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

I don't think dual shear is necessary. I got the single shear from EMS and its been solid.That tubing does sound stout. I want to say mine is 1/8 [Go To Post]

The latter is a bombin idea. Storage for the win, amirite?Statistics: Posted by mason10198 — Mon Jan 22, 2018 12:59 am [Go To Post]

I go back and forth between cutting the back frame and raising it the 3" to not use the lift blocks behind the rear axle, and putting in a deep f [Go To Post]