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!
Visit the Forums

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

You don't have to vent it because it is an AGM and already sealed.Statistics: Posted by djthumper — Fri Aug 17, 2018 6:18 pm [Go To Post]

viewtopic.php?f=6&t=2995First post has link to order decals.Statistics: Posted by Flyingfischer5 — Fri Aug 17, 2018 1:42 pm [Go To Post]

Are there still ortb decals available?Statistics: Posted by wstuckey1 — Fri Aug 17, 2018 12:47 pm [Go To Post]