Specs

Research 1998 GMC Suburban specs for the trims available. Choose the desired trim / style from the dropdown list to see the corresponding specs.

1500

Brakes

Brake ABS System 4-Wheel
Drum - Rear (Yes or ) Yes
Rear Brake Rotor Diam x Thickness (in)
Front Brake Rotor Diam x Thickness (in) 11.57 x 1.25
Disc - Rear (Yes or )
Disc - Front (Yes or ) Yes
Brake ABS System (Second Line)
Rear Drum Diam x Width (in) 11.15 x 2.75
Brake Type Power

Cargo Area Dimensions

Cargo Box Width @ Wheelhousings (in) 49.7
Cargo Volume to Seat 3 (ft³) 47.5
Cargo Volume to Seat 4 (ft³)
Cargo Area Length @ Floor to Console (in)
Cargo Area Length @ Floor to Seat 1 (in) 97.7
Cargo Area Length @ Floor to Seat 2 (in) 70.9
Cargo Area Length @ Floor to Seat 3 (in) 36.0
Cargo Area Length @ Floor to Seat 4 (in)
Cargo Area Width @ Beltline (in) 77.0
Cargo Box (Area) Height (in) 40.8
Cargo Volume to Seat 1 (ft³) 149.5
Cargo Volume to Seat 2 (ft³) 96.6

Cooling System

Total Cooling System Capacity (qts) 23.2
Total Cooling System Capacity (qts) 24.8
Total Cooling System Capacity (qts) 17.4

Doors

Side Door Type

Electrical

Maximum Alternator Capacity (amps) 140
Maximum Alternator Capacity (amps) 105
Cold Cranking Amps @ 0° F (2nd)
Cold Cranking Amps @ 0° F (2nd) 600
Cold Cranking Amps @ 0° F (Primary) 600
Maximum Alternator Watts 1680
Maximum Alternator Watts 1200
Maximum Alternator Capacity (amps) 100
Maximum Alternator Watts 1260

Engine

Engine Type Gas V8
Displacement 7.4L/454
Displacement 6.5L/395
Displacement 5.7L/350
Engine Oil Cooler
Fuel System EFI
Engine Oil Cooler Yes
Fuel System SFI
SAE Net Horsepower @ RPM 290 @ 4000
SAE Net Horsepower @ RPM 195 @ 3400
SAE Net Horsepower @ RPM 255 @ 4600
SAE Net Torque @ RPM 410 @ 3200
SAE Net Torque @ RPM 430 @ 1800
SAE Net Torque @ RPM 330 @ 2800
Engine Order Code L29
Engine Order Code L65
Engine Order Code L31
Engine Type Turbo Diesel V8

Exterior Dimensions

Side Door Opening Height (in)
Step Up Height - Side (in)
Step Up Height - Front (in)
Side Door Opening Width (in)
Rear Door Opening Width (in) 50.5
Rear Door Opening Width (in) 61.4
Rear Door Opening Height (in) 40.9
Rear Door Opening Height (in) 34.1
Ground Clearance, Rear (in) 6.6
Ground Clearance, Front (in) 7.1
Ground to Top of Load Floor (in) 29.2
Overhang, Rear w/bumper (in) 52.6
Overhang, Front (in) 35.4
Height, Overall (in) 71.3
Width, Max w/o mirrors (in) 76.7
Length, Overall w/rear bumper (in) 220.0
Wheelbase (in) 131.5

Frame

Frame Type Ladder

Fuel Tank

Aux Fuel Tank Location
Fuel Tank Location Behind Rear Axle
Aux Fuel Tank Capacity, Approx (gal)
Fuel Tank Capacity, Approx (gal) 42

Interior Dimensions

Second Hip Room (in) 60.3
Second Hip Room (in)
Third Head Room (in) 37.9
Third Head Room (in)
Third Leg Room (in) 37.2
Second Shoulder Room (in)
Third Shoulder Room (in) 64.3
Third Shoulder Room (in)
Third Hip Room (in) 48.5
Third Hip Room (in)
Third Leg Room (in)
Second Shoulder Room (in) 65.0
Second Leg Room (in)
Second Leg Room (in) 36.2
Second Head Room (in)
Passenger Capacity 8
Passenger Capacity 5
Passenger Capacity 9
Passenger Capacity 6
Passenger Capacity 3
Front Head Room (in) 39.9
Front Leg Room (in) 41.3
Front Shoulder Room (in) 65.0
Front Hip Room (in) 60.5
Second Head Room (in) 38.9

Mileage

EPA Fuel Economy Est - City (MPG) 14
EPA Fuel Economy Est - City (MPG) 15
EPA Fuel Economy Est - Hwy (MPG) 19
EPA Fuel Economy Est - Hwy (MPG) 18

Steering

Turning Diameter - Wall to Wall (ft) 48.1
Steering Ratio (:1), On Center 16.5
Steering Type Pwr Speed-Sensitive
Turning Diameter - Curb to Curb (ft) 43.7
Steering Ratio (:1), At Lock 15.6

