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  1. Drivetrain Tech
    Okay so, Weird thing happened to me twice now. My car (3.6l/5L40) while cruising down the highway at 110 (kmph) shifts into park for a couple seconds then the car resumes. The physical shifter itself is in drive. I hadn’t touched it. Just the digital display reads out P (for park) and it kicks...
  2. Drivetrain Tech
    So the other day when I was driving home I stopped at a light and when it turned green I had next to no power, I crawled through the intersection and pulled over to see what was going on. I couldn't find anything so I turned the car back on and it was driving normal again for about 5 mins and...
  3. Drivetrain Tech
    Hello everyone, I am reposting my question since the first one is still awaiting approval or something, and it's been 10 days. Anyways I'm new to the forum but I've been lurking for quite some time. Been looking at G8s since 2010 (when I was ~18 or so) but could only find/afford one a year ago...
  4. Drivetrain Tech
    For those that did the 6l90 swap on the g8, did you guys use the 6l90e out of a ctsv or zl1? Does it even matter? I have a ctsv transmission I got for 600 dollars in great conditions. I was told that it would not work with the g8 though. That the transmission has to come from a zl1. Any input...
  5. Parts for Sale
    V6 (LY7) Thermostat & Housing Brand New in Box GM Part #92249137 $50 Two (2) Exhaust Packings New in Package GM Part #92066863 $20/pair Two (2) V6 (LY7) Water Connection O-Rings New in Package GM Part #92066705 $10/pair Transmission Shift Rod Bushing (V6) New in Package GM Part #92191384 $10...
  6. Drivetrain Tech
    Hey guys, New to ownership and the forum. Question I have is when I go to downshift in manual mode, I understand that there will be a slight delay with the auto, but the issue I am having is when I go to downshift, I have to pull back really hard or a few times to actually get it to register...
  7. G8 GT Talk (V8)
    Hey guys! Rolled into a little cash a while back and now looking to buy some parts for my G8. While adding power I know that the transmission can only handle so much, I was wondering if anyone knows of some site/place/store where I can get it either hardened or upgraded to be able to handle...
  8. Drivetrain Tech
    I put in a used transmission (5l40e) in my v6 G8 and it shifts ok but I kept getting a code for a tcm so I bought a used one and put it in, code kept coming so I bought a new one and put it in I'm still getting the code but I also get a 'internal mode switch' code and after driving for about...
  9. Drivetrain Tech
    I just got my trans finished yesterday and it drove good yesterday But I got in it this afternoon and took it around town(I was trying to get it inspected) but it started shifting hard, and a code came up for a tcm(I put one in before I put in the trans) I'm not sure what to do anymore with...
  10. Drivetrain Tech
    I bought a 2008 V6 G8 that needed a trans (so they say) had a trans guy come look at it and he said it was a tcm so I put on in and still having an issue The car says it's going to all of the gears but it sticks once it gets to 3rd and when the car gets hot it doesn't move at all So I bought a...
  11. Drivetrain Tech
    Hi folks. I feel embarassed to say that I'm hearing a "squak" coming from my transmission when up-shifting to 4th gear. I say a "squak", because I'm not sure how else to describe the sound. It's heavier and deeper sounding than a squeak. The transmission was built by Rossler to handle around...
  12. Drivetrain Tech
    Hello There! *I apologize in advance if I am posting an issue in the wrong spot, I just joined and I am still learning how to use the forums.* I have a 2008 Ponitac G8 GT V8 with a little more than 150k miles and i'm starting to have transmission issues. It started when I had all of the...
  13. Drivetrain Tech
    Hey guys, just looking for a little input on a problem I've been having with my pride and joy. I've read the other posts concerning this code, but none of them seem to match my symptoms. When in neutral, the car idles erratically. Almost as if it's going to stall at any minute, but it never...
  14. Drivetrain Tech
    I have a 2009 G8 with the 3.6L. I bought it certified in February of 2014 and luckily and still have a decent amount of warranty left and am trying to get this issue solved while under warranty obviously. The car is 100% stock (except for putting 20" Camaro SS wheels on) for now and is sitting...
  15. G8 GT Talk (V8)
    So I took a 2009.5 G8 GT in today that I am really interested in buying to get a pre-purchase inspection. Has 55,000 miles on it and body is in great condition. Everything was fine except for an oil leak and oil covering the bottom of the oil pan. Tech said it could possibly be the oil pan...
  16. Great Lakes
    Just bought a bone stock GT and the tranny could use come love, looking to get a decent tune on the tranny but I have neither the knowledge nor money to venture out on my own. Is there anyone in the columbus area that can help me out a decent HPT tune tranny tune? Obviously, I can pay, but I...
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