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

Just lowered the price to $6400 OBO!Statistics: Posted by Smartin11 — Fri Aug 16, 2019 1:58 pm [Go To Post]

Well true i just thought he was mentioning the shocks themselves( or strut cartridges) but yes they dont come with anything else lolSent from my iPhon [Go To Post]

5100s dont have springs...Statistics: Posted by HARDTRAILZ — Fri Aug 16, 2019 8:01 am [Go To Post]