate:
N/A
Quad Seats:
N/A
Roof Rack:
N/A
Sunroof/Moonroof:
N/A
Safety Features
Backup camera:
Standard
Rear Seat Reminder:
Standard
360-Degree Camera:
N/A
Blind Spot Monitoring:
N/A
Driver Attention Monitoring:
N/A
Forward Collision Warning:
N/A
Lane Departure Warning:
N/A
Lane Keeping Assist:
N/A
Pedestrian Detection:
N/A
Rear Cross-Traffic Alert:
N/A
Safety Features
Backup camera:
Standard
Rear Seat Reminder:
Standard
360-Degree Camera:
N/A
Blind Spot Monitoring:
N/A
Driver Attention Monitoring:
N/A
Forward Collision Warning:
N/A
Lane Departure Warning:
N/A
Lane Keeping Assist:
N/A
Pedestrian Detection:
N/A
Rear Cross-Traffic Alert:
N/A
Interior Dimensions
Front Head Room:
43 inches
Front Leg Room:
44.5 inches
Front Shoulder Room:
66 inches
Rear Head Room:
39.9 inches
Rear Leg Room:
35.2 inches
Rear Shoulder Room:
64.9 inches
Cargo Space:
Not yet available
Overall Interior Volume:
Not yet available
Interior Dimensions
Front Head Room:
43 inches
Front Leg Room:
44.5 inches
Front Shoulder Room:
66 inches
Rear Head Room:
39.9 inches
Rear Leg Room:
35.2 inches
Rear Shoulder Room:
64.9 inches
Cargo Space:
Not yet available
Overall Interior Volume:
Not yet available
Exterior Dimensions
Curb Weight:
4810 lbs
Width:
81.2 inches
Height:
75.6 inches
Length:
231.8 inches
Wheelbase:
147.4 inches
Ground Clearance:
7.9 inches
Exterior Dimensions
Curb Weight:
5150 lbs
Width:
81.2 inches
Height:
78.5 inches
Length:
231.8 inches
Wheelbase:
147.5 inches
Ground Clearance:
10.9 inches
Standard Wheel/Tire Information
Wheel Size:
18.0 x 8.5 inches
Wheel Type:
aluminum alloy with painted accents
Tire Size:
265/65R18
Standard Wheel/Tire Information
Wheel Size:
18.0 x 8.5 inches
Wheel Type:
aluminum alloy with painted accents
Tire Size:
265/65R18
