Jump to content

2020 At4 Transmission problems

Joe cox
 Share

Recommended Posts

Joe cox New Member

Joe cox

Posted
Posted

3 week old 2020 At 4.  1100 miles and transmission problems already.  Returned to Ritchey Gmc today for service.  My 2018 gmc had trans problems.   Anyone having same problems?  

4FBB1AEB-5F84-494F-A499-204055B6811F.jpeg

DirtyAndy Enthusiast

DirtyAndy

Posted
Posted

No issues with mine. Only at 225 miles though. Not getting out of 3rd gear is a major problem though.

OnTheReel Senior Enthusiast

OnTheReel

Posted
Posted

Well, it happens. Still can count all of the 10 speed complaints here on one hand. Mine’s been flawless. 

  • Like 1
Jetmek Enthusiast

Jetmek

Posted
Posted

I know that GM and Ford developed the 10 speed trans for these trucks and I don't know the similarities between brands and models. We leased a brand new Explorer late last year. It has less than 5K on it and it has been at the dealership for 3 weeks as of yesterday with the transmission ripped out of it and they are waiting on parts to put it back together. The new Explorers are RWD platforms unlike the previous generation and I assume they use the same 10 speed as an F-150 which can't be too dissimilar to GM's version. Ours developed a violent downshift after being above 45 mph, like turning into our subdivision from a 4 lane highway. It would also have random funky up shifts as well. I haven't talked to the mechanic yet to find out what happened. The service advisor hasn't a clue. I hope you get yours sorted out.

OnTheReel Senior Enthusiast

OnTheReel

Posted
Posted

Co-developed, yes. But the GM and Ford transmissions are each built in their own individual plants with entirely different programming and controls. What happens in a Ford Exploder means nothing for what happens in a GM pickup.

 

I am as shocked as anyone that GM got the 10 speed so right and Ford still has it so wrong, but it’s 100% true.

  • Like 2
Glava2876 Enthusiast

Glava2876

Posted
Posted
15 hours ago, OnTheReel said:

 

I am as shocked as anyone that GM got the 10 speed so right .

I am totally in agreement with this statement. I had a 15 Sierra 6.2 8M, that had some warranty fixed transmission problems, which made it OK and still that way at 50k miles.

I traded it in on a 2020 Sierra 6.2 10M and am blown away with how great this transmission is so far. Nice smooth shifts up and down when cruising around town -but it has fast crisp shifts when you get out on the highway and get into it!

  • Like 1
AdamAT4 Enthusiast

AdamAT4

Posted
Posted
I know that GM and Ford developed the 10 speed trans for these trucks and I don't know the similarities between brands and models. We leased a brand new Explorer late last year. It has less than 5K on it and it has been at the dealership for 3 weeks as of yesterday with the transmission ripped out of it and they are waiting on parts to put it back together. The new Explorers are RWD platforms unlike the previous generation and I assume they use the same 10 speed as an F-150 which can't be too dissimilar to GM's version. Ours developed a violent downshift after being above 45 mph, like turning into our subdivision from a 4 lane highway. It would also have random funky up shifts as well. I haven't talked to the mechanic yet to find out what happened. The service advisor hasn't a clue. I hope you get yours sorted out.
This is my first 10 speed on a GM, I do have experience with the 10 speed on an F150 and it's a very good trans. Buddies are running 600hp Raptors with the 10 speed and 4x4 launches and not one issue.

Sent from my SM-N975W using Tapatalk

Jetmek Enthusiast

Jetmek

Posted
Posted
1 hour ago, AdamAT4 said:

This is my first 10 speed on a GM, I do have experience with the 10 speed on an F150 and it's a very good trans. Buddies are running 600hp Raptors with the 10 speed and 4x4 launches and not one issue.

Sent from my SM-N975W using Tapatalk
 

I've searched around and I can't find any problems with them either. Ours must have come down the line on a Friday at quitting time.

 

Supercup Enthusiast

Supercup

Posted
Posted

I have a 19 AT4 6.2 - 10 spd - 8,500 miles - not a single issue - in fact the tranny is one of the best overall things about this truck - it shifts smooth and has been absolutly seemless!

