GMC Vehicle Models Sonoma 1994-2004 Torque Specifications
GMC Vehicle Models Sonoma 1994-2004

GMC Vehicle Models Sonoma 1994-2004 Torque Specifications

Complete GMC Vehicle Models Sonoma 1994-2004 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

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Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

2.2l Engine

Torque specifications for 2.2L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure bolts are tightened in the specified sequence to prevent warping of the cylinder head.
2

Spark Plugs

M14 x 1.25
Torque Specification
11 ft-lbs (15 N·m)
Important Notes
Ensure proper sealing of the spark plugs to prevent combustion chamber leaks.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure bolts are tightened in the specified sequence to maintain crankshaft alignment.
2

Connecting Rod Nuts

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure proper tightening to maintain engine balance and piston movement.

Flywheel And Pulleys

1

Flywheel Bolts

M12 x 1.5
Torque Specification
46 ft-lbs (62 N·m)
Important Notes
Ensure bolts are tightened in the specified sequence to maintain flywheel alignment.
2

Camshaft Sprocket Bolt

M10 x 1.25
Torque Specification
63 ft-lbs (85 N·m)
Important Notes
Ensure proper tightening to maintain camshaft rotation and valve timing.

Oil System

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
0.89 ft-lbs (10 N·m)
Important Notes
Ensure bolts are tightened in the specified sequence to prevent oil leaks.
2

Oil Drain Plug Bolt

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure proper tightening to prevent oil leaks and ensure proper oil system maintenance.

Valve Mechanism

1

Valve Cover Bolts

M6 x 1.0
Torque Specification
0.89 ft-lbs (10 N·m)
Important Notes
Ensure bolts are tightened in the specified sequence to prevent oil leaks.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
19 ft-lbs (26 N·m)
Important Notes
Ensure proper tightening to maintain valve operation and engine performance.

4.3l Engine

Torque specifications for 4.3L Engine

Cylinder Head

1

Cylinder Head Bolts

M10 x 1.5
Torque Specification
1. 18 ft-lbs (25 N·m) 2. 90°
Important Notes
Torque-to-yield (TTY) bolts. Initial torque followed by a 90° angle turn. Ensure bolts are clean and lubricated before installation.
2

Rocker Arms/Shafts Bolts

M8 x 1.25
Torque Specification
19 ft-lbs (26 N·m)
Important Notes
Ensure rocker arms are properly aligned before tightening.

Crankshaft And Bearings

1

Main Bearing Bolts

M12 x 1.75
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Tighten in the specified sequence to ensure even clamping force.
2

Connecting Rod Nuts

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Ensure connecting rods are properly aligned before tightening.
3

Flywheel Bolts

M12 x 1.75
Torque Specification
46 ft-lbs (62 N·m)
Important Notes
Ensure flywheel is properly seated before tightening.

Intake And Exhaust

1

Intake Manifold Bolts

M8 x 1.25
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in the specified sequence to prevent warping of the manifold.
2

Exhaust Manifold/Headers Bolts

M8 x 1.25
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure exhaust manifold is properly seated before tightening.

Lubrication System

1

Oil Pan Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a crisscross pattern to ensure even sealing.
2

Oil Pump Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar components.

Cooling System

1

Water Pump Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a crisscross pattern to ensure even sealing.
2

Thermostat Housing Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a crisscross pattern to ensure even sealing.

Accessory Drives

1

Starter Motor Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure starter motor is properly aligned before tightening.
2

Alternator Mounting Bolts

M10 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Ensure alternator is properly aligned before tightening.

4l60 Transmission

Torque specifications for 4l60 Transmission

Transmission Mounting

1

Transmission Mounting Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)

Transmission Oil Pan

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Specification
89 in-lbs (10 N·m)
Important Notes
Note: The torque value is in inch-pounds, not foot-pounds.

Transmission Fluid System

1

Transmission Drain and Fill Plugs

M14 x 1.5
Torque Specification
27 ft-lbs (37 N·m)
2

Transmission Fluid Drain/Fill Plug

M14 x 1.5
Torque Specification
27 ft-lbs (37 N·m)

Bellhousing and Crossmember

1

Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on industry standards.
2

Transmission Crossmember Bolts

M14 x 1.5
Torque Specification
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on industry standards.

Torque Converter and Cooler Lines

1

Torque Converter Bolts

M10 x 1.25
Torque Specification
30 ft-lbs (41 N·m)
Important Notes
Estimated value based on industry standards.
2

Transmission Cooler Line Fittings

M8 x 1.25
Torque Specification
20 ft-lbs (27 N·m)
Important Notes
Estimated value based on industry standards.

Transmission Filter

1

Transmission Filter Bolts

M6 x 1.0
Torque Specification
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on industry standards.

