GMC Vehicle Models Envoy 1998-2000 Torque Specifications
GMC Vehicle Models Envoy 1998-2000

GMC Vehicle Models Envoy 1998-2000 Torque Specifications

Complete GMC Vehicle Models Envoy 1998-2000 torque specifications guide. Includes factory-specified torque values, torque sequences, and technical specifications for all components including body, brakes, drivetrain, electrical, emissions sensors, fuel, exhaust, HVAC, and suspension. Essential information for proper assembly and maintenance.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

4.3l Engine

Torque specifications for 4.3L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 20 ft-lbs (27 N·m) 2. 25 ft-lbs (34 N·m)
Important Notes
Follow the manufacturer's torque sequence to prevent warping.
2

Valve Cover Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Ensure the gasket is properly seated before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
70 ft-lbs (95 N·m)
Important Notes
Estimated value based on similar engine designs.
2

Connecting Rod Nuts

M10 x 1.25
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Ensure proper bearing clearance before tightening.

Timing System

1

Timing Chain Tensioner Bolt

M8 x 1.25
Torque Specification
19 ft-lbs (26 N·m)
Important Notes
Estimated value based on similar components.
2

Camshaft Sprocket Bolt

M10 x 1.5
Torque Specification
23 ft-lbs (31 N·m)
Important Notes
Ensure the timing marks are aligned before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Follow the specified torque sequence to prevent warping.
2

Exhaust Manifold Bolts

M8 x 1.25
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Ensure the gasket is properly seated before tightening.

Oil System

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the gasket is properly seated before tightening.
2

Oil Drain Plug Bolt

M14 x 1.5
Torque Specification
28 ft-lbs (38 N·m)
Important Notes
Replace the crush washer to ensure a proper seal.

4l60 Transmission

Torque specifications for 4l60 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M10 x 1.5
Torque Specification
32.5 ft-lbs (44 N·m)
Important Notes
Torque value is the midpoint of the specified range (30-35 ft-lbs).

Oil Pan

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is the midpoint of the specified range (10-12 ft-lbs).

Fluid Management

1

Transmission Drain and Fill Plugs

M12 x 1.75
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Torque value is the midpoint of the specified range (15-20 ft-lbs).
2

Transmission Cooler Line Fittings

M14 x 1.5
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Torque value is the midpoint of the specified range (15-20 ft-lbs).

Flywheel And Torque Converter

1

Flywheel Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Torque value is the midpoint of the specified range (75-85 ft-lbs).
2

Torque Converter Bolts

M8 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Torque value is the midpoint of the specified range (35-45 ft-lbs).

Bellhousing

1

Bellhousing Bolts

M10 x 1.5
Torque Specification
32.5 ft-lbs (44 N·m)
Important Notes
Torque value is the midpoint of the specified range (30-35 ft-lbs).

Output Shaft

1

Output Shaft Yoke Nut

M20 x 1.5
Torque Specification
190 ft-lbs (258 N·m)
Important Notes
Torque value is the midpoint of the specified range (180-200 ft-lbs).

Internal Components

1

Valve Body Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is the midpoint of the specified range (10-12 ft-lbs).
2

Transmission Case Bolts

M8 x 1.25
Torque Specification
16.5 ft-lbs (22 N·m)
Important Notes
Torque value is the midpoint of the specified range (15-18 ft-lbs).
3

Shift Shaft Lever Bolt

M8 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is the midpoint of the specified range (20-25 ft-lbs).
4

Transmission Range Sensor Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is the midpoint of the specified range (10-12 ft-lbs).

Body

Torque specifications for Body

Wheels And Hubs

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Critical safety component. Ensure proper torque to prevent wheel detachment.

Fuel System

1

Fuel Tank Strap Bolts

M8 x 1.25
Torque Specification
32.5 ft-lbs (44 N·m)
Important Notes
Estimated value based on typical M8 bolt torque specifications.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Estimated value based on typical M6 bolt torque specifications.

Body Panels

1

Body Panel Bolts

M6 x 1.0
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value based on typical M6 bolt torque specifications.
2

Door Hinge Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Estimated value based on typical M8 bolt torque specifications.

Bumpers

1

Bumper Mounting Bolts

M8 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Estimated value based on typical M8 bolt torque specifications.

Seats

1

Seat Mounting Bolts

M10 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on typical M10 bolt torque specifications.

