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  1. What kind of Rear Differential is this?

    The 02-09 "How-To" and DIY Section
    Hello all, I'm new to the forums and would like to say hi. I have a 2005 Trailblazer LS with the I6 4.2L and it has 4WD and AWD on the instrument panel. So I jacked it up put it on stands and removed the rear brakes and realized the backing plates are rusted and wasted. So I decided to drop...
  2. 2004 Envoy V8 - Front Differential Removal

    The "How-To" and DIY Section
    Has anyone removed the front differential on a V8 Envoy? Can it be removed without pulling the oil pan? Thanks in advance!!!
  3. Whiny noise from front differential

    The "How-To" and DIY Section
    2007 Envoy SLT 4x4 The video below shows exactly what is going on with my Envoy. I have checked the parts diagram and there is a bearing on the left side of the differential where the CV shaft inserts into. Issue: Whiny/grinding noise like a bearing has gone out. Put both front wheels up off...
  4. 4wd Front Diff gets no power

    4x4 Drivetrain
    I purchased my 2002 Trailblazer LTZ with 85k in september, and once it began snowing I realized my 4wd isn't working. I went through all the diagnostics and found that my transfer case works fine and engages, yet my front diff got no power. My front actuator works fine, so next I was going to...
  5. Front CV Shaft Loose

    4x4 Drivetrain
    I purchased my 2002 Trailblazer LTZ in september, and once it began snowing I realized my 4wd isn't working. I went through all the diagnostics and found that my transfer case works fine and engages, yet my front diff got no power. My front actuator works fine, so next I was going to take apart...
  6. rear differential cover leak

    4x4 Drivetrain
    My '02 Envoy XL developed a slow oil leak on the rear differential. It was due for a lube change so I order a new gasket and change the oil. Cleaned the cover and replaced the gasket/seal, refilled w/ new Mobile1. The leak continues, it appears the cover has a pin hole where the GM part...
  7. 2003 Bravada Front Diff Replacement Gone Wrong, HELP!

    4x4 Drivetrain
    The front differential on my 2003 Bravada went out. I had brought to local mechanic who ive went to before. After 3 weeks or so I got a phone call yesterday. The mechanic said that its finished. I went and paid for it, $1200 for diff and labor. Pulling out of mechanics parking lot about 1/4 mile...
  8. Leaking front diff solution

    4x4 Drivetrain
    Any opinions on using red grease in the front differential on an '02 TB? The theory is the thicker grease won't leak out as profusely as the standard gear oil. I've used the lucas gear oil with good results, but it still leaks especially when it gets hot in 4wd driving in the snow.
  9. [SOLVED] Loud Rumbling Upon Acceleration

    4x4 Drivetrain
    Hey wrench heads, need some opinions before I start throwing parts at it. 03 Tb LS I6, 185000miles. The sound(rumble) starts at low speed and increases on acceleration and rumble stays consistent at 50 and above. No vibration in steering wheel, but rumble after 40mph feels like subs bumping...
  10. Front Differential Axle Disconnect Bearing

    4x4 Drivetrain
    After reading several posts on this site, it's apparent the bearing in the front, passenger side axle disconnect has a tendency to go bad for lack of grease. An entire unit is around $500. Has anybody tried to remove the bearing itself and replace it? Sure would be nice to do that instead of...
  11. Front Diff Empty... Cause?

    4x4 Drivetrain
    My girlfriend's Envoy has no fluid in the front differential. I discovered this during my first check of all the fluids and I didn't see any obvious signs of leakage, so who knows how long it has been like this. Obviously I will fill the damn thing back up asap. In the meantime, I have 2...
  12. front tires wont spin/engage 4x4 problems

    4x4 Drivetrain
    this is my first time posting so excuse me if I make some mistakes, so here is the problem the front tires spin wont spin when I put the truck into a4wd, 4hi or 4lo, I do not have a 4x4 service light and I can hear the 4x4 engaging underneath the truck, so the first thing I tried was I replaced...
  13. Front End Vibration?

    OEM Issues
    Hello, I have a 04 trailblazer with 130,000 miles on it. Last week I replaced my radiator and water pump and added a transmission cooler, because it has been running hot (over 210) it’s been doing this for the past 3 summers and I have previously replaced the thermostat and fan clutch and it’s...
  14. Two transfer case encoder motors destroyed in six months, possible front diff problem

    General
    I've been lucky enough to fix quite a few problems based on TrailVoy posts, but I've run into a unique situation that I haven't been able to find in the search results. This is for a 2005 Buick Rainier with the 5.3L engine, A4WD NVG 126 transfer case and non-locking front differential. Milage...
  15. Limited Slip Front Differential GB?

    4x4 Drivetrain
    As I'm sure you guys know our front differential case uses 7.25" ring...JUUUST small enough that we can't get a limited slip differential (LSD) based on what's universally available. However, as I'm planning to do more autocrossing in my AWD TBSS, I've determined that having an open diff up...
  16. Front end vibration/rattle at speed.

    General
    I have a 04 TB EXT 4x4 that has developed a 'rattle' above 45 MPH. It is more of a vibration in the floorboard than a noise and is only noticeable on a smooth road. The best description I can give is it feels like someone is hitting the floorboard with a rubber mallet intermittently. The...
  17. Pulsing Vibration while driving

    4x4 Drivetrain
    I have a 2002 TB LTZ and while I'm driving there is a vibration sound/feeling through the gas pedal. It sounds just as if 4WD is engaged, but it's not. It is very loud when around 30-40 MPH. My Transfer case actuators are working but switching between 2HI and AWD and 4WD sounds no different as...
  18. Another G80 Question

    4x4 Drivetrain
    I know that the G80 has been covered ad nauseum here, but I cannot find the answer to my specific questions. I do NOT have a G80 in my trailblazer, but I want to have one added in. I went to the dealership and they told me that I needed the G80 AND a different carrier. Both about $600 plus...
  19. G80 Yeahh

    G80 Yeahh

    G80! G80! G80! YEAH YEAH YEAH! Locking Rear Differential. For the win? Yes. The salesman who was with me on my first test drive couldn't find the code. Well guess what, I DID!
  20. Strange Growling noise coming from front end.

    OEM Issues
    Hello everyone. I'm new to the site, and I did some searching around for any threads that have a similar description but I haven't found any so far. I have an 05 TB LT EXT with 4 wheel drive. The noise that is coming from the front end almost sounds like a bad wheel bearing, but the weird thing...
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