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

sry for opening this old thread again, but i try to find the original spring ratio of my front springs so i can get some new springs manufactured by H [Go To Post]

HotSiveston wrote:ice79 wrote:Got my new tires today I'm very happy with the look saving up some money buy phenq for next projectGood choice of n [Go To Post]

The NP231C swap should be quite easy. You'll need a transfer case adapter off of a 1500 series truck that had the 700R4 or the 4L60-E to convert [Go To Post]