 

Hope they find a fix for you and you get back to enjoying your truck! 

  • Like 1
DirtyAndy Enthusiast

DirtyAndy

Posted
Posted
The new 10 speeds are junk. Stick with tried and true 8 speed.

My 8 speed drove like garbage compared to this 10 speed. Coupled with the ridiculous throttle lag, I did not enjoy my ‘18 Silverado.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,980
    Total Members
    8,960
    Most Online
    Fishboat
    Newest Member
    Fishboat
    Joined

  • Who's Online   2 Members, 0 Anonymous, 516 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      AFM Experience

      By Grumpy Bear · Posted

      Question @diyer2 on this line if you please. Are you saying the shudder is the system turning on and off at the frequency of the shudder? Guess I'm asking if you are saying you have seen it do this with the bi-direction scan tool in graph mode? If so have you been able to discern the 'trigger'. Something is telling to cycle rapidly.    My truck just started doing this recently. 197K on the clock. My response has been M5 anything under 55 mph. I treat it like a lugging stick shift. Gear down and let it spin a bit. Engauge M5, then tow mode and then M6 lets the trans stay in 5th but the AFM is active. Smooth like Skippy.    My thought was that as a machine ages the friction gets lower and as the system is load based, the lower friction would allow it to turn on at ever lower rpm until it reaches the lugging point. And yes I am ignorant of any minimum rpm requirement for the system. If you know that would be useful information.    As you know I run a Scan-Gauge II which allows me to watch the On/Off of the signal to the VLOM. While in the shudder mode I'm not seeing is cycle at that frequency or at all for that matter outside the triggers @newdude posted a few years back. Now is it possible that the refresh rate isn't fast enough to catch it? Maybe. It is why I asked my first question about graphing and trigging parameter.     As we have observed from members here the failure point is all over the map miles wise as you note yourself in your opening post. That by itself begs a few questions like fellows that comment on these lifters failing even after the system has been disabled. Long after. 😬   https://www.enginelabs.com/news/tech-tips-replacing-ls-active-fuel-management-lifters-with-melling/   The Gen5 lifters operate the same as the LS versions. In fact they are the same lifter.    https://www.enginelabs.com/tech-stories/sorting-out-gen-v-lt-lifter-failure-with-a-simple-valvetrain-fix/        
    • SwitchBladeSierra
      14-18 Sierra 1500 Heated Steering Wheel Help

      By SwitchBladeSierra · Posted

      UPDATE 2: Steering wheel control backlights and control of the cluster can supposedly be achieved by adding a wire to pin 20 of the cluster and tapping it to pin 2 of the main clock spring harness. I'm going to give it a shot - will update  
    • newdude
      Seems to be Missing a lot of Updates

      By newdude · Posted

      GM Global A pickups 2019-2022 can do OTA programming for the radio.  GM VIP (GM Global B) can do OTAs for almost every module on board.  So a 2022.5 and newer pickup can do OTAs for recalls like the 2.7 fuel flow recall.  EVs get OTAs that improve one pedal driving, radio issues, HVAC issues, updated battery management software, etc.     So age of the vehicle/what GM electrical platform its on will alter what amount of updates can be pushed on OTAs.  
    • Blade8971
      Upgrade to a 2026 AT4 with the 3.0L Duramax

      By Blade8971 · Posted

      Thank You.   So far my new ride is making me look like a genius for going with the 3.0L, as my first fuel refill occurred over three weeks from when I took delivery.  This engine combination is very amazing.  So far no issues and had not done a regen yet.
    • Chuck FB
      Correct way to service 2024 l8t allison trans?

      By Chuck FB · Posted

      I am curious as to how much fluid you put back in the transmission ( assuming you had replaced the filter to compare to my findings ) and then went through the process of warming up the trans before pulling the check plug to drain out the excess and if you measured how much came back out.    I just found it surprising that some claimed a certain amount less fluid being put in and then draining some back out. The attitude of the truck as per if the surface is level and how the trucks stance is would make quite a difference since the check plug is right at the front of the transmission. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...