Jump to content

transmission issue

mfbearded
 Share

Recommended Posts

econometrics Senior Enthusiast

econometrics

Posted
Posted
1 minute ago, Silverado4x4 said:

Yep you have the trans shutter, mine didn't show up till around 12,000 miles so I took it in and had the trans flush with the new updated fluid and now its as smooth as butter.

 

Thanks, that's encouraging. 

  • Replies 50
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Z45
Z45

Mass production and cost concerns lead to "good enough", but not necessarily the best available. Look at OEM lubes, for example, decent quality, "good enough" quality, but not necessarily the best ava

Swiftks
Swiftks

Enough of this... My 2019 TrailBoss w/ 8-speed goes in to local shop tomorrow and gets full flush and replacement with Amsoil Signature.  Also figured it would be a good time to swap the front and rea

Swiftks
Swiftks

Quick Update... After getting the transmission flushed and all fuilds switched over to Amsoil Signature, the truck does seem to shift and ride smoother.... Could be placebo, only time will tell.

Posted Images

BamX31 Enthusiast

BamX31

Posted
Posted

2019 Sierra 5.3 with the 8 speed trans. At approx 14,000 miles it started slamming into 2nd from 1st and upon stopping at a red ight it would lurch when going from 2nd to 1st. Took it to the dealer with concerns. Bad valve body was the culprit so they changed valve body along with the shift solenoid and transmission fluid and filter change. Only been two days since I got it back it it seams to be shifting the way that it should be.

milkmaster Enthusiast

milkmaster

Posted
Posted

Mine is a new Sierra 5.3 w/8speed tranny built in June 2021.  I should already have the newest fluid right?

SilveradoRST Enthusiast

SilveradoRST

Posted
Posted

Mine was built in Feb 2019.   Only have 10,000 miles, thanks COVID.  Just waiting for shutters and shakes to bring it in for the new ATF.   Drives smooth right now.  In the back of my mind I’m hoping I got lucky and received the new ATF from factory.   But I know March 2019 was when GM switched over.  

SilveradoRST Enthusiast

SilveradoRST

Posted
Posted (edited)
7 hours ago, dgstarr63 said:

The new fluid started being installed in the summer of 2019.


Hopes dashed.  Thanks for the info.   I guess I’ll have to wait for symptoms to appear.  
 

Edit:  The TSB says the cutoff/break point is March 1,  2019.   If they only started using the new ATF in the summer at the factory, are people with build dates between March 2, 2019 to June-ish screwed?

MC-10174268-9999.pdf

Edited by SilveradoRST
Spoogle Enthusiast

Spoogle

Posted
Posted

My transmission was perfectly fine right up until 2 weeks ago, then it ****** the bed completely with just under 20K miles. To make matters worse the dealership had to contact GM for the parts and so far haven't got a response so they can't give me any kind of estimate as to when I'll have a truck again.

Bigfoot98 Enthusiast

Bigfoot98

Posted
Posted
On 8/1/2021 at 11:49 AM, Wiggums said:

I have a 2019 with the 5.3 and 8-speed. I had that done too and it seems to have helped. I still have the morning clunks from cold starts, that part seems incurable.

Id still rather deal with the garage shift and minor harsh shift on a cold start over my f150 trying to activate the ejection seat while it was cold or when it felt like slipping.

  • Haha 1
mfbearded Enthusiast

mfbearded

Posted
  • Author
Posted

Tech at dealer took for it a drive. Immediately knew it needed a flush. Got it done while I waited. I noticed an improvement immediately. Thanks everyone for the input 

  • Like 1
SilveradoRST Enthusiast

SilveradoRST

Posted
Posted
1 hour ago, mfbearded said:

Tech at dealer took for it a drive. Immediately knew it needed a flush. Got it done while I waited. I noticed an improvement immediately. Thanks everyone for the input 

Did the symptoms (hesitation/shudder) show up one day and stay?   Or did it show up here and there and then eventually became consistent?   I had a few rumbles while cruising around 60km/h.  Happened only a couple of times.   3rd time it happened I slowed down and it went away.  But it doesn’t always happen…yet.   

