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

LOL, yeah, definitely makes you scratch your head sometimes why they went and created some one-off things like 6x127 bolt pattern, 8" rear end, e [Go To Post]

Nice...I find that every single thing I not as straight forward as I think. I always figure it out...but they sometimes made this truck difficu [Go To Post]

I'm also trying to figure out what to do on the front of my TB and am curious if others have used these struts successfully with a 3" lift? [Go To Post]