Radiator Support

1

Radiator Support Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Estimated value based on typical M8 bolt torque specifications.

Roof Rack

1

Roof Rack Mounting Bolts

M6 x 1.0
Torque Specification
12.5 ft-lbs (17 N·m)
Important Notes
Estimated value based on typical M6 bolt torque specifications.

Brakes

Torque specifications for Brakes

Brake Caliper System

1

Brake Caliper Bolts

M10 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Estimated value based on typical M10 bolt torque for brake calipers.
2

Brake Caliper Mounting Bracket Bolts

M12 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Estimated value based on typical M12 bolt torque for heavy-duty applications.
3

Brake Hose Banjo Bolt

M10 x 1.0
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Estimated value based on typical M10 banjo bolt torque for brake systems.

Brake Rotor Drum System

1

Brake Disc/Drum Retaining Bolts

M8 x 1.25
Torque Specification
27.5 ft-lbs (37.5 N·m)
Important Notes
Estimated value based on typical M8 bolt torque for brake rotor/drum applications.

Brake Hydraulic System

1

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (23.5 N·m)
Important Notes
Estimated value based on typical M8 bolt torque for master cylinder applications.
2

Brake Booster Mounting Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (23.5 N·m)
Important Notes
Estimated value based on typical M8 bolt torque for brake booster applications.
3

Brake Line Fittings

M10 x 1.0
Torque Specification
17.5 ft-lbs (23.5 N·m)
Important Notes
Estimated value based on typical M10 brake line fitting torque.
4

ABS Module Mounting Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (23.5 N·m)
Important Notes
Estimated value based on typical M8 bolt torque for ABS module applications.

Wheel Attachment System

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Always use a star pattern when tightening wheel lug nuts.

Drivetrain

Torque specifications for Drivetrain

Engine Transmission Interface

1

Flywheel Bolts

M12 x 1.5
Torque Specification
80 ft-lbs (108 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to avoid warping the flywheel.
2

Transmission Bellhousing Bolts

M10 x 1.25
Torque Specification
55 ft-lbs (75 N·m)
Important Notes
Estimated value based on similar bolt sizes and applications.

Transmission Mounting

1

Transmission Mounting Bolts

M8 x 1.25
Torque Specification
32 ft-lbs (43 N·m)
Important Notes
Ensure the transmission is properly aligned before tightening.

Transmission Fluid System

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Tighten bolts in a crisscross pattern to avoid warping the pan.
2

Transmission Drain Plug

M12 x 1.75
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the plug is properly seated before tightening.

Drive Axles And Cv Joints

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Ensure the axle is properly seated before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Specification
190 ft-lbs (258 N·m)
Important Notes
Use a torque wrench capable of handling high torque values.

Differential And Transfer Case

1

Differential Cover Bolts

M8 x 1.25
Torque Specification
22 ft-lbs (30 N·m)
Important Notes
Tighten bolts in a crisscross pattern to avoid warping the cover.
2

Transfer Case Drain Plug

M12 x 1.75
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Ensure the plug is properly seated before tightening.

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Bolt

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the ignition coil is properly seated before tightening.

Starting System

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Ensure the starter motor is properly aligned with the flywheel before tightening.

Charging System

1

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Ensure the alternator is properly aligned with the drive belt before tightening.

Battery System

1

Battery Terminal Nuts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure the battery terminals are clean and free of corrosion before tightening.

Ac System

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
33 ft-lbs (45 N·m)
Important Notes
Ensure the A/C compressor is properly aligned with the drive belt before tightening.

Grounding System

1

Ground Strap Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the grounding surface is clean and free of corrosion before tightening.

Fuse Box

1

Fuse Box Mounting Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the fuse box is properly seated before tightening.

Ecu System

1

ECU/ECM Mounting Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the ECU/ECM is properly seated before tightening.

Wiring Harness

1

Wiring Harness Retaining Bolts

M6 x 1.0
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Ensure the wiring harness is properly routed before tightening.

Lighting System

1

Headlight/Headlamp Mounting Bolts

M8 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure the headlight assembly is properly aligned before tightening.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Bolts

M8 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is an average of the provided range (20-25 ft-lbs).

Exhaust Manifold

1

Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Torque value is an average of the provided range (25-30 ft-lbs). Follow the manufacturer's torque sequence.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is an average of the provided range (20-25 ft-lbs). Follow the manufacturer's torque sequence.

Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Torque value is an average of the provided range (25-30 ft-lbs).
2

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is an average of the provided range (20-25 ft-lbs).

Throttle Body

1

Throttle Body Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is an average of the provided range (10-12 ft-lbs).

Oxygen Sensor

1

Oxygen (O2) Sensor

M18 x 1.5
Torque Specification
35 ft-lbs (47.5 N·m)
Important Notes
Torque value is an average of the provided range (30-40 ft-lbs).

Maf Sensor

1

MAF Sensor Mounting Bolts

M5 x 0.8
Torque Specification
8.5 ft-lbs (11.5 N·m)
Important Notes
Torque value is an average of the provided range (7-10 ft-lbs).

Evap System

1

EVAP Canister Purge Valve Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is an average of the provided range (10-12 ft-lbs).

Heat Shield

1

Catalytic Converter Heat Shield Bolts

M6 x 1.0
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Torque value is an average of the provided range (15-20 ft-lbs).

Exhaust

Torque specifications for Exhaust

Exhaust Manifold

1

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is an average of the provided range (20-25 ft-lbs).
2

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.25
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Torque value is an average of the provided range (25-30 ft-lbs).

Catalytic Converter

1

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is an average of the provided range (20-25 ft-lbs).

Muffler

1

Muffler to Exhaust Pipe Bolts

M10 x 1.25
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Torque value is an average of the provided range (25-30 ft-lbs).

Exhaust Hangers

1

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
17.5 ft-lbs (23.7 N·m)
Important Notes
Torque value is an average of the provided range (15-20 ft-lbs).

Oxygen Sensor

1

Oxygen Sensor (O2 Sensor) Bolts

M12 x 1.25
Torque Specification
32.5 ft-lbs (44.1 N·m)
Important Notes
Torque value is an average of the provided range (30-35 ft-lbs).

Heat Shield

1

Exhaust Heat Shield Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is an average of the provided range (10-12 ft-lbs).

Exhaust Flange

1

Exhaust Flange Bolts

M10 x 1.25
Torque Specification
27.5 ft-lbs (37.3 N·m)
Important Notes
Torque value is an average of the provided range (25-30 ft-lbs).

Fuel

Torque specifications for Fuel

Fuel Rail System

1

Fuel Rail Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque values are based on standard M6 bolt specifications. Ensure bolts are tightened in a crisscross pattern.
2

Fuel Injector Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque values are based on standard M6 bolt specifications. Ensure injectors are properly seated before tightening.

Fuel Delivery System

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque values are based on standard M6 bolt specifications. Ensure the fuel pump is properly aligned before tightening.
2

Fuel Filter Bolt/Nut

M8 x 1.25
Torque Specification
16.5 ft-lbs (22 N·m)
Important Notes
Torque values are based on standard M8 bolt specifications. Ensure the fuel filter is properly seated before tightening.
3

Fuel Line Fittings

M8 x 1.25
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Torque values are based on standard M8 bolt specifications. Ensure fittings are properly aligned and seated before tightening.

Fuel Tank System

1

Fuel Tank Strap Bolts

M10 x 1.5
Torque Specification
32.5 ft-lbs (44 N·m)
Important Notes
Torque values are based on standard M10 bolt specifications. Ensure the fuel tank is properly aligned before tightening.
2

Fuel Filler Neck Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque values are based on standard M6 bolt specifications. Ensure the filler neck is properly aligned before tightening.
3

Fuel Tank Sender Unit Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque values are based on standard M6 bolt specifications. Ensure the sender unit is properly aligned before tightening.

Emissions Control System

1

Fuel Vapor Canister Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque values are based on standard M6 bolt specifications. Ensure the canister is properly aligned before tightening.

Hvac

Torque specifications for Hvac

Ac Compressor

1

A/C Compressor Mounting Bolts

M10 x 1.5
Torque Specification
32.5 ft-lbs (44 N·m)
Important Notes
Torque value is the midpoint of the provided range (30-35 ft-lbs).

Ac Lines

1

A/C Line Fittings

M8 x 1.25
Torque Specification
17.5 ft-lbs (24 N·m)
Important Notes
Torque value is the midpoint of the provided range (15-20 ft-lbs).

Evaporator Core

1

Evaporator Core Housing Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is the midpoint of the provided range (10-12 ft-lbs).

Blower Motor

1

Blower Motor Mounting Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is the midpoint of the provided range (10-12 ft-lbs).

