Specs

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

2WD Reg Cab 146" WB, 60" CA

Brakes

Disc - Rear (Yes or ) Yes
Front Brake Rotor Diam x Thickness (in) 13 x 1.18
Rear Brake Rotor Diam x Thickness (in) 13.6 x 0.79
Drum - Rear (Yes or )
Rear Drum Diam x Width (in)
Disc - Front (Yes or ) Yes
Brake Type Pwr
Brake ABS System 4-Wheel
Brake ABS System (Second Line)

Cooling System

Total Cooling System Capacity (qts) - TBD -

Electrical

Maximum Alternator Capacity (amps) 170
Maximum Alternator Capacity (amps) 220
Cold Cranking Amps @ 0° F (2nd)
Cold Cranking Amps @ 0° F (Primary) 720
Cold Cranking Amps @ 0° F (Primary) 730
Cold Cranking Amps @ 0° F (2nd) 730
Maximum Alternator Watts - TBD -
Maximum Alternator Capacity (amps) 390

Emissions

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

Engine

SAE Net Horsepower @ RPM 445 @ 2800
SAE Net Torque @ RPM 910 @ 1600
SAE Net Torque @ RPM 464 @ 4000
Engine Oil Cooler Yes
Engine Order Code L5P
Engine Order Code L8T
Engine Type Turbocharged Diesel V8
Engine Type Gas V8
Displacement 6.6L/403
Displacement 6.6L/400
Fuel System Direct Injection
SAE Net Horsepower @ RPM 401 @ 5200

Exterior Dimensions

Length, Overall (in) 239.84
Ground Clearance, Rear (in) 8.15
Ground Clearance, Front (in) 8.15
Frame Width, Rear (in) 89.15
Frame Width, Rear (in) 95.42
Ground to Top of Frame (in) - TBD -
Ground to Top of Load Floor (in)
Cab to End of Frame (in) - TBD -
Cab to Axle (in) 60
Front Bumper to Back of Cab (in) 126.65
Overhang, Rear w/o bumper (in) - TBD -
Overhang, Front (in) - TBD -
Height, Overall (in) 80.1
Width, Max w/o mirrors (in) 80.84
Wheelbase (in) 146.3

Frame

Frame Type Hydroformed

Fuel Tank

Fuel Tank Capacity, Approx (gal) 40
Fuel Tank Capacity, Approx (gal) 63
Aux Fuel Tank Capacity, Approx (gal)
Fuel Tank Capacity, Approx (gal) 23
Fuel Tank Location Front
Fuel Tank Location Front & Rear
Aux Fuel Tank Location
Fuel Tank Location Rear

Interior Dimensions

Front Shoulder Room (in) 66.02
Front Head Room (in) 43.11
Front Leg Room (in) 44.53
Front Hip Room (in) 61
Passenger Capacity 3

Mileage

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

Steering

Steering Ratio (:1), At Lock - TBD -
Turning Diameter - Wall to Wall (ft) - TBD -
Turning Diameter - Curb to Curb (ft) 57.5
Steering Type Pwr Recirculating Ball
Steering Ratio (:1), On Center - TBD -

Summary

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

Suspension

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

Tires

Spare Tire Capacity (lbs) 2833
Front Tire Order Code QZT
Front Tire Order Code QQO
Rear Tire Order Code QZT
Rear Tire Order Code QQO
Spare Tire Order Code ZQO
Spare Tire Order Code ZZT
Spare Tire Order Code
Front Tire Size LT235/80R17E
Rear Tire Size LT235/80R17E
Spare Tire Size LT235/80R17E
Spare Tire Size
Front Tire Capacity (lbs) 2680
Front Tire Capacity (lbs) 2515
Rear Tire Capacity (lbs) 2833
Spare Tire Capacity (lbs)
Revolutions/Mile @ 45 mph - Front - TBD -
Revolutions/Mile @ 45 mph - Rear - TBD -
Revolutions/Mile @ 45 mph - Spare - TBD -
Revolutions/Mile @ 45 mph - Spare

Trailering

Dead Weight Hitch - Max Tongue Wt. (lbs)
Wt Distributing Hitch - Max Trailer Wt. (lbs)
Wt Distributing Hitch - Max Tongue Wt. (lbs)
Fifth Wheel Hitch - Max Trailer Wt. (lbs)
Fifth Wheel Hitch - Max Tongue Wt. (lbs)
Dead Weight Hitch - Max Trailer Wt. (lbs)

Transmission

Trans PTO Access
Ninth Gear Ratio (:1) 0.68
Ninth Gear Ratio (:1)
Tenth Gear Ratio (:1) 0.63
Tenth Gear Ratio (:1)
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 MGU
Trans Order Code MGM
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
Eighth 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
Second Gear Ratio (:1) 2.36
Second Gear Ratio (:1) 2.866
First Gear Ratio (:1) 4.03

Weight Information

Gross Vehicle Weight Rating Cap (lbs) 14000
Curb Weight - Rear (lbs) 2540
Curb Weight - Front (lbs) 3512
Gross Axle Wt Rating - Front (lbs) 4400
Gross Axle Wt Rating - Front (lbs) 4800
Gross Axle Wt Rating - Front (lbs) 5200
Gross Axle Wt Rating - Rear (lbs) 10500
Gross Combined Wt Rating (lbs) 24000
Gross Combined Wt Rating (lbs) 40000

Wheels

Rear Wheel Size (in) 17 x - TBD -
Spare Wheel Material
Front Wheel Size (in) 17 x - TBD -
Rear Wheel Material Steel
Front Wheel Material Steel
Spare Wheel Size (in)
Spare Wheel Size (in) 17 x 6.5
Spare Wheel Material Steel