SPASierra Enthusiast

SPASierra

Posted
Posted

Mine has had the harsh downshift in the past, but only first thing in the morning on cool days.  We were on vacation in Myrtle Beach last week and it started doing it consistently while we were in traffic.  Freaked my wife out that we would break down on the way home to PA.  I just passed 31K miles, so I guess it is time to take it to the dealer.  No idea when I will be able to get an appointment because the dealership was hit by a tornado a few weeks ago, which destroyed half of the service department building.  The other local dealer has been slammed ever since.

Swiftks Enthusiast

Swiftks

Posted
Posted

Enough of this... My 2019 TrailBoss w/ 8-speed goes in to local shop tomorrow and gets full flush and replacement with Amsoil Signature.  Also figured it would be a good time to swap the front and rear diff fuilds, as well as the transfer case fuild.  Will update will results after a few days of driving.

20210816_185414.jpg

  • Like 2
Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted
1 hour ago, Swiftks said:

Enough of this... My 2019 TrailBoss w/ 8-speed goes in to local shop tomorrow and gets full flush and replacement with Amsoil Signature.  Also figured it would be a good time to swap the front and rear diff fuilds, as well as the transfer case fuild.  Will update will results after a few days of driving.

20210816_185414.jpg

Please keep us posted.  One customer I know of has had good results when he switched over to AMSOIL fluids in his 8sp.

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

  • Latest Articles

  • Posts

    • KARNUT
      Missing thrust bearing? And oil selection

      By KARNUT · Posted

      I find it amusing the OP doesn’t realize this threads heading includes several engines. He should have posted in the off topic section if he wanted a more narrow focus. I really appreciate and find amusing that he actually pointed out one of my many vehicles. The Odyssey. That happens to use 0-20 oil. I love pushing his buttons. 
    • Black02Silverado
      Missing thrust bearing? And oil selection

      By Black02Silverado · Posted

      Maybe, but it seems he is the only one that has backed up data to prove what he is stating. I think he is doing this more because he enjoys it and wants to get the information out to us. He's got the knowledge and access to the proper equipment and having the funds doesn't hurt.  I would love to do what he is doing and would do it if and when I hit the Powerball.  I'm not a Tribologist by any means but love to learn what I can.   I would bet there would be doubting people out there if a completely independent lab with high quality work and highly respected in the automotive industry, put out information like this.  The world can't be pleased, one just has to take the information that they are given, do more of their own research to find actual lab data to back up what they are trying to figure/find out.  Most don't bother, they just want to believe what they first see.     I don't have the minimax but my 6.2 in my 2019 Silverado with 64k miles shows excellent UOA results with 0w-20 and for my own purposes 5w-20.  Since not much of a change using 5w. I liked the data sheet information on the SS 5w-20 and figured I would give it a try.  Still the same viscosity at 100℃.   In the end we all just do what makes us happy, life is too short to get upset over trivial social media.   On a side note, I do feel GM has dropped the ball and just cares about the bottom dollar and not quality anymore.  "Like a Rock" has been long gone.  Seems "Built Ford Tough" has as well.
    • Tyler Gibbs
      Thoughts on these wheels?

      By Tyler Gibbs · Posted

      Better than stock but that's like putting lipstick on a pig
    • flattop
      2026 sierra bad brake controller

      By flattop · Posted

      Hello, my 3 month old Sierra Elevation wont recognize a trailer with electric brakes? All the lights work correctly, but no power to the brakes?   This is the factory installed brake controller. If you manually push the knob, the display shows the power % but does not light up like my 2022 silverado.   I have an appointment with the dealer, but was checking to see if anyone else has seen this issue.    Thanks, 
    • Black02Silverado
      Post your latest oil change.

      By Black02Silverado · Posted

      Been using SS 0w-20 from new, but wanted to change to the 5w-20 because I liked the data on the data sheet, to me it seems like a little better product. But as you can see, not much difference. This is also with running a mix of 10 gallons E85 to a tank topped with 93. It isn't a flex fuel vehicle so any higher I get a CEL for running lean on both banks. Yes my mileage takes a hit. Instead of 20 mpg I normally get on trips I get 17mpg. This is also using EaO17 filter.  What is amazing is I have the AMSOIL cone filter on it since I have the GM Performance intake installed and that air filter has 44k miles on it.  I just take it out and shop vac it off once a year.  I use the upholstery tool on my shop vac.  Works well.   

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...