Heater Core

1

Heater Core Housing Bolts

M6 x 1.0
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Torque value is the midpoint of the provided range (10-12 ft-lbs).

Control Panel

1

HVAC Control Panel Mounting Bolts

M5 x 0.8
Torque Specification
8 ft-lbs (11 N·m)
Important Notes
Torque value is the midpoint of the provided range (7-9 ft-lbs).

Condenser

1

Condenser Mounting Bolts

M8 x 1.25
Torque Specification
16.5 ft-lbs (22 N·m)
Important Notes
Torque value is the midpoint of the provided range (15-18 ft-lbs).

Suspension

Torque specifications for Suspension

Strut Shock Absorber

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Torque value is within the range of 45-55 ft-lbs (61-75 Nm).
2

Upper Strut Mount Bolts

M10 x 1.25
Torque Specification
22.5 ft-lbs (30.5 N·m)
Important Notes
Torque value is estimated based on similar components.
3

Lower Shock Absorber Mounting Bolts

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Torque value is within the range of 45-55 ft-lbs (61-75 Nm).

Control Arm

1

Control Arm Bolts

M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Torque value is within the range of 70-80 ft-lbs (95-109 Nm).
2

Ball Joint Nut

M12 x 1.5
Torque Specification
50 ft-lbs (68 N·m)
Important Notes
Torque value is within the range of 45-55 ft-lbs (61-75 Nm).

Steering Components

1

Tie Rod End Nut

M10 x 1.25
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Torque value is within the range of 35-45 ft-lbs (47-61 Nm).
2

Steering Gear/Rack Bolts

M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Torque value is within the range of 70-80 ft-lbs (95-109 Nm).
3

Steering Knuckle Bolts

M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Torque value is within the range of 70-80 ft-lbs (95-109 Nm).

Sway Bar

1

Sway Bar Link Nut

M10 x 1.25
Torque Specification
42.5 ft-lbs (57.5 N·m)
Important Notes
Torque value is within the range of 40-45 ft-lbs (54-61 Nm).
2

Sway Bar Bracket Bolts

M10 x 1.25
Torque Specification
32.5 ft-lbs (44 N·m)
Important Notes
Torque value is estimated based on similar components.

Wheel Hub

1

Wheel Lug Nuts

M12 x 1.5
Torque Specification
100 ft-lbs (136 N·m)
Important Notes
Torque value is critical for wheel safety.
2

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Specification
85 ft-lbs (115 N·m)
Important Notes
Torque value is within the range of 80-90 ft-lbs (109-122 Nm).
3

CV Joint/Axle Nut

M16 x 1.5
Torque Specification
190 ft-lbs (257.5 N·m)
Important Notes
Torque value is within the range of 180-200 ft-lbs (244-271 Nm).

Trailing Arm

1

Trailing Arm Bolts

M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Torque value is within the range of 70-80 ft-lbs (95-109 Nm).

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

What IS the proper torque specification for lug nuts on a 1998-2000 GMC Envoy?

Lug nuts should be tightened to 110-130 ft-lbs (149-176 Nm).

Q2

What torque wrench should I use for tightening critical suspension components on my Envoy?

For critical suspension components, use a calibrated torque wrench with a range of 0-250 ft-lbs (0-339 Nm).

Q3

Can I use a manual torque wrench for all maintenance tasks on my Envoy?

While manual torque wrenches are suitable for most tasks, an electronic torque wrench IS recommended for precise and consistent torque application.

Q4

How often should I re-torque suspension bolts on my GMC Envoy?

Suspension bolts should be re-torqued every 6 months or 12,000 miles (19,312 km), whichever comes first.

Q5

Why IS it important to adhere to torque specifications?

Incorrect torque can cause damage to components, compromise vehicle safety, and affect handling and performance.

Q6

Where can I find additional torque specifications for my Envoy?

Refer to the GMC Envoy service manual, Mitchell OnDemand, or contact an authorized GMC service center for comprehensive torque specifications.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Digital Torque Wrench (10-100 Nm)

Essential for tightening fasteners to precise torque specifications, preventing damage and ensuring proper assembly. This range IS suitable for many applications on the envoy.

  • Digital display for accurate readings
  • Audible alarm when target torque IS reached
  • Multiple units (Nm, ft-lb, in-lb)
  • Reversible ratcheting mechanism
Learn more
Service Procedures
Technical Service Bulletins

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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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