Specs

Research 2021 GMC Sierra 3500HD specs for the trims available. Choose the desired trim / style from the dropdown list to see the corresponding specs.

Regular Cab Long Box 2-Wheel Drive

Brakes

Brake Type Pwr
Drum - Rear (Yes or )
Rear Drum Diam x Width (in)
Rear Brake Rotor Diam x Thickness (in) 14.1 x 1.3
Rear Brake Rotor Diam x Thickness (in) 14 x 1.6
Front Brake Rotor Diam x Thickness (in) 14 x 1.6
Disc - Rear (Yes or ) Yes
Disc - Front (Yes or ) Yes
Brake ABS System (Second Line)
Brake ABS System 4-Wheel

Cargo Area Dimensions

Tailgate Width (in)
Cargo Box Width @ Top, Rear (in) - TBD -
Cargo Box Width @ Top, Rear (in)
Cargo Box Length @ Floor (in) 98.27
Cargo Box Length @ Floor (in)
Ext'd Cab Cargo Volume (ft³) - TBD -
Cargo Volume (ft³) 83.5
Cargo Volume (ft³)
Tailgate Width (in) - TBD -
Cargo Box (Area) Height (in) 21
Cargo Box (Area) Height (in)
Cargo Box Width @ Wheelhousings (in) 50.55
Cargo Box Width @ Wheelhousings (in)
Cargo Box Width @ Floor (in) 71.4
Cargo Box Width @ Floor (in)

Cooling System

Total Cooling System Capacity (qts) - TBD -

Electrical

Cold Cranking Amps @ 0° F (Primary) 720
Maximum Alternator Capacity (amps) 170 & 220
Maximum Alternator Capacity (amps) 220
Cold Cranking Amps @ 0° F (Primary) 730
Cold Cranking Amps @ 0° F (2nd) 730
Cold Cranking Amps @ 0° F (2nd)
Maximum Alternator Watts
Maximum Alternator Capacity (amps) 170

Emissions

Tons/yr of CO2 Emissions @ 15K mi/year

Engine

Engine Order Code L5P
Engine Oil Cooler Yes
Engine Type Gas/Ethanol V8
Engine Order Code L8T
SAE Net Torque @ RPM 464 @ 4000
SAE Net Torque @ RPM 910 @ 1600
SAE Net Horsepower @ RPM 401 @ 5200
SAE Net Horsepower @ RPM 445 @ 2800
Fuel System Direct Injection
Displacement 6.6L/- TBD -
Engine Type Gas V8
Engine Type Turbocharged Diesel V8

Exterior Dimensions

Ground Clearance, Rear (in) 10.47
Ground Clearance, Rear (in) 11.22
Ground Clearance, Front (in) 11.22
Ground Clearance, Front (in) 10.47
Frame Width, Rear (in) - TBD -
Ground to Top of Frame (in) - TBD -
Ground to Top of Load Floor (in) - TBD -
Ground to Top of Load Floor (in)
Cab to End of Frame (in) - TBD -
Cab to Axle (in) 55.2
Front Bumper to Back of Cab (in) - TBD -
Overhang, Rear w/o bumper (in) - TBD -
Overhang, Front (in) - TBD -
Height, Overall (in) 80.94
Height, Overall (in) 80.24
Width, Max w/o mirrors (in) 81.75
Width, Max w/o mirrors (in) 96.75
Length, Overall (in) 235.5
Length, Overall (in) - TBD -
Wheelbase (in) 141.55

Frame

Frame Type Hydroformed

Fuel Tank

Aux Fuel Tank Capacity, Approx (gal)
Fuel Tank Location - TBD -
Aux Fuel Tank Location
Fuel Tank Capacity, Approx (gal) 36
Fuel Tank Capacity, Approx (gal) 28

Interior Dimensions

Front Leg Room (in) 44.53
Front Head Room (in) 43.11
Front Hip Room (in) 60.9
Front Shoulder Room (in) 66.06
Passenger Capacity 2
Passenger Capacity 3

Mileage

EPA Fuel Economy Est - Hwy (MPG)
EPA Fuel Economy Est - City (MPG)
Fuel Economy Est-Combined (MPG)

Steering

Steering Type Pwr Recirculating Ball
Steering Ratio (:1), On Center - TBD -
Steering Ratio (:1), At Lock N/A
Turning Diameter - Curb to Curb (ft) 46.9
Turning Diameter - Wall to Wall (ft) N/A

Summary

Body Code ZW9
Body Style Regular Cab Pickup
Body Style Regular Cab Chassis Cab
Vehicle Name GMC Sierra 3500HD
Body Code E63

Suspension

Axle Type - Front Independent
Axle Type - Rear - TBD -
Axle Capacity - Front (lbs) - TBD -
Axle Capacity - Rear (lbs) - TBD -
Stabilizer Bar Diameter - Front (in) 1.38
Stabilizer Bar Diameter - Rear (in)
Shock Absorber Diameter - Rear (mm) 51
Shock Absorber Diameter - Front (mm) 51
Axle Ratio (:1) - Rear 3.73
Axle Ratio (:1) - Front
Axle Ratio (:1) - Rear 3.42
Suspension Type - Front Independent
Suspension Type - Rear Multi-Leaf
Spring Capacity - Front (lbs) - TBD -
Spring Capacity - Rear (lbs) - TBD -

