Trailblazers and Envoys Offroad

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When in doubt, contact us with any questions, idea’s and/or features you would like to see added to the site.

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Thanks and happy trails…

  • Sam says:

    I own a 2004 Trailblazer EXT and just found your site. Your site has motivated me to fix up and use my trailblazer for what it is made for. I would like ideas on what to start out with. I am not a man of means, so sites with specials, sales and clearances would be great. I would like to do the 2″ lift, wheels(black)/tires and of course any increase in engine performance. I would appreciate any help. Thanks.

    December 21, 2009 at 8:17 pm
  • Mike says:

    Saw your thread about repair the front axle 4wd disconnect, quick question, how many hours did it take to fix it? Thanks

    June 29, 2010 at 6:07 am
  • JamesDowning says:

    From setting the vehicle up on jack-stands to taking it off… I’d say it took a good 8 hours. But that included stopping to take pictures, stopping to consult my service manual, and eating lunch. I also had some trouble getting the actuator off the oil pan, which probably added an hour or two to the process.

    July 10, 2010 at 3:09 pm
    • Logan Greenway says:

      James do you live in Roanoke!? I’ve had my trailblazer for about 3 years now and have never had any idea where to start. If you could help me out it would be greatly appreciated!

      February 8, 2013 at 1:35 am
  • Amber says:

    I have a 2005 Trailblazer LS 4wd and am wanting so badly to get my vehicle like I imagine it. But It seems every time I turn around I run into another issue with finding wheels for Trailblazers bolt pattern or the offset messes it all up! My vehicle is identical to your vehicle Mr. Downing-and I would love to know more details about what you have done to your Trailblazer.
    What wheels do you have and what size tires? What size lift do you have? It would also be nice to be pointed in the right direction because I am going nowhere 🙁

    January 26, 2011 at 4:24 pm
  • francisco says:

    i just wanna know where did you get your bull bar on your old picture? cuz look really cool… thx to answer

    March 14, 2011 at 4:42 pm
    • JamesDowning says:

      To francisco:
      It’s a WAAG bar. Purchased online, but I don’t remember the source.

      June 8, 2011 at 5:00 am
  • Heath says:


    I am at a point I need to purchase a set of new tires for 2003 Trailblazer LS. I have set my eyes on a set of BF Goodwrech A/T KO tires. My question is …what the ideal tire size? The factory set was 245/70/16. However, I would like to put a larger tire on it..I think. I do not want a monsterly wide tire either though. I do like the wideth of the tires on your trailblazer in the picture.

    I appreciate any insight you could offer.



    April 29, 2011 at 5:02 am
  • JamesDowning says:

    Hello guys. I’d recommend you two join the forum, as that’s where the bulk of tire information is. There are so many variables in the equation of tire size, that I couldn’t cover them all in a single article.

    To cover things in the most general terms, if you want a tire 30.5″ diameter and smaller, you can do that stock. If you want to go above 30.5″, you will need at least wheel spacers and a mild lift. A lot also depends on backspacing of the tire, lift amount, etc.

    June 8, 2011 at 4:54 am
  • curtis royal says:

    i own a 2004 trailblazer LS 4X4 im having a hard time finding website to set it up for off road ding. can you ponit me on the right way?

    July 16, 2011 at 10:10 am
  • JamesDowning says:

    Check out our forums for sure.

    August 17, 2011 at 7:44 am
  • Mike Banach says:

    Mr. Downing, I’m putting a larger tire on my 2003 trailblazer, either a 31.1 in. dia. or a 31.7in. dia. My question for you is, do I have to use a 1.5 inch hub spacer as you did or will a 1 inch spacer also work without hitting the ball joint knuckle? I dont want the tires to stick out the wheel wells alot. I would appreicate your help. If you like you can email me at

    Thank you,
    Mike Banach

    September 20, 2011 at 5:47 pm
  • Robert Gebhardt says:

    My name is Robert Gebhardt owner of Traction Specializers and I operate Since April I have been supplying off road enthusiasts Maxtrax, an off road vehicle recovery tool. I invite you to check out our product on our website and I encourage you to offer feedback on it. I look forward to hearing from you soon.

    Robert Gebhardt
    Traction Specializers
    (570) 814 8614

    December 7, 2011 at 3:00 am
  • Peter Balazs says:

    Hi Mr. Downing,

    I found your article about the recovery very useful.
    I’m thinking to translate it to Hungarian and to share it on our association’s page with the link to the source. Would you mind if I do it?


    January 21, 2012 at 12:09 am
    • JamesDowning says:

      Peter, that would be fine, provided you clearly state as the source.

      Glad you found it helpful!

