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 noticed a while back that I started to get pinhole leaks in the front CV boots. I looked around on the Facebook page and found that a few of the mem [Go To Post]

Been a while since I updated this build. So a few things have changed. The old Goodyear Wranglers gave up the chase. They still had about 5-6/32" [Go To Post]

Replace your thermostat and possibly temp sensor first. You should be running at 210 not too much below.Statistics: Posted by djthumper — Sat Jun 16, [Go To Post]