Jump to content

Loud clunk at deceleration

aha1987
 Share

Recommended Posts

aha1987 Enthusiast

aha1987

Posted
Posted (edited)

Has anyone else heard a loud clunk ( occasionally) when decelerating? It happens right before I come to a complete stop. I believe it happens when the transmission goes into first gear

Edited by Aycock1987
JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
45 minutes ago, Aycock1987 said:

Has anyone else heard a loud clunk ( occasionally) when decelerating? It happens right before I come to a complete stop. I believe it happens when the transmission goes into first gear

Would guess the number of people that have heard their transmission "clunking" would be in the thousands. 

aha1987 Enthusiast

aha1987

Posted
  • Author
Posted (edited)
24 minutes ago, JimCost2014 said:

Would guess the number of people that have heard their transmission "clunking" would be in the thousands. 

It has never done this until this week. I have about 4K miles on It

Edited by Aycock1987
JacobC1983 Enthusiast

JacobC1983

Posted
Posted

I also have a loud popping or clicking noise when the truck goes into first gear right before a stoplight.  It doesn't do it all the time, but it has happened about once a week for a while now.  Truck is at 6000 miles.  I can hear it very well when I drive in the neighborhood with the windows down.

  • 8 months later...
  • 4 months later...
  • 3 months later...
especter Enthusiast

especter

Posted
Posted

I just had this happen to me. This is after I towed a 4300 lb vehicle on a u-haul auto transport for about 120 miles. I dropped off the trailer, drove home, and  it happened to me while decelerating to a stop; shift from 2 to 1 gear. I was able to reproduce it several times after that. I scheduled a service appointment to see a master tech. Any idea what is causing it?

bshort Enthusiast

bshort

Posted
Posted
1 hour ago, especter said:

I just had this happen to me. This is after I towed a 4300 lb vehicle on a u-haul auto transport for about 120 miles. I dropped off the trailer, drove home, and  it happened to me while decelerating to a stop; shift from 2 to 1 gear. I was able to reproduce it several times after that. I scheduled a service appointment to see a master tech. Any idea what is causing it?

Going to be told "operating as designed."  

  • 3 weeks later...
especter Enthusiast

especter

Posted
Posted

I just had the dealership perform the transmission service on my 2019 Sierra 1500 5.3L 8-speed. Service was performed on Tuesday. 

 

Parts included: BG 6600 Transmission Flush kit ($47, includes 106BG & 310BG), Filter (GM Part No. 24274402), and Fluid (GM Part No. 88865601)

 

Issues thus far:

 

Last night I noticed an oil spot in my driveway, put some cardboard under the transmission pan, and drove it to the dealership this morning. They confirmed the pan was "seeping" and blamed it on a defective gasket. 

 

Looking at the parts list, they used the AC delco ATF. Should they be using the Mobile 1 Synthetic LV fluid per the 18-NA-355 bulletin??

 

Any help would be appreciated, because I'm about to blow my gasket..........

@bshort

bshort Enthusiast

bshort

Posted
Posted
17 hours ago, especter said:

 

 

Any help would be appreciated, because I'm about to blow my gasket..........

@bshort

You already did...on the transmission.  ?  One of the reasons that I try to avoid the dealer at all costs....they tend to be somewhat clueless and always seem to F something up.  Sometimes you have to write things out in crayon for the service writer.  Have them use the correct ATF when they change that pan gasket out.  

  • Like 1
especter Enthusiast

especter

Posted
Posted (edited)
2 hours ago, bshort said:

You already did...on the transmission.  ?  One of the reasons that I try to avoid the dealer at all costs....they tend to be somewhat clueless and always seem to F something up.  Sometimes you have to write things out in crayon for the service writer.  Have them use the correct ATF when they change that pan gasket out.  

Oh man, the service writer is completely clueless. I printed, highlight, and showed him all of the relevant GM service bulletins & he completely disregarded them. One bulletin identified that GM does NOT recommend aftermarket additives and fluid flushes for normal service. The other being the procedure for the fluid exchange procedure using the ATF machine w/ 20 quarts of the Mobile Synthetic ATF HP fluid. 