Body

Torque specifications for Body

Suspension And Steering

1

Strut/Shock Absorber Mounting Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
2

Control Arm Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
3

Ball Joint Nut

M18 x 1.5
Torque Specification
52 ft-lbs (70 N·m)
4

Tie Rod End Nut

M16 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
5

Sway Bar Link Nut

M16 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
6

Steering Gear/Rack Bolts

M16 x 1.5
Torque Specification
81 ft-lbs (110 N·m)

Body And Frame

1

Body Mount Bolts

M14 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Consult the vehicle's manufacturer or a repair manual for specific torque values.
2

Bumper Mounting Bolts

M12 x 1.5
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated value. Consult the vehicle's manufacturer or a repair manual for specific torque values.

Doors And Hood

1

Door Hinge Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Consult the vehicle's manufacturer or a repair manual for specific torque values.
2

Hood Hinge Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Consult the vehicle's manufacturer or a repair manual for specific torque values.
3

Trunk Lid Hinge Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Consult the vehicle's manufacturer or a repair manual for specific torque values.

Brakes

Torque specifications for Brakes

Brake Caliper Assembly

1

Brake Caliper Bolts

M10 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
These bolts secure the brake caliper to the mounting bracket. Proper torque ensures stability during braking.
2

Brake Caliper Mounting Bracket Bolts

M12 x 1.5
Torque Specification
89 ft-lbs (120 N·m)
Important Notes
These bolts attach the caliper mounting bracket to the vehicle’s frame or axle.

Brake Disc Drum Assembly

1

Brake Disc/Drum Retaining Bolts

M12 x 1.5
Torque Specification
89 ft-lbs (120 N·m)
Important Notes
These bolts hold the brake disc or drum in place. Proper torque prevents wobbling or misalignment.

Wheel Assembly

1

Wheel Lug Nuts

M14 x 1.5
Torque Specification
100 ft-lbs (135 N·m)
Important Notes
These nuts secure the wheel to the hub. Proper torque prevents wheel detachment or misalignment.

Brake Hydraulic System

1

Brake Line Fittings

M10 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on typical brake line fitting torque. These fittings connect the brake lines to the caliper or brake system components.
2

Brake Master Cylinder Mounting Bolts

M8 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated value based on typical master cylinder bolt torque. These bolts secure the brake master cylinder to the vehicle’s frame.

Brake Pedal Assembly

1

Brake Pedal Assembly Bolts

M8 x 1.25
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated value based on typical pedal assembly bolt torque. These bolts secure the brake pedal assembly to the vehicle’s chassis.

Drivetrain

Torque specifications for Drivetrain

Engine and Transmission Mounting

1

Engine Block to Transmission Bellhousing Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated value based on industry standards.
2

Transmission Crossmember Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated value based on industry standards.

Flywheel and Crankshaft

1

Flywheel Bolts

M10 x 1.25
Torque Specification
46 ft-lbs (62 N·m)
2

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Specification
111 ft-lbs (150 N·m)

Main Bearings and Connecting Rods

1

Main Bearing Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
2

Connecting Rod Nuts

M10 x 1.25
Torque Specification
20 ft-lbs (27 N·m)

Timing Belt/Chain and Camshaft

1

Timing Belt/Chain Tensioner Bolt

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
2

Camshaft Sprocket Bolt

M14 x 1.5
Torque Specification
63 ft-lbs (85 N·m)

Transmission and Transfer Case

1

Transmission Mounting Bolts

M14 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
2

Transfer Case Mounting Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated value based on industry standards.

Driveshaft and Axles

1

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Specification
59 ft-lbs (80 N·m)
2

CV Joint/Axle Nut

M18 x 1.5
Torque Specification
173 ft-lbs (235 N·m)

Differential and Transfer Case Fluid Reservoirs

1

Differential Drain/Fill Plug

M12 x 1.5
Torque Specification
27 ft-lbs (37 N·m)
2

Transfer Case Drain/Fill Plug

M12 x 1.5
Torque Specification
27 ft-lbs (37 N·m)

Electrical

Torque specifications for Electrical

Ignition System

1

Ignition Coil Bolt

M8 x 1.25
Torque Specification
6.6 ft-lbs (10 N·m)
Important Notes
Estimated bolt size. Proper torque ensures the coil is securely fastened and prevents damage to the coil or engine block.
2

Spark Plug Wire Retainer Bolts

M6 x 1.0
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated bolt size. Proper torque ensures the retainers are securely fastened and prevents damage to the spark plug wires or boots.
3

Ignition Module Mounting Bolts

M10 x 1.5
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated bolt size. Proper torque ensures the module is securely fastened and prevents damage to the ignition module or engine block.

