Offroad Trailblazers and Envoys

Where have you driven your Trailblazer? has the information you need to modify your GMT360/70
for exploration and discovery of the unpaved areas in the world.

Check out our Articles below and join the forum!
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View the latest news posts and updates from ORTB.

Lifts / Suspension

Vehicle suspension maintenance information and lifting articles.

Wheels / Tires

Relating to everything wheels and tires.

Differentials / Axles

Look in here for information about drivelines and gearing.


Components built by members, and tips for your own fabrication.

Electrical / Communication

Batteries, wires, antennas, and buttons.


Stuck? We've got info to help you get out safely.

Utilities & Resources

Calculators, technical documents, and general resources.


Want to spend some time outside? You'll find info about that right here.


This section helps you find and resolve common problems.

Latest Forum Posts

5% Discount Code: 97D976259BE88AExpires: October 7, 2020Please enter this code in the ‘How Did You Hear About Us’ box to receive the discount. Please [Go To Post]

Hello everyone,I am planning to rebuild my axle disconnect with the AWD sleeve. It seems that many people already did this mod. However, I did not fin [Go To Post]

Hey All,After spending a few days researching, I am humbly asking for some assistance.First, the important info...Currently: 2008 Trailblazer LT, on s [Go To Post]