 

Eventually, after not being able to deal with me any longer he called over the shop foreman  & we had an in depth conversation about the 8 speed transmission bulletins. FINALLY, they agreed to use the Mobile 1 Synthetic ATF HP fluid (blue label). 

 

Fingers crossed for smooth operation and no leaks when I pick up the truck later today........

MC-10159572-9999.pdf

MC-10163241-9999.pdf

Edited by especter

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
      The Peckish Synapse

      By Grumpy Bear · Posted

      Breaking News!    I'm going to tell you that I'm going to tell you.  Then I'm going to tell you what I'm going to tell you.  Then I'm going to tell you.  Then I'm going to tell you what I told  you.  Then I'm going to tell you what I'm about to tell you on the other side of the break.  Then we're going to break. Then I'm not going to tell you what I told you I was going to tell you.  But I'll tell you something else that is Breaking News just coming to the desk that everyone reported on yesterday.  Then I'll tease a human interest telling I'll get to on the other side of a larger break. Then I'll tell you one item in 20 seconds and go back to an even longer break. Longest break of the night.  Then I'll tell you a fluff piece that takes 10 seconds and sign off into a three minute break while you wait for the next 30 minutes of rinse and repeat on the local news.    In al you'll get about 12 minutes of something, 5 minutes of which is worth hearing in a 30 minute show and 18 minutes of advertising at a sound level twice as loud as the news.    Of course you can switch to cable news and hear 12 different people tell the same four stories in much the same format as the Network News for 20 hours of which the majority will be advertising.  And four hours of late night Specials about things you wonder why you stayed up to listen to. Half of which will be repeats.....   OR you can go for a drive  
    • Afennell19
      Audio Dampening and quiet

      By Afennell19 · Posted

      Did you ever figure this out? My 2022 Trail Boss, and now my 2026 LT did this from time to time.  I believe it was more connected to Android Auto and my phone being the cause. Maybe try going for a drive, sans cell phone.... and see if it happens? 
    • Afennell19
      2026 Sierra 1500 Denali - Sound upgrade?

      By Afennell19 · Posted

      I have a 2026 Silverado LT, the non bose as well.  Upgrading the door speakers is pretty straightforward. You could honestly go to walmart, or Auto Zone/ O Reilly and get a set of 6x9s for the front, and 6.5s for the rear. You do also have to get some adapters for each, but they are like $10 a pair on Amazon. Then some plug and play harnesses that are about $10 a pair on Amazon as well.  And I would also suggest a 10 pack of the Amazon Basics sound deadening. Slap that all around the speakers and on the open metal of the inside of the door. And your golden.   I am currently doing this with my Silverado. Although I am having a bit of trouble because I am snooby I guess and bought some Alpine S2 S69c's which are 2 way components and I am having to wire from the door up to the dash....  Having never installed speakers before, its taking me just a bit to get everything correct. But if you dont buy expensive component speakers, and just some $40-$50 door speakers. You will DRASTICALLY improve the sound over these stock paper cone junk speakers. I thought my Silverado had an issue with the radio/ sound for a while.  Come to find out.  The stock speakers are just THAT SH*TTY   I cannot wait to have some decent sound in the truck   What did you end up doing?
    • newdude
      Parking Brake - Automatic Engagement Questions

      By newdude · Posted

      Its all automatic based on yaw sensor data.  If enough incline is detected, it engages.   My recommendation though would be to disengage it before driving off and not let it auto disengage by touching the gas pedal.  The HD trucks use the same setup as prior years, the drum in hat park brake.  But now with an electric actuator.  If you drive off repeatedly over time, it can torque the park brake shoes and can also prematurely wear them out.           Electric console shift will set the park brake on flat ground too.  Pretty sure they've got it programmed to activate every time.  
    • riddler
      Supercharger (whipple)

      By riddler · Posted

      Anyone install a a supercharger on your 6.6L L8T? Talk to me...

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...