Summary

Body Code ZW9
Body Code E55
Body Style 1500
Vehicle Name GMC Suburban

Suspension

Stabilizer Bar Diameter - Front (in) 1.25
Suspension Type - Front Indep Coil Spring
Suspension Type - Rear 2-Stage Multi-Leaf
Spring Capacity - Front (lbs) 3400
Spring Capacity - Front (lbs) 3600
Spring Capacity - Front (lbs) 3800
Spring Capacity - Front (lbs) 2950
Spring Capacity - Rear (lbs) 6084
Spring Capacity - Rear (lbs) 4000
Axle Type - Front Independent
Axle Type - Rear Full-Floating
Axle Type - Rear Semi-Floating
Axle Capacity - Front (lbs) 3800
Axle Capacity - Front (lbs) 3400
Axle Capacity - Rear (lbs) 6084
Axle Capacity - Rear (lbs) 4000
Axle Ratio (:1) - Front
Axle Ratio (:1) - Rear 3.73
Axle Ratio (:1) - Rear 3.42
Shock Absorber Diameter - Front (mm) 46
Shock Absorber Diameter - Front (mm) 32
Shock Absorber Diameter - Rear (mm) 46
Shock Absorber Diameter - Rear (mm) 32
Stabilizer Bar Diameter - Rear (in) 0.87

Tires

Front Tire Order Code QHA
Revolutions/Mile @ 45 mph - Front 678
Revolutions/Mile @ 45 mph - Front 721
Revolutions/Mile @ 45 mph - Rear 678
Revolutions/Mile @ 45 mph - Rear 721
Revolutions/Mile @ 45 mph - Spare 678
Revolutions/Mile @ 45 mph - Spare 721
Spare Tire Capacity (lbs) 1763
Spare Tire Order Code QIZ
Spare Tire Order Code QHM
Rear Tire Order Code QHA
Rear Tire Order Code QIZ
Rear Tire Order Code QHM
Front Tire Order Code QIZ
Front Tire Order Code QHM
Spare Tire Capacity (lbs) 2030
Rear Tire Capacity (lbs) 1984
Rear Tire Capacity (lbs) 3042
Front Tire Capacity (lbs) 1763
Front Tire Capacity (lbs) 2030
Spare Tire Size P235/75R15XL
Spare Tire Size LT245/75R16E
Spare Tire Size P235/75R16
Rear Tire Size P235/75R15XL
Rear Tire Size LT245/75R16E
Rear Tire Size P235/75R16
Front Tire Size P235/75R15XL
Front Tire Size LT245/75R16E
Front Tire Size P235/75R16
Spare Tire Order Code QHA

Trailering

Dead Weight Hitch - Max Trailer Wt. (lbs) 5000
Dead Weight Hitch - Max Tongue Wt. (lbs) 500
Wt Distributing Hitch - Max Trailer Wt. (lbs) 6500
Wt Distributing Hitch - Max Tongue Wt. (lbs) 800
Fifth Wheel Hitch - Max Trailer Wt. (lbs) N/A
Fifth Wheel Hitch - Max Tongue Wt. (lbs) N/A

Transmission

Seventh Gear Ratio (:1)
Transfer Case Gear Ratio (:1), Low
Transfer Case Gear Ratio (:1), High
Transfer Case Model
Trans PTO Access
Trans Power Take Off
Clutch Size (in)
Reverse Ratio (:1) 2.29
Reverse Ratio (:1) 2.08
Sixth Gear Ratio (:1)
Fifth Gear Ratio (:1)
Fourth Gear Ratio (:1) 0.70
Fourth Gear Ratio (:1) 0.75
Third Gear Ratio (:1) 1.00
Second Gear Ratio (:1) 1.63
Second Gear Ratio (:1) 1.48
First Gear Ratio (:1) 3.06
First Gear Ratio (:1) 2.48
Trans Description Cont. Again Electronic
Trans Description Cont. Automatic w/OD,
Trans Description Cont. HD Automatic w/OD,
Trans Type 4
Trans Order Code M30
Trans Order Code MT1
Drivetrain Rear Wheel Drive
Transfer Case Power Take Off

Vehicle

Rear Door Type Tailgate
Rear Door Type Panel Doors

Weight Information

Gross Axle Wt Rating - Front (lbs) 3400
Gross Vehicle Weight Rating Cap (lbs) 7700
Curb Weight - Rear (lbs) 2450
Curb Weight - Front (lbs) 2370
Gross Axle Wt Rating - Rear (lbs) 3968
Gross Axle Wt Rating - Rear (lbs) 6084
Gross Axle Wt Rating - Front (lbs) 2950
Gross Axle Wt Rating - Front (lbs) 3600
Gross Axle Wt Rating - Front (lbs) 3800
Gross Combined Wt Rating (lbs) 11,000
Gross Combined Wt Rating (lbs) 12,000
Gross Combined Wt Rating (lbs) 13,000
Gross Combined Wt Rating (lbs) 12,000
Gross Vehicle Weight Rating Cap (lbs) 6800

Wheels

Front Wheel Size (in) 15 x 7.0
Rear Wheel Material Steel
Rear Wheel Material Aluminum
Front Wheel Material Steel
Front Wheel Material Aluminum
Spare Wheel Size (in) 15 x 7.0
Rear Wheel Size (in) 15 x 7.0
Spare Wheel Material Steel

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