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

I just changed gears 3.42 to 3.73 with a 31.5" tire my abs still works fine but lost my cruise controlStatistics: Posted by Tricguy007 — Wed Oct [Go To Post]

Update...picked up or camper this weekend and stated the drive in 3rd. Averaged 6.5mpg through the mountain area with the trans temp staying under 200 [Go To Post]

Hello. there is a CD / Aux button on the bose radio. does it only control cd player or can i find aux connector somewhere? [Go To Post]