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!

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

xXxSilveradoxXx wrote:flyboy2610 wrote:Those certainly are some brightly colored rims!Yeah, I really wanted a little flash! Unfortunately the pictures [Go To Post]

I've got 4.56s on my 2004 and the cruise control and ABS work. I used EFI Live for tuning.Statistics: Posted by xXxSilveradoxXx — Mon May 22, 202 [Go To Post]

I've got a TruTrac in the Trailblazer. I really like it, but I also don't do gnarly things with the rig. Took it to Usal Beach in January an [Go To Post]