Tires

Revolutions/Mile @ 45 mph - Rear
Front Tire Order Code QZT
Front Tire Order Code QQO
Front Tire Order Code QF9
Front Tire Order Code QF6
Rear Tire Order Code QZT
Rear Tire Order Code QQO
Rear Tire Order Code QF9
Rear Tire Order Code QF6
Spare Tire Order Code
Spare Tire Order Code
Spare Tire Order Code ZQO
Spare Tire Order Code ZZT
Spare Tire Order Code ZYG
Front Tire Size LT235/80R17
Front Tire Size LT275/65R20
Front Tire Size LT275/70R18
Rear Tire Size LT235/80R17
Rear Tire Size LT275/65R20
Rear Tire Size LT275/70R18
Spare Tire Size
Spare Tire Size
Spare Tire Size LT235/80R17
Spare Tire Size LT275/70R18
Front Tire Capacity (lbs) 2680
Front Tire Capacity (lbs) 2515
Front Tire Capacity (lbs) 3020
Rear Tire Capacity (lbs) 2833
Rear Tire Capacity (lbs) 3748
Rear Tire Capacity (lbs) 3638
Spare Tire Capacity (lbs)
Spare Tire Capacity (lbs)
Spare Tire Capacity (lbs) 2833
Spare Tire Capacity (lbs) 3638
Revolutions/Mile @ 45 mph - Front
Revolutions/Mile @ 45 mph - Spare

Trailering

Wt Distributing Hitch - Max Tongue Wt. (lbs) 1680
Wt Distributing Hitch - Max Tongue Wt. (lbs) 1450
Fifth Wheel Hitch - Max Trailer Wt. (lbs) 36000
Fifth Wheel Hitch - Max Trailer Wt. (lbs) 32000
Fifth Wheel Hitch - Max Trailer Wt. (lbs) 16800
Fifth Wheel Hitch - Max Trailer Wt. (lbs) 21500
Fifth Wheel Hitch - Max Trailer Wt. (lbs) 17200
Fifth Wheel Hitch - Max Tongue Wt. (lbs) 9000
Fifth Wheel Hitch - Max Tongue Wt. (lbs) 8000
Fifth Wheel Hitch - Max Tongue Wt. (lbs) 4200
Fifth Wheel Hitch - Max Tongue Wt. (lbs) 5375
Fifth Wheel Hitch - Max Tongue Wt. (lbs) 4300
Maximum Trailering Capacity (lbs) 20000
Dead Weight Hitch - Max Trailer Wt. (lbs) 5000
Dead Weight Hitch - Max Tongue Wt. (lbs) 500
Wt Distributing Hitch - Max Trailer Wt. (lbs) 20000
Wt Distributing Hitch - Max Trailer Wt. (lbs) 16800
Wt Distributing Hitch - Max Trailer Wt. (lbs) 14500
Wt Distributing Hitch - Max Tongue Wt. (lbs) 2000

Transmission

Second Gear Ratio (:1) 2.36
Second Gear Ratio (:1) 2.87
First Gear Ratio (:1) 4.03
First Gear Ratio (:1) 4.54
Trans Description Cont. Again
Trans Description Cont. Automatic
Trans Type 6
Trans Type 10
Trans Order Code MYD
Trans Order Code MGM
Trans Order Code MGU
Eighth Gear Ratio (:1)
Ninth Gear Ratio (:1)
Tenth Gear Ratio (:1) 0.63
Trans PTO Access
Tenth Gear Ratio (:1)
Trans PTO Access - TBD -
Trans Power Take Off
Trans Power Take Off Yes
Clutch Size (in)
Reverse Ratio (:1) 3.06
Reverse Ratio (:1) 4.54
Sixth Gear Ratio (:1) 0.67
Sixth Gear Ratio (:1) 1.26
Fifth Gear Ratio (:1) 0.85
Fifth Gear Ratio (:1) 1.48
Fourth Gear Ratio (:1) 1.15
Fourth Gear Ratio (:1) 1.72
Third Gear Ratio (:1) 1.53
Third Gear Ratio (:1) 2.06
Transfer Case Power Take Off
Transfer Case Gear Ratio (:1), Low
Transfer Case Gear Ratio (:1), High
Transfer Case Model
Drivetrain Rear Wheel Drive
Seventh Gear Ratio (:1) 1.00
Seventh Gear Ratio (:1)
Eighth Gear Ratio (:1) 0.85
Ninth Gear Ratio (:1) 0.69

Weight Information

Gross Axle Wt Rating - Front (lbs) 4400
Gross Axle Wt Rating - Front (lbs) 5200
Gross Combined Wt Rating (lbs) 24000
Gross Combined Wt Rating (lbs) 29700
Gross Combined Wt Rating (lbs) 43500
Gross Combined Wt Rating (lbs) 43900
Gross Vehicle Weight Rating Cap (lbs) 10750
Gross Vehicle Weight Rating Cap (lbs) 11500
Gross Vehicle Weight Rating Cap (lbs) 14000
Curb Weight - Rear (lbs) 2899
Curb Weight - Front (lbs) 3440
Gross Axle Wt Rating - Rear (lbs) 7250
Gross Axle Wt Rating - Rear (lbs) 10500
Gross Axle Wt Rating - Front (lbs) 4800

Wheels

Rear Wheel Material Aluminum
Front Wheel Material Steel
Front Wheel Material Aluminum
Spare Wheel Material Steel
Spare Wheel Material
Spare Wheel Material
Rear Wheel Material Steel
Spare Wheel Size (in) 18 x 8
Spare Wheel Size (in) 17 x 6.5
Spare Wheel Size (in)
Spare Wheel Size (in)
Rear Wheel Size (in) 18 x 8
Rear Wheel Size (in) 17 x 6.5
Rear Wheel Size (in) 20 x 8.5
Rear Wheel Size (in) 20 x - TBD -
Front Wheel Size (in) 18 x 8
Front Wheel Size (in) 17 x 6.5
Front Wheel Size (in) 20 x 8.5
Front Wheel Size (in) 20 x - TBD -