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. 

Sign in to follow this  
Big R ED

Diagnosis Please (and give it to me straight doc)

Recommended Posts

Patient - 2019 1500 LD, 5.3, 6 sp, 7200 miles old, Covid-19 negative.  Symptoms - 2-3 second shutter / shake / rumble, during light acceleration, 30-40 MPH and low RPM.  Happens while both in V4 mode and while in v8 (manual w/ transmission set to L5).  I thinks its the torque converter, but surfing the forum I see this issue mainly referenced to 2015+/- K2s and I'm not sure if they changed the trans in the final years.  I'd appreciate either a TSB # or a link to another posting were I could find the TSB.  I'd like to be able to take to my dealer and say "HERE....READ....FIX" (politely).  Many thanks!

Edited by Big R ED

Share this post


Link to post
Share on other sites

Unfortunately the bulletins for trans issues don't cover '19 old style, but I'm sure they would apply if the bulletin matches your problem.  These may match your issue.  I cant copy the whole bulletin(s), but it may help.  

 

#PIP5504E: Diagnosing Fishbite Chuggle Misfire Feeling Or Shudder Vibration, With A Light Tip In - (Jun 25, 2020)

 

#18-NA-355: Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed - (Mar 30, 2020)
Subject: 

Shake and/or Shudder During Light Throttle Acceleration Between 25 and 80 MPH (40 and 128 KM/H) at Steady Speed

 

 

#PIP5175D: Slip Or Shudder During A Launch In First Second Third Or Fourth Gears Delayed Engagement Into Drive Clunk Or Bump During The 1-2 Shift - (Jun 8, 2020)
Subject: 

Slip Or Shudder During A Launch In First Second Third Or Fourth Gears Delayed Engagement Into Drive Clunk Or Bump During The 1-2 Shift

 

 

 

Share this post


Link to post
Share on other sites

Many thanks Sliver Sled!  I'll start digging into it.

Share this post


Link to post
Share on other sites
1 hour ago, Big R ED said:

Many thanks Sliver Sled!  I'll start digging into it.

You are welcome.  Good luck with it all.  

Share this post


Link to post
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.

Sign in to follow this  

  • Similar Content

    • By markf1971
      I have a 2004 Chevy Astro van 2WD 4.3L with a 4L60E automatic transmission and something is seriously wrong, but I have yet to figure it out.  I definitely need some help.  I usually do all my own repairs and I am very mechanically inclined, but this has me stumped.  I even consulted a friend who knows a lot more than me and he was puzzled and asked that I share with him what was wrong once it has been diagnosed.  I would probably be willing to drop the big wad of cash down for parts for a remanufactured transmission if needed, or for a remanufactured rear end and new axles.... BUT the van is not worth spending $1,500 (or more) times TWO.  I need to definitively be able diagnose the problem so that I can decide how much I'm going to have to invest to get it going again.  I bought it used from a municipal police department that used it as a crime scene investigation vehicle and it has no hitch on it, so to the best of my knowledge it has never done any towing. Here is what happened and what I have checked thus far....
       
      I pulled out of the driveway at work and after I had cleared the 2 lanes of oncoming traffic and was in the crossover in the median I let off of the accelerator and heard a slap, pop, or bang that sounded like it came from the right, rear corner.  I instantly thought it might be trouble as it sounded like clapping/slapping two solid bricks together.  I hoped it was just something I ran over.  Then I pulled out and accelerated up to 55 mph.  Then about a 1/2 mile down the road I heard what sounded like driving on a tire that was completely flat.  I pulled off the road to check out my tires.  I was surprised when they all looked fine.  I realized something had to be wrong and I wanted to get my van to a better spot where I could investigate further.  I put it in reverse to back up a few feet to better align me with the area I wanted to drive to, but the van would not move backwards.  I wondered if something with my rear brakes had broken or locked up.  I was able to move forward in D, but there was a good amount of resistance as the engine was struggling  to move the van forward.  There was a good clear spot nearby where I parked.
       
      I thought somehow something had broken in the rear brakes and bound things up preventing the van from moving as normal.  I jacked up the van and removed both of the rear wheels, removed the pads & rotors, then propped the calipers out of the way.  I put the transmission in neutral. I replaced the rear wheels as it was easier to rotate the tires by hand than trying to rotate the lugs on the hubs by hand.  The tires spun freely by hand, but after about 10 revolutions  there was a clang noise and the tires stopped.  I rotated the tire in the reverse  direction and it no longer made the driveshaft move as it had been in the forward direction.  Then the clang noise again and the tire stopped rotating in the reverse position.  Both front wheels easily rotated when spun by hand, so the binding wasn't coming from the front
       