      January 24, 2012 at 5:33 pm
  • Karl Snyder says:

    Your pull down menus do not work in Google Chrome. When the pop-up and you move the mouse down, they disappear.

    July 2, 2012 at 10:05 pm
    • JamesDowning says:

      Thanks for the information. I do not use Chrome so I was unaware. It’s a bit sluggish in Firefox, but it’s workable. I’ll have to check it out in chrome and give it a try. I tried updating the .css file, try it again and see if that helps anything.

      July 3, 2012 at 2:54 pm
  • Avner Baruch says:


    i loved the article you posted about the roof top tent.
    i am thinking about building one and i would appreciate very much if you could share with me the size of the stainless steel hinges.


    July 25, 2013 at 10:48 am
    • JamesDowning says:

      Avner, I assume you’re talking about this topic in the forum: ?

      I had originally considered making these myself, but after some searching, I found a company that had these for sale. The company is called “Compact Camping Concepts”. Their representation can also be found on the Expedition Portal forum.

      I do not recall the exact dimensions of these brackets, but I beleive they are about 4.5″ vertically from their base flange to their rotational hole center. The stainless plate is probably 3/32″ thick. The RTT is currently stored away, so I do not have immediate access to taking measurements.

      If you need further assistance, I’d recommend joining the forum and opening some discussion in the aforementioned thread.


      July 25, 2013 at 1:06 pm
  • edward hernandez says:

    where are you guys located at? im trying to get a grill guard put on my trailblazer.

    December 3, 2013 at 9:26 pm
    • JamesDowning says:

      Hey Edward, we are located all over the US. Join the forum to see if anyone is located nearby.

      December 4, 2013 at 1:06 pm
  • Dan says:

    Hi..just had a quick question. Was wondering if you could tell me if a front carrier/differential from either a 2005 or 2006 trailblazer, is the same as what’s in a 2004 GMC Envoy XL? my old one was a 3.42 (opt GU6) and both the replacements are out of trailblazers..and are both 3.42 (opt GU6)

    Just wanted to ask someone who could tell me, if they are interchangeable or not.


    December 8, 2014 at 4:56 pm
    • JamesDowning says:

      From my understanding, all of the front differentials are the same from 2002 to 2009, across all GMT360/370 platforms. You can swap them out as long as you match the gear ratio.

      The rear differentials are different depending on the engine and wheel base of the vehicle.

      December 10, 2014 at 1:55 pm
  • Connor Barnes says:

    Wanting to do the same front bumper as you did. Do you have any in depth pictures of what you used or measurements of the bumper


    January 23, 2015 at 2:55 am
  • Joel Morffi says:

    I need help with my username/password, I can’t login 🙁

    September 28, 2015 at 10:24 pm
    • Trail X says:

      Joel, email your information to admin(at)

      October 2, 2015 at 5:06 pm
  • jeremy says:

    I have a few questions.i looked up z71 on ebay but is that just the springs or shocks I’m looking for? And with bds, the only kit I found includes absorbers too. I’m kinda new to this so I’m trying to price everything out

    November 1, 2015 at 4:58 pm
    • Trail X says:

      Jeremy, the Z71 spring part number that’s found in the forum should just be the springs. However, its often sold with the shocks too, you’ll have to see on the individual seller’s post on ebay.

      Last time I checked, the BDS lift was available with or without the shocks. The shocks they sell are a lot better than the Z71 shocks found on ebay. So I’d go for it if its in your budget. Go to the BDS website to order your lift, they have an option somewhere in the ordering process to include or not include the shocks (and which shocks to order, the FOX shocks are pretty good so I hear).

      Join this website’s forum, there’s many more people there to help you.

      November 2, 2015 at 3:47 pm
  • Nick says:


    I like the WAAG bars you put on your trailblazer. Would you happen to have P/N’s for them? The WAAG website doesn’t appear to offer these any longer?

    Thank you for your time!


    September 30, 2016 at 3:44 pm
    • Trail X says:

      Nick, I do not believe that WAAG sells anything for the Trailblazer anymore.

      September 30, 2016 at 5:24 pm
  • Donald Rak says:

    Hi,guys,well i-have G80 differential in 1986 Chevy Suburban has over 200,309.Miles on it and was still going till in messed up the darn big pin in middle with 5/16 pin bolt broke and i-got extremely lucky i-was close to home when it let got sounded like someone was beating heck out my differential,i-took it apart and said how did this happen,Big pin was out beating on my pinion and split the carrier it’s still together but got nice crack in it,how the heck you get out the flip-lock barrel parts for posi to hook up.Seems there pressed in,can you help me with this,can it all go into normal open diff. i-have that on hand,out my other suburban.Any Help will be Great Thanks Donald.

    October 9, 2016 at 10:39 pm

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