Starting System

1

Starter Motor Mounting Bolts

M12 x 1.75
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated bolt size. Proper torque ensures the starter motor is securely fastened and prevents damage to the starter motor or engine block.
2

Battery Terminal Nuts

M8 x 1.25
Torque Specification
6.6 ft-lbs (10 N·m)
Important Notes
Estimated bolt size. Proper torque ensures the terminal nuts are securely fastened and prevents damage to the battery or electrical system.

Charging System

1

Alternator Mounting Bolts

M12 x 1.75
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Estimated bolt size. Proper torque ensures the alternator is securely fastened and prevents damage to the alternator or engine block.
2

Fuel Pump Electrical Connector Bolts

M6 x 1.0
Torque Specification
1. 10 ft-lbs (14 N·m) 2. 15 ft-lbs (20 N·m)
Important Notes
Estimated bolt size. Proper torque ensures the connector bolts are securely fastened and prevents damage to the fuel pump or electrical system.

Emissions Sensors

Torque specifications for Emissions_sensors

Egr System

1

EGR Valve Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Torque ensures secure mounting of the EGR valve to prevent leaks.

Exhaust Manifold

1

Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Torque ensures a tight seal to prevent exhaust leaks.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Torque ensures a tight seal between the manifold and cylinder head.

Exhaust Pipe

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M12 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Torque ensures a secure connection between the pipe and manifold.
2

Catalytic Converter to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Torque ensures a secure connection between the catalytic converter and pipe.
3

Muffler to Exhaust Pipe Bolts

M12 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Torque ensures a secure connection between the muffler and pipe.

Emissions Sensors

1

Oxygen Sensor (O2 Sensor) Mounting Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Torque ensures secure mounting of the O2 sensor to prevent leaks.
2

Exhaust Gas Temperature Sensor Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Torque ensures secure mounting of the temperature sensor to prevent leaks.

Exhaust

Torque specifications for Exhaust

Exhaust Manifold Headers

1

Exhaust Manifold/Headers to Engine Block Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure the manifold or headers are properly aligned before tightening.
2

Exhaust Manifold/Headers to Cylinder Head Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the manifold or headers are properly aligned before tightening.

Exhaust Pipe Connections

1

Exhaust Pipe to Exhaust Manifold/Headers Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure the exhaust pipe is properly aligned before tightening.
2

Catalytic Converter to Exhaust Pipe Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the catalytic converter is properly aligned before tightening.
3

Muffler to Exhaust Pipe Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure the muffler is properly aligned before tightening.

Exhaust System Support

1

Exhaust Heat Shield Bolts

M6 x 1.0
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the heat shield is properly positioned before tightening.
2

Exhaust Hanger Bolts

M8 x 1.25
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Ensure the exhaust hanger is properly positioned before tightening.

Exhaust Flange Connections

1

Exhaust Flange Bolts

M10 x 1.5
Torque Specification
26 ft-lbs (35 N·m)
Important Notes
Ensure the flanges are properly aligned before tightening.

Fuel

Torque specifications for Fuel

Fuel Rail and Injectors

1

Fuel Rail Bolts

M8 x 1.25
Torque Specification
7.4 ft-lbs (10 N·m)
2

Fuel Injector Bolts

M8 x 1.25
Torque Specification
7.4 ft-lbs (10 N·m)

Fuel Pump and Electrical Connectors

1

Fuel Pump Mounting Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
2

Fuel Injector Electrical Connector Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)
3

Fuel Pump Electrical Connector Bolts

M6 x 1.0
Torque Specification
7.4 ft-lbs (10 N·m)

Fuel Tank and Ventilation

1

Fuel Tank Strap Bolts

M12 x 1.75
Torque Specification
18 ft-lbs (25 N·m)
2

Fuel Tank Vent Valve Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Fuel Filter and Filler Neck

1

Fuel Filter Bolt/Nut

M12 x 1.75
Torque Specification
18 ft-lbs (25 N·m)
2

Fuel Filler Neck Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)

Fuel Pressure Regulator and Lines

1

Fuel Pressure Regulator Mounting Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar components and bolt sizes.
2

Fuel Line Fittings

M12 x 1.75
Torque Specification
18 ft-lbs (25 N·m)

Hvac

Torque specifications for Hvac

HVAC Compressor Mounts

1

A/C Compressor Mounting Bolts

M10 x 1.25
Torque Specification
37 ft-lbs (50 N-m)
Important Notes
Estimated torque value for M10 x 1.25 bolts. Verify specific bolt size and thread pitch for your application.

Refrigerant Lines

1

Refrigerant Line Fittings

1/4 inch pipe thread
Torque Specification
18 ft-lbs (25 N-m)
Important Notes
Estimated torque value for 1/4 inch pipe thread fittings. Consult the specific fitting manufacturer's recommendations for precise torque specifications.