      This made me think that it was possibly something going on in the rear end.  I pulled the cover and I saw no obvious problems with the differential.  I have the G80 rear end which I had never seen that type of rear end before.  When I moved my tire forward by hand slowly there was no movement in the rear end, but when I put my foot on the tire and give it a spin the tire moved a lot and the rear end moves a little.  I didn't see anything that looked worn or damaged in the rear end.   I cleaned up the parts, cover, and magnet and put the cover on with a new gasket and replaced the fluid.  While both the rear wheels were still off the ground I cranked the van.  It was still in neutral, but both rear wheels were slowly rotating forward.  Then I shifted into Drive and, with the engine idling, the wheels would pulse several rotations forward, then slow to almost a stop and then repeat the pulse & near stop.  I couldn't  understand why the surge and slow was taking place.  Then, I drove it the 1/2 back to work to leave it in their parking lot.  The van made all sorts of popping, grinding, and clanging noises.  When I stopped I put the transmission in neutral, but it would not roll backwards.  I tried reverse and the nose of the van dived down and the rear bucked up, but the van never traveled any distance in reverse.  I pulled it forward a few feet into the nearest parking space.  The van did throw a MIL code on the way back to work, which was a P0756 (PCM sensed an irregularity in shift solenoid B).
       
      I thought that I might need to remove the driveshaft and see if the transmission would turn the output shaft while in reverse.  Also, I could try to see if there were and weird noises, pulsing, or resistance to the output shift turning when in Drive.  But, I wouldn't necessarily know for sure the tranny was good if it only misbehaved while under a load.
       
      I had ordered a set of shop manuals about a week before all this happened, and they have now arrived but I wanted to see if anyone had any ideas about how to diagnose my problem before I resorted to the shop manuals.  I get bogged down in them because there is soooo much information in them.
       
      How can I definitely determine if the problem is my tranny, my rear end, or both?
       
      Here is a video link on YouTube showing when I had the rear end cover removed:
       
       
       
      Here is a video link showing when the rear end cover and fluid were replaced and both rear wheels were off the ground in Neutral and in Drive with the van running:
       
       
    • By KDP85
      Hey all, so I have a 17 Silverado 5.3. 
      33000km 
      was driving around yesterday.   Truck was at operating temp and trans temp was at 76  so all was good. 
       
       
      it was driving fine, then I got home. And backed into my driveway.  Parked emptied groceries yadda yadda.  5 minutes later realized I had to pull in. Got in, and did just that.   Then 5 minutes later had to run to corner store.  This is when the truck started rough and check engine light started blinking and it was like I had no power.    ( and when I say rough, it was god awful. Like bucking and lurching) Turned around a parked it.  2 hours later drove it 40km and not an issue.   Next morning drive to and from work (7km each way) no issue. 
       
      some say it can be the anti theft , or dirty injectors or worse clips or plugs.     Trucks only got 33k 
       
       
       
      help?!
    • By oscar galindo
      Hi, 
      I have a 1997 c1500 ext cab with the small block 350 and a 4L60e. I’m replacing my torque converter but I don’t know what the original stall on the converter is. Some people tell me it’s around 1400 and other people tell me it’s 1650. Does anyone know the stock stall number? And the bolt diameter too please. 
    • By DJ Morpheus
      Hello all. I own an 18 Silverado 1500 LT , double cab, 6’6” box, 6 spd transmission, I have opted to put 26” status alloy empire wheels with tire size of 305/26/30. Stock transmission gave out. Stock  Transmission went out. They said torque converter and pump went out then everything else went with it. Was able to replace the entire unit with a remanufactured from GM. 1 month later, back to the shop (dealer). They covered the repairs because it was under warranty but if it goes out again they won’t because they believe it is the rims causing the trouble. However they will cover if it goes out with stock wheels. Which I will be putting back on. Has anyone else experienced issues with this type of truck and 26” wheels? I did research the “Unsprung weight” makes some sense, however only the transmission gave out, not my drive shaft, drive shaft knuckles, diff, just the goofy transmission which I know the 8 speed has had their share of ongoing things. How is it that a truck that is capable of towing 9k lbs has issues with no load on 26” rims. Pulling a payload in the bed of the truck and pulling a trailer should still have the same effect. If I can’t tow anything with the truck, then what is the point of a truck. I have went back to stock rims to see what would happen. Anyone with info ,thought , something sketched on a cocktail napkin would be greatly appreciated. I do thank you all for your time on this. I have attached the service ticket to this post. 


    • By Coral
      Has anyone ever tried changing the aluminum line to rubber hose crimps for the transmission and oil cooler lines out for AN fittings on and 07-13 Sierra 5.3L? I have a 2013 Sierra and the cold here in Canada isn’t kind to these crimps as I believe the rubber and aluminum have different shrink rates because of difference in material causing them to leak. Replacing them will not solve the problem as the will just do the same thing every year. So what I want to know is if anyone has successfully done this and what fittings did you use?
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Forum Statistics

    230,447
    Total Topics
    2,461,670
    Total Posts
  • Member Statistics

    229,013
    Total Members
    8,960
    Most Online
    Najar45
    Newest Member
    Najar45
    Joined
  • Who's Online   12 Members, 0 Anonymous, 1,204 Guests (See full list)



×
×
  • Create New...

Important Information

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