| 1 | 0 | 3 | 4 | 3 | 4 |
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 | 139.6 in | 147.4 in | 147.4 in | 157.0 in |
| Length | 229.6 in | 231.8 in | 231.7 in | 241.3 in |
| Width | 81.2 in | 81.2 in | 81.2 in | 81.2 in |
| Height | 75.6 in | 75.6 in | 75.5 in | 75.4 in |
| Curb Weight | 4520 lb. | 4720 lb. | 4720 lb. | 4800 lb. |
| Fuel Capacity | 28.0 gal. | 24.0 gal. | 24.0 gal. | 24.0 gal. |
| Headroom, Row 1 | 43.1 in | 43.0 in | 43.0 in | 43.0 in |
| Shoulder Room, Row 1 | 66.1 in | 66.0 in | 66.0 in | 66.0 in |
| Hip Room, Row 1 | 60.9 in | 61.2 in | 61.2 in | 61.2 in |
| Legroom, Row 1 | 44.5 in | 44.5 in | 44.5 in | 44.5 in |
| Headroom, Row 2 | 0.0 in | 39.9 in | 40.1 in | 40.1 in |
| Shoulder Room, Row 2 | 0.0 in | 64.9 in | 65.2 in | 65.2 in |
| Hip Room, Row 2 | 0.0 in | 60.2 in | 60.2 in | 60.2 in |
| Legroom, Row 2 | 0.0 in | 35.2 in | 43.4 in | 43.4 in |
| Total Legroom | 44.5 in (over 1 rows) | 79.7 in (over 2 rows) | 87.9 in (over 2 rows) | 87.9 in (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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