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  1. The 02-09 "How-To" and DIY Section
    Bought a used 05 TB and the first gear winds out a little longer. If I accelerate spiritually it shifts smooth but if I want a slower acceleration it seems the last person either towed or had a heavy foot. How can I relearn the pattern to my driving?
  2. Transmission Mods
    Ok so 2005 trailblazer 2wd 230,000 plus miles driving the other day acted like it was in neutral so i rolled to a stop. I got out my code reader came out with p0014,p0340,p0849,and p1810 . Tried to start it a few times then started making a whirring noise like the flex plate or converter were...
  3. 02-09 General Tech Q&A
    Hi guys, it's been a while. A lot has happened, I have quite a few problems and could use some answers. First off, I have an 04 Trailblazer EXT 4WD 4.2 i6 w/ 166,000+ miles. I have not been able to drive it for about 1yr now , and I have no one else who can drive it. So it's been in my...
  4. The 02-09 "How-To" and DIY Section
    I have a 2004 Envoy that’s my daily driver. I don’t drive it much on the highway but after I topped off low ATF something happened. Car shifts completely normally through all gears until I take it on highway and drive 60+ mph for at least 10 minutes. After that kind of driving, once I come to a...
  5. 02-09 General Tech Q&A
    Having issues with 1st gear and overdrive. Weird thing is it works just fine when it starts up and gets on the road, shifts through all the gears just fine. Once i come to a full stop, it doesnt shift down into first, leaves off the line in second gear and also no overdrive. If i stop and shut...
  6. 02-09 General Tech Q&A
    Hi Folks. Couldn't find something like this up here. I have a 2006 Envoy Denali XL, 5.3L, 2WD. Love the vehicle, I've had it for 14 years. Last 2 months have been a struggle. Vehicle died on road. Cranked, but no fire. Turned out to be the Fuel Pump Relay wire on underside of fuse box as...
  7. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Hi, my 2006 GMC Envoy XL (4.2 L) with 154k slightly vibrates when I come to a stop, but when I put the transmission in N or P the vibration completely goes away. The car shifts up and down just fine. Sometimes, when I drive when the car is warm, like after pumping gas, for the first 5 seconds...
  8. The 02-09 "How-To" and DIY Section
    I'm having an issue unplugging the transmission plug that's above the transmission. The exhaust pipe is in the way to get a good grip on the plug. Can't seem to squeeze the oval enough top pop it off. Replacing the valve body and wiring harness with a rebuild unit that's had the pwm bore...
  9. 2013+ Chevrolet Trailblazer Forum
    Got in my 2003 Envoy XL yesterday and when I started it the ABS light and the Parking brake light both came on (not sure it has anything to do with the other issue, but it may). I put it into drive and pulled out of the driveway. As I went to accelerate the RPMs went up to 4000 but the truck...
  10. Transmission Mods
    So I have a 04 envoy 4x4 4.2L I just had my transmission replaced well come to find out the shop just rebuilt it so said that was in March 2022 come April 2022 I lost 4th then 3rd then 2nd gear only have 1st and reverse left I brought it back to the shop cause I had got a 3 year warranty on it...
  11. Transmission Mods
    I have a 2004 gmc envoy transmission I got from my old envoy to worked amazing. I saw a 2006 envoy on marketplace with a bad transmission. I’ve heard that it won’t work because the new envoys have an extra sensor in them. Is it true? Can I put an 2004 4.2 envoy transmission into a 2006 4.2...
  12. OEM Issues
    I'm trying to repair the 4L60E transmission of my 2004 Trailblazer 4x4 but I have and issue to remove the input drum, I already removed the band but the drum seems to be stuck...any suggestions?
  13. Transmission Mods
    (First post) hello I have a 2005 trailblazer 4x4 that needs a transmission and I have access to a possibly rebuilt 2003 s-10 zr2 4x4 4l60e and was wondering how hard a swap would be, my research shows that it should be basically plug and play after swaping the bellhouseing and transfer case, is...
  14. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Hi everyone! I know this has been covered in a few threads, but I have some symptoms not all. So here's the thing, two months ago after a long trip I felt my TB have a hard 1-2 upshift. It has been the bane of my existence since then. In that time to try and figure everything out, I have...
  15. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    my trailblazer wouldn't go into 3rd 6 months ago and we got an offer to switch out the transmission for a rebuilt one for $300 at the same time we messed with some of the electrical stuff because my right headlamp was off and we fixed both issues. but about 2 months ago it started to act up...
  16. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Hi, For the past few weeks i noticed the truck (trailblazer 2005) when going up a hill it suddenly gives high sound like i pressed the gas pedal to accelerate, when i feel that i remove my leg from gas pedal then press again and trucks drives normally. Today i was going uphill and i wanted to...
  17. OEM Issues
    Hello. I’ve been getting a p0128 for awhile and just ignored it and figured I’d get to it when I get to it. Not sure if it’s related to my reason for posting. My question is about the 2 new codes and breakdown I’ve experienced tonight. P0741 and P0894 are the codes and I’ll explain what...
  18. OEM Issues
    Hey guys, I have a 2004 Envoy I6. Today after about ten minutes of steep mountain curves I noticed a slight burning smell. The car wasn’t overheating and it didn’t smell like hot coolant so I assume the transmission was cooking. Fluid was flushed about 4 months ago so it’s pretty new. How normal...
  19. The "How-To" and DIY Section
    Hi folks, new to this forum and the answer may exist but have not had a chance to research so thought I would put my issue out there. Traveling on the highway and car just went into neutral. Had to coast to the side. Definitely not the shift cable as the car goes into and out of Park. Also...
  20. 4x4 Drivetrain
    About 6 months ago, I changed out my water pump. Yesterday, while my wife was driving, the nut connecting the fan clutch to the water pump backed off, threw the fan into the shroud, breaking it. That was an easy fix: new shroud, new fan clutch, new water pump. Here's the problem, though! The...
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