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2021 GMC Sierra 1500 Specs - Exterior and Interior Dimensions
| Body | Regular Cab 8ft bed | Extended Cab 6.5ft bed | Crew Cab 6ft bed | Crew Cab 6.5ft bed |
| Wheelbase | 3,546 mm | 3,744 mm | 3,744 mm | 3,988 mm |
| Length | 5,832 mm | 5,888 mm | 5,885 mm | 6,129 mm |
| Width | 2,062 mm | 2,062 mm | 2,062 mm | 2,062 mm |
| Height | 1,920 mm | 1,920 mm | 1,918 mm | 1,915 mm |
| Curb Weight | 2,050 kg | 2,141 kg | 2,141 kg | 2,177 kg |
| Fuel Capacity | 106 L | 91 L | 91 L | 91 L |
| Headroom, Row 1 | 1,095 mm | 1,092 mm | 1,092 mm | 1,092 mm |
| Shoulder Room, Row 1 | 1,679 mm | 1,676 mm | 1,676 mm | 1,676 mm |
| Hip Room, Row 1 | 1,547 mm | 1,554 mm | 1,554 mm | 1,554 mm |
| Legroom, Row 1 | 1,130 mm | 1,130 mm | 1,130 mm | 1,130 mm |
| Headroom, Row 2 | 0 mm | 1,013 mm | 1,019 mm | 1,019 mm |
| Shoulder Room, Row 2 | 0 mm | 1,648 mm | 1,656 mm | 1,656 mm |
| Hip Room, Row 2 | 0 mm | 1,529 mm | 1,529 mm | 1,529 mm |
| Legroom, Row 2 | 0 mm | 894 mm | 1,102 mm | 1,102 mm |
| Total Legroom | 1,130 mm (over 1 row) | 2,024 mm (over 2 rows) | 2,233 mm (over 2 rows) | 2,233 mm (over 2 rows) |
What Our Members Are Saying about the Seat Room and Comfort of the 2021 GMC Sierra 1500
None of our members have yet commented on the seat room and comfort of the 2021 GMC Sierra 1500.
2021 GMC Sierra 1500 Regular Cab 8ft bed Specs - Powertrains and Tire Sizes
| Trim | Base |
| Standard Engine | 4.3L V6 OHV-2v 285 hp@5300 305 lb-ft@3900 |
| Optional Engine(s) | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 |
| Standard Transmission | 6-speed manually-shiftable automatic |
| Standard Drivetrain | RWD |
| Optional Drivetrain(s) | 4WD w/low range |
| 4WD | |
| Standard Tires | 255/70R17 tires |
| Optional Tires | 265/70R17 tires |
2021 GMC Sierra 1500 Extended Cab 6.5ft bed Specs - Powertrains and Tire Sizes
| Trim | Base | SLE | Elevation |
| Standard Engine | 4.3L V6 OHV-2v 285 hp@5300 305 lb-ft@3900 | turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 | turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 |
| Optional Engine(s) | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 |
| turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | |
| Standard Transmission | 6-speed manually-shiftable automatic | 8-speed manually-shiftable automatic | 8-speed manually-shiftable automatic |
| Optional Transmission(s) | 8-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | 10-speed manually-shiftable automatic |
| Standard Drivetrain | RWD | RWD | RWD |
| Optional Drivetrain(s) | 4WD w/low range | 4WD w/low range | 4WD w/low range |
| 4WD | 4WD | 4WD | |
| Standard Tires | 255/70R17 tires | 255/70R17 tires | 275/60R20 tires |
| Optional Tires | 265/70R17 tires | 265/70R17 tires | |
| 265/65R18 tires | |||
| 275/60R20 tires |
2021 GMC Sierra 1500 Crew Cab 6ft bed Specs - Powertrains and Tire Sizes
| Trim | Base | SLE | Elevation | SLT | AT4 | Denali |
| Standard Engine | 4.3L V6 OHV-2v 285 hp@5300 305 lb-ft@3900 | turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 | turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 |
| Optional Engine(s) | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 6.2L V8 OHV-2v 420 hp@5600 460 lb-ft@4100 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | 6.2L V8 OHV-2v 420 hp@5600 460 lb-ft@4100 |
| turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | 6.2L V8 OHV-2v 420 hp@5600 460 lb-ft@4100 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | |
| Standard Transmission | 6-speed manually-shiftable automatic | 8-speed manually-shiftable automatic | 8-speed manually-shiftable automatic | 8-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | 8-speed manually-shiftable automatic |
| Optional Transmission(s) | 8-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | |
| Standard Drivetrain | RWD | RWD | RWD | RWD | 4WD w/low range | RWD |
| Optional Drivetrain(s) | 4WD w/low range | 4WD w/low range | 4WD w/low range | 4WD | 4WD w/low range | |
| 4WD | 4WD | 4WD | 4WD w/low range | |||
| Standard Tires | 255/70R17 tires | 255/70R17 tires | 275/60R20 tires | 265/65R18 tires | 265/65R18 tires | 275/60R20 tires |
| Optional Tires | 265/70R17 tires | 265/70R17 tires | 275/60R20 tires | 275/60R20 tires | 275/50R22 tires | |
| 265/65R18 tires | 275/65R18 tires | |||||
| 275/60R20 tires |
2021 GMC Sierra 1500 Crew Cab 6.5ft bed Specs - Powertrains and Tire Sizes
| Trim | Base | SLE | Elevation | SLT | AT4 | Denali |
| Standard Engine | 4.3L V6 OHV-2v 285 hp@5300 305 lb-ft@3900 | turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 | turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 |
| Optional Engine(s) | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 5.3L V8 OHV-2v 355 hp@5600 383 lb-ft@4100 | 6.2L V8 OHV-2v 420 hp@5600 460 lb-ft@4100 | 6.2L V8 OHV-2v 420 hp@5600 460 lb-ft@4100 | 6.2L V8 OHV-2v 420 hp@5600 460 lb-ft@4100 |
| turbocharged 2.7L I4 DOHC-4v 310 hp@5600 348 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | turbocharged 3.0L V6 Diesel DOHC-4v 277 hp@3750 460 lb-ft@1500 | ||
| Standard Transmission | 6-speed manually-shiftable automatic | 8-speed manually-shiftable automatic | 8-speed manually-shiftable automatic | 8-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | 10-speed manually-shiftable automatic |
| Optional Transmission(s) | 8-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | 10-speed manually-shiftable automatic | ||
| Standard Drivetrain | 4WD | 4WD | 4WD | 4WD | 4WD w/low range | 4WD w/low range |
| Optional Drivetrain(s) | 4WD w/low range | 4WD w/low range | 4WD w/low range | 4WD w/low range | ||
| Standard Tires | 255/70R17 tires | 255/70R17 tires | 275/60R20 tires | 265/65R18 tires | 265/65R18 tires | 275/60R20 tires |
| Optional Tires | 265/70R17 tires | 265/70R17 tires | 275/60R20 tires | 275/60R20 tires | 275/50R22 tires | |
| 265/65R18 tires | 275/65R18 tires | |||||
| 275/60R20 tires |
What Our Members Are Saying about the Powertrain of the 2021 GMC Sierra 1500
None of our members have yet commented on the powertrain of the 2021 GMC Sierra 1500.
What Our Members Are Saying about the Tires of the 2021 GMC Sierra 1500
None of our members have yet commented on the tires of the 2021 GMC Sierra 1500.
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