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

    • Grumpy Bear
      Sugar Bears 2015 GMC Terrain SLE-2 2.4 AWD

      By Grumpy Bear · Posted

      I'm suborn like that Ed. There's a plaque in my doctor office that says, "Don't quit, take a break." Works for allot of things.    Reality is, the wife loves her SUV and even given it's issues, she'd buy another if she found one with low enough miles. Then again she has me to maintain it.    Most of what ails this thing is GM shooting themselves in the foot and by extension the buyer. Besides a ridiculous breather system the cat warm up strategy, IMHO, is the dumbest thing I've ever seen an OEM do to a vehicle they warranty. On cold start it r-e-t-a-r-d-s the ignition to like -17* ATDC and dump fuel like kicking over a pail to force combustion in the CAT's for rapid warm up. This literally hoses the oil off cylinder walls and creates enough varnish precursors to stick rings in even well maintained engines. THEN if that wasn't bad enough they recommend using a wanting fluid specification at equally stupid interval.    Common to all GDI motors I'm aware of is this silly practice of driving the HPFP off the cam giving a leaking pump direct and unchecked access to the crankcase. And sir, eventually the ALL leak. Your job is to "catch it if you can". Yes, these are the same people that removed dipsticks from engines and transmissions in belief Joe Average wasn't capable of checking, reading and maintain his own vehicles fluids. Sadly  and in large they were correct. Most people these days can't tell a sparkplug from a fire plug.  Great ideas one and all.    Every move and every error calculated to defend themselves from the law and their own customers.       
    • Fishindude
      Dash Mat

      By Fishindude · Posted

      Most online suppliers and Amazon. All have noted "not for use with Bose speakers".
    • Coastie05
      Sugar Bears 2015 GMC Terrain SLE-2 2.4 AWD

      By Coastie05 · Posted

      Very interesting thread. Definitely didn’t expect to see this kind of mileage out of that engine. 
    • Grumpy Bear
      J&L OIL SEPARATOR CO

      By Grumpy Bear · Posted

      Just did an injector/HPFP replacement on Pepper at 192,400 miles; close enough to 200K, RIGHT? (If 200K is considered life end and to me it isn't). But hey, to each his own.    Have never run a catch can on this vehicle. Back side of every valve looked like a new valve spray painted semigloss black. Port walls looked 'neat' (all a normal result of passive EGR via VVT) Zero build up even in AFM cylinders. Just color. It uses no measurable oil and never has.    At 155,000 I put her on E-85 and a borescope of the cylinders at plug change showed very clean pistons and valve faces. The replaced injector tips looked new. (It was the pump piston seal that was leaking). Oh well, have six good backups.    Still gets 28 mpg on gas (highway average) and over 20 (highway) on alky. UOA's look good and runs as good now as it did when I bought it. Better in fact.    What improvement would a Catch Can provide this motor?     And given all this I expect that IF I installed one I'd see some water/gas/oil vapor accumulation. Byproducts of normal combustion.   Having said that, IF my motor used an appreciable amount of oil I'd consider it a useful 'crutch' until I had the situation corrected OR if bore polished, until I junked it or rebuilt it to stave off repeated plug fouling.    I'm not telling you what I THINK. But what its DONE.          
    • Grumpy Bear
      Starting a new thread regarding mounting my 2014 OEM wheels to my 2026

      By Grumpy Bear · Posted

      Love the look. I'm a SCSB lover myself.    Two items. 1.) A spacer changes scrub radius but this also changes when we use wheels of different offsets. A little isn't a big deal. 2.) Steel wheels, alloy wheels all have different thickness. Same effect on the stud and lug nut as a spacer. When hub centric the wheel isn't supported by the stud. It's supported by the hub. The stud just keeps it all together.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...