Water Pump Assembly

1

Water Pump Mounting Bolts

M8 x 1.25
Torque Specification
89 in-lbs (10 N-m)
Important Notes
Estimated torque value converted from in-lbs to ft-lbs for M8 x 1.25 bolts. Ensure accurate conversion and verify sizing for your application.

HVAC Thermostat Housing

1

Thermostat Housing Bolts

M6 x 1
Torque Specification
89 in-lbs (10 N-m)
Important Notes
Estimated torque value converted from in-lbs to ft-lbs for M6 x 1 bolts. Verify sizing and ensure precise conversion for your application.

Evaporator Core Mounts

1

Evaporator Core Mounting Bolts

M10 x 1.5
Torque Specification
18 ft-lbs (25 N-m)
Important Notes
Estimated torque value for M10 x 1.5 bolts. Verify specific bolt size and thread pitch for your application.

Suspension

Torque specifications for Suspension

Strut And Shock Absorber Mounting

1

Strut/Shock Absorber Mounting Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the bolts do not come loose over time, which could lead to uneven tire wear, reduced handling, and compromised safety.

Control Arm Assembly

1

Control Arm Bolts

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the bolts do not come loose, which could cause uneven tire wear, reduced handling, and compromised safety.
2

Upper Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated torque value. Proper torque ensures the bolts do not come loose, which could cause uneven tire wear, reduced handling, and compromised safety.
3

Lower Control Arm Bushing Bolts

M10 x 1.25
Torque Specification
35 ft-lbs (47 N·m)
Important Notes
Estimated torque value. Proper torque ensures the bolts do not come loose, which could cause uneven tire wear, reduced handling, and compromised safety.

Steering Assembly

1

Ball Joint Nut

M14 x 1.5
Torque Specification
52 ft-lbs (70 N·m)
Important Notes
Proper torque ensures the nut does not come loose, which could cause uneven tire wear, reduced handling, and compromised safety.
2

Tie Rod End Nut

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the nut does not come loose, which could cause uneven tire wear, reduced handling, and compromised safety.
3

Steering Knuckle Bolts

M14 x 1.5
Torque Specification
75 ft-lbs (102 N·m)
Important Notes
Estimated torque value. Proper torque ensures the bolts do not come loose, which could cause uneven tire wear, reduced handling, and compromised safety.

Sway Bar Assembly

1

Sway Bar Link Nut

M12 x 1.5
Torque Specification
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the nut does not come loose, which could cause uneven tire wear, reduced handling, and compromised safety.

Coil Spring Assembly

1

Coil Spring Insulator Bolts

M10 x 1.25
Torque Specification
25 ft-lbs (34 N·m)
Important Notes
Estimated torque value. Proper torque ensures the bolts do not come loose, which could cause uneven tire wear, reduced handling, and compromised safety.

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 recommended torque for lug nuts on a 1994-2004 GMC Sonoma?

95 ft-lbs (129 Nm) using a calibrated torque wrench.

Q2

What IS the correct torque for spark plugs in a 4.3L V6 engine?

15-18 ft-lbs (20-24 Nm) when installing new spark plugs. Use caution not to overtighten.

Q3

What tools are recommended for accurate torque measurements?

Always use a properly calibrated torque wrench or torque multiplier. Socket extensions and adapters can affect torque readings, so use them sparingly.

Q4

What are the torque specs for cylinder head bolts on a 2.2L inline-4 engine?

70 ft-lbs (95 Nm) in three stages: 30 ft-lbs, then 45 ft-lbs, then 70 ft-lbs. Refer to the GMC service manual for detailed instructions.

Q5

How often should I check the torque on critical fasteners?

Inspect and retorque critical fasteners, such as lug nuts, every 12,000 miles (19,000 km) or as specified in the maintenance schedule.

Q6

What are the consequences of improper torque application?

Under-torquing can lead to component failure, leakage, or vibration issues. Over-torquing can damage threads, bolts, or components. Always follow GMC's 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

Torque Wrench (10-200 ft-lbs)

Essential for tightening fasteners to precise torque specifications, preventing damage to components and ensuring proper assembly.

  • Calibrated accuracy with a wide torque range
  • Beam or digital display for visible torque readings
  • Both inch-pound and foot-pound measurements
  • Ratcheting head for easy operation
Learn more

Socket Set (Metric and SAE)

Necessary for removing and installing bolts and nuts, covering the various sizes used on the sonoma.

  • Complete set of metric and SAE sockets
  • Chrome-plated for durability and corrosion resistance
  • Range of socket sizes to fit most bolts and nuts on the vehicle
Learn more
Service Procedures

Bolt Torque Specifications

Comprehensive listing of torque specifications for various components on the sonoma.

  • Torque values for engine, suspension, brakes, and other components
  • Clear identification of bolt sizes and locations
  • Safety precautions and proper tightening sequence
View full procedure
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.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
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About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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