Jump to content

  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

GM 8 Speed Transmission. On the new GM 1500 Trucks

lulu88
 Share

Recommended Posts

  • 2 months later...
GullLakeMi Enthusiast

GullLakeMi

Posted
Posted
On 12/10/2020 at 11:05 AM, Ecochef said:

My truck has the 19' 1500 4x4 5.3L with the 8speed and i constantly have a hard catch, notchy feeling shift between first and second at low speeds at various times.  Like it doesn't catch and then lurches forward or back (if in reverse).  Taken it the dealer several times and because the techs can't 'replicate it' I'm SOL.

Can't help but pile on here.  Same with my '16 6.2L 8 speed.  I take my kids to school most mornings and they comment on the hard low speed shifts.  I hate spending time at the dealer and let them win the "we can't reproduce it game".  I've ignored it for a long time.  I'll be trading in soon.  I guess the positive is it has never left me stranded.  

Link to comment
Share on other sites
  • 3 months later...
Chevrolet1 Enthusiast

Chevrolet1

Posted
Posted

My 2019 5.3L / 8-speed only has 7k miles and, when I bought it a few months ago, noticed two concerns. After a trip to the dealer, they updated the TCM and changed the fluid. Now it drives and shifts great, no issues. Newer models (2020+) will come with updates from the factory that address these concerns. The biggest issue(s) with the 8-speed were with the prior generation trucks (up to 2018). 

Link to comment
Share on other sites
  • 3 weeks later...
dobroplayer New Member

dobroplayer

Posted
Posted

I drove the 6.2 8 speed for 3 years in a 2017 GMC and had nothing but trouble. Never was right. My wife bought a 2019 and they STILL hadn't fixed the issues 2 years later, and had to have a tranny flush before the first payment. 

 

I can say that my new 2020 6.2 with the 10 gets now where near the MPG, and I don't think it is as quick, even with the "performance package".

 

I personally would be leery of the 8 speed. Just my $.02...

 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

  • Similar Content

    • Scotty Harder
      Brake pedal goes to the floor and now brakes won’t register to shift out of park
      By Scotty Harder
      So around this time of year last year I changed my brakes and my rotors and was going to replace my front bearings as well. My 08 is a Michigan truck so it’s got a plethora of rust accumulated. One of caliper bolts had seized so I completed what I could with the brakes and headed home to figure the best attack for a seized rusted bolt with thread lock. Anyways that bolt was a ******, so I went to my brother cause he had an air compressor and thought we’d try that. Needless to say the bolt one, so my brother put the wheel back together but before he put the caliper back in place over the rotor he decided to decompress the spring?. Why? I have zero idea thought it was pointless for him to do that Considering I had to do it to change the springs. So I start to head back home just worried about getting this bolt out so I can change my bearing. So as I start to leave I don’t notice anything out of place until I get down the road and my brake pedal goes to the floor. It made no sense, I couldn’t figure out what happened in the 30 minutes I was there; that would take my brakes from having good pressure to having none.  Then not long after that my fuel pump goes. Old Murphy’s law coming in clutch for me! So I get the fuel pump swapped get the caliper freed so I could replace my bearing. Then go to bleed my brakes and I can’t get any of my brake pedal back. I have abs so I I went out and bought a scan tool cause I heard bleeding brakes with an abs system without the scan tool is difficult and is more than likely the reason my brakes still go to the floor. So I do everything the device tells me to. There’s no change, except now I can’t shift it out of park to even attempt to check if there’s at least some pressure. I’ve been battling these brakes so at least the last half of 2021 my family is telling me to just sell it for whatever. Honestly I don’t want to sell it I rather enjoy having it and am not ready to let it go. Any help or advice would be so appreciated!



    • austin jez
      2013 silverado hellaproblems
      By austin jez
      Hello all. I have a 2013 silverado w/5.3l flex vin 7. Basically has rough idle in park and drive. Very poor acceleration. Almost seems to bog down when trying to accelerate. It will occasionally surge and for just a split second I can feel a bit of power.  Also doesn't want to downshift when I lean on the gas pretty heavy. I've got to do near floor it to get it to down ****** and when it does it will drop down 2 gears a lot of the time. No engine light and it won't set any codes. Showed 0 misfires on all cylinders. Long Fuel trims usually in single digits negs. Fuel pressure 43-46psi at idle and highway. I've replaced throttle position sensor, Accelerator pedal position sensor, manifold pressure sensor, mass air sensor, plugs, coolant temp sensor, oxygen sensors. Fuel pump, intake manifold gaskets twice (now with "updated" steel gaskets), throttle body gasket/seal, injector o-rings (upper and lower). Tested all coils for strong spark. Smoke tested for vac leaks along with propane. It has never failed to start or even had a long start and has never died/stalled. I'm just kinda at a loss at this point. Any help will be appreciated and possibly considered. Thanks
    • Khong Thao
      20210712_081902.jpg
      By Khong Thao
    • Khong Thao
      20210712_081429.jpg
      By Khong Thao
    • Khong Thao
      20210721_132447.jpg
      By Khong Thao

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    236.2k
    Total Topics
    1.4m
    Total Posts

  • Member Statistics

    269,321
    Total Members
    8,960
    Most Online
    Zedicus16
    Newest Member
    Zedicus16
    Joined


×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.

  I accept