RV.Net Open Roads Forum: Tow Vehicles: Transmission shudder

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tow Vehicles

Open Roads Forum  >  Tow Vehicles

 > Transmission shudder

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
Sponsored By:
d1h

Indiana

Senior Member

Joined: 07/06/2006

View Profile



Good Sam RV Club Member


Posted: 07/25/21 08:12pm Link  |  Quote  |  Print  |  Notify Moderator

Anyone have the transmission shudder issue on their Chevy Silverado with the 8 speed tranny? I think my 2018 has started doing it at cruising speed when going down the highway. Going to have to have it checked out. From what I've read about it a transmission fluid change usually solves the problem. Hope that's all it needs. I seen that there was a TSB issued for that problem.

Retired JSO

North Georgia Mountains

Senior Member

Joined: 01/28/2009

View Profile



Posted: 07/26/21 10:03am Link  |  Quote  |  Print  |  Notify Moderator

It is probably caused by the trucks AFM ability when the truck switches to 4 cylinder mode. Several post concerning GM vehicles with AMF. Many forums reporting transmission shutter and lifter problems. The transmission TSB relating to fluid flush addresses what most report as when accelerating, feels like driving over rumble strips.

My 2019 Corvette has had both.





d1h

Indiana

Senior Member

Joined: 07/06/2006

View Profile



Good Sam RV Club Member


Posted: 08/09/21 10:12am Link  |  Quote  |  Print  |  Notify Moderator

Only one reply out of over 350 who have read this post. Interesting, thought it was a more common issue. Anyway, I just had the flush and refill with the new Mobil 1 Synthetic and so far have not felt the shudder. Didn't cost anything to have it done at the dealer. Guy said to give it 500 miles worth of driving to give it time to circulate through the transmission really good. If for some reason it should come back he said torque converter replacement would be next step. Said 99 percent of the time flush and fill solves the problem.

Campfire Time

Wisconsin

Senior Member

Joined: 07/20/2007

View Profile


Offline
Posted: 08/09/21 10:48am Link  |  Quote  |  Print  |  Notify Moderator

Mine had 37k on when I bought it Jan. 2016 Silverado 5.3 with 8 speed. The previous owner had the flush done at 28k. I have 43k on it now. It's been very smooth. I've talked to a lot of people through forums and a few in person who have been very happy with their 8 speeds once the flush was done. And it tows wonderfully, not to mention really good day to day mileage.

There is quirkiness with AFM but I only see it at 45mph and under with a slight vibration. I learned to run in M7 when driving at 45mph or less. No vibration. Locking out AFM eliminates the V4 mode lag. And overall it's even smoother, I no long have wonky downshifts or slams in parking lots.


Chuck D.
“Adventure is just bad planning.” - Roald Amundsen
2013 Jayco X20E Hybrid
2016 Chevy Silverado Crew Cab Z71 LTZ2
2008 GMC Sierra SLE1 Crew Cab Z71 (traded)


dodge guy

Bartlett IL

Senior Member

Joined: 03/23/2004

View Profile


Offline
Posted: 08/09/21 10:52am Link  |  Quote  |  Print  |  Notify Moderator

That’s normally a fluid change. Our Ram truck 8 speeds will hang up in 2nd gear when coming to a stop. Changing the fluid fixes the issue. Anyone that believes in lifetime fluids is asking for a large repair bill. The fluid is expensive, but it’s still cheaper than a trans.


Wife Kim
Son Brandon 17yrs
Daughter Marissa 16yrs
Dog Bailey

12 Forest River Georgetown 350TS Hellwig sway bars, BlueOx TrueCenter stabilizer

13 Ford Explorer Roadmaster Stowmaster 5000, VIP Tow>
A bad day camping is
better than a good day at work!


Grit dog

Black Diamond, WA

Senior Member

Joined: 05/06/2013

View Profile


Online
Posted: 08/09/21 12:16pm Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

That’s normally a fluid change. Our Ram truck 8 speeds will hang up in 2nd gear when coming to a stop. Changing the fluid fixes the issue. Anyone that believes in lifetime fluids is asking for a large repair bill. The fluid is expensive, but it’s still cheaper than a trans.


Sorry for the off topic, but...
What are your real world thoughts on the preferred service (drain n fill or complete fluid replacement) on the 8HP70 behind a SRT8?
Car is 5 years old, approaching 40k miles, wife's summer driver, 99% commuter car, 1% husband done a few good burnouts and a couple top speed runs only.
Also is at absolutely necessary to replace the pan? I don't quite understand why that's a single use item.
I'm considering doing a service on it now around 40k miles since the car has been virtually flawless to date and plan is to keep it a long time.


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29

Campfire Time

Wisconsin

Senior Member

Joined: 07/20/2007

View Profile


Offline
Posted: 08/09/21 02:25pm Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

That’s normally a fluid change. Our Ram truck 8 speeds will hang up in 2nd gear when coming to a stop. Changing the fluid fixes the issue. Anyone that believes in lifetime fluids is asking for a large repair bill. The fluid is expensive, but it’s still cheaper than a trans.


In the case of the GM 8 speed, the 2015-2019 has a TSB for a shudder condition at cruising speeds above 50. The reason is that the transmissions left the factory with the wrong fluid type. It took them until 2019 to figure it out.

https://gm-techlink.com/?p=11127

That said GM maintenance is change of fluid every 45k. Lots of people never follow the engineer's recommendations.

deltabravo

Spokane, WA

Senior Member

Joined: 09/08/2003

View Profile


Offline
Posted: 08/09/21 03:08pm Link  |  Quote  |  Print  |  Notify Moderator

There's a lot of Canyon / Colorado owners with the 8 speed transmission that have the same problem. Fluid change mostly cures the problem, but sometimes the issue comes back.


2009 Silverado 3500HD Dually, D/A, CCLB 4x4 (bought new 8/30/09)
2018 Arctic Fox 992 with an Onan 2500i "quiet" model generator

dodge guy

Bartlett IL

Senior Member

Joined: 03/23/2004

View Profile


Offline
Posted: 08/09/21 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

dodge guy wrote:

That’s normally a fluid change. Our Ram truck 8 speeds will hang up in 2nd gear when coming to a stop. Changing the fluid fixes the issue. Anyone that believes in lifetime fluids is asking for a large repair bill. The fluid is expensive, but it’s still cheaper than a trans.


Sorry for the off topic, but...
What are your real world thoughts on the preferred service (drain n fill or complete fluid replacement) on the 8HP70 behind a SRT8?
Car is 5 years old, approaching 40k miles, wife's summer driver, 99% commuter car, 1% husband done a few good burnouts and a couple top speed runs only.
Also is at absolutely necessary to replace the pan? I don't quite understand why that's a single use item.
I'm considering doing a service on it now around 40k miles since the car has been virtually flawless to date and plan is to keep it a long time.


Actually I just replaced an 8HP70 in a Tack Hawk. The fluid was black at 37k miles. However I believe the failure was the park solenoid. It was diagnosed by another tech in the shop, and I don’t trust his diagnostics (everything gets replaced type). With that though. I would just do a drain and fill a couple times and it should be good. The filter is built into the trans pan and isn’t cheap, that’s why it’s a one time use pan.But at 40k a drain and fill would be all I would do. Maybe do a filter/pan around 60-70k. They are a good trans, but the fluid is the weak point.

ksss

Eastern Idaho

Senior Member

Joined: 02/19/2011

View Profile


Offline
Posted: 08/09/21 06:59pm Link  |  Quote  |  Print  |  Notify Moderator

I had the fluid changed in my wife's 2016 GMC 8 speed. It worked on that truck. Had the same thing done on my 2018 ZR2, it didn't solve that problem. I hated that tranny. Put it in reverse and it wouldn't move for like 5 seconds sometimes. Loved the ZR2, pretty awesome little pickup, but that tranny kinda wrecked it for me.


2020 Chevy 3500 CC 4X4 DRW D/A
2013 Fuzion 342
2011 RZR Desert Tan
2012 Sea Doo GTX 155
2018 Chevy 3500HD CC LB SRW 4X4 D/A
2015 Chevy Camaro ZL1

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Tow Vehicles

 > Transmission shudder
Search:   Advanced Search

Search only in Tow Vehicles


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.