8spd issues

[SilveradoRST]

42 minutes ago, TNTSilverado said:

I have a buddy that has a 2017 5.3L with 8 spd and he says he has cold hard shifts but if he remote starts it and let’s it sit for 5 mins to warm up the truck doesn’t hesitate or have the hard shifts.   Anyone else verify this??  
 

Yup, warmup does the trick for me as well.  
 

10 speed doesn’t seem to suffer from this cold hard shift issue.  At least nobody has mentioned it here.  

[TNTSierra]

13 minutes ago, SilveradoRST said:

Yup, warmup does the trick for me as well.  
 

10 speed doesn’t seem to suffer from this cold hard shift issue.  At least nobody has mentioned it here.  

No I have never had a hard shift. Even now when weather is 10 degrees here in Iowa. It shifts great. Can’t believe a simple warm up would do wonders. Go figure. 

[SilveradoRST]

20 minutes ago, TNTSilverado said:

No I have never had a hard shift. Even now when weather is 10 degrees here in Iowa. It shifts great. Can’t believe a simple warm up would do wonders. Go figure. 

So first thing in the morning, you get in and go, no issue?  Not even elevated rpms or some sluggishness?

 

My wife’s Traverse with the fwd 9 speed feels a bit sluggish at first when it is cold.  When no clunks.  But once it’s warm they all feel smooth.  

[TNTSierra]

13 minutes ago, SilveradoRST said:

So first thing in the morning, you get in and go, no issue?  Not even elevated rpms or some sluggishness?

 

My wife’s Traverse with the fwd 9 speed feels a bit sluggish at first when it is cold.  When no clunks.  But once it’s warm they all feel smooth.  

Nope none. I just bought my wife a new 2020 Acadia with 9 spd and haven’t had any issues with it either. 3600 miles on it right now
 

my mother has had her 2018 enclave 9 spd for 2 years and they had to flush it right away with 500 miles on it because it would hesitate, been great since then. She has around 15k on it now. 

[SilveradoRST]

I know it’s an easy fix of a 5 minute warmup to avoid clunks.  But I would get the 10 speed just to avoid having to do that.  Would be nice to just get it and go in the mornings.  
 

Wish they would do something to “fix” the 8 so warmups aren’t necessary.  

[TeamSaris]

1 hour ago, SilveradoRST said:

I know it’s an easy fix of a 5 minute warmup to avoid clunks.  But I would get the 10 speed just to avoid having to do that.  Would be nice to just get it and go in the mornings.  
 

Wish they would do something to “fix” the 8 so warmups aren’t necessary.  

The fluid change TSB helped my truck quite a bit. I did hear it comes back after a month or so though.

[UGADawgs]

Even with it being 80 degrees here in Florida, still have to get it to operating temp to avoid it or just say f it and just start and go and deal with the lunge. 

[Swofford]

Old Silverado owner, new to the forum, as I just traded my 2007 Classic crew cab in on a 2020 LT Z71 Double Cab.... question... has anyone that has had a problem with their 8-speed actually had it fixed/resolved to satisfaction by GM/Chevy/dealership? The reason I ask is that the truck I just bought (5.3/8spd/ CPO used) didn't get but a couple of miles down the road before it had a couple of issues and I took it back to be looked at. What happened was that the dash warning messages started chiming and saying to service the supplemental restraint system with the airbag light... this flashed a number of times.... Additionally, when I approached a full stop, just prior to actually stopping, there was a good sized jerk/thump, which I assume is the transmission doing a hard downshift. At one point it did the thump multiple times just before we stopped. It almost feels like you are being bumped by another vehicle from the rear end... 

 

I don't want to have comments that grind old axes on this... I just want to find out if people are actually able to get this resolved (if what I am describing is really a transmission issue)... I am giving the dealership 2 days to try to resolve, but still have time to back out the deal I made. I really like the truck... it is just I don't want to be spending a ton of time having to take it to the dealership for problem solving...

 

Thanks, in advance, for any construction responses.

Larry

[Swofford]

Well, still hoping to get a response to this... The dealership has had the truck since 1/5/21... I picked it up late 1/4/21... so I drove it 40 miles and took it in to be looked at. I got an update call from the Sales Director for the dealership... He is saying they are having their 'transmission master expert' continue to look at it... and what was supposed to have taken 2 days to do analysis is now looking like it is going to take another week...at least... This is not a good start... I really don't want to complain... but I would like to be able to drive what I am paying for...

[Weimrunner]

Live in Iowa and just traded my 2019 at4 due to this problem. Last 2 years when it gets cold and til spring my truck coming out of my driveway and leaving work would shift hard between 1st and second everyday when temp below 40 degrees. You could let the truck cycle through 2 starts and it would still do it. The fluid needed to build pressure while moving. The truck routinely would stutter went coming to a stop as it was trying to find the right gear. Had to dealer 3 different times and called gmc and they would do nothing. They told me and printed a service bulletin and gave me a copy that said it was normal. I tried living with it cause the truck was awesome other than the cold shift. I was so mad 3 weeks ago when gmc rep called and said they talked to the dealer and the dealer said it was normal operation and was fixed. I went off. Said your telling me it is normal for a 60,000$ truck is supposed to shift hard and damn near throw you through the windshield when it grabs and you call that normal. She was quite and started apologizing. That pissed me off. It is not like the days of actually talking to a factory rep but now we talk to an answering service and doesn’t escalate higher. I kept to gmc and bought another At4 with a 10 speed an couldn’t be happier with the tranny I got.

[SummitWhiteT1]

I just traded my ‘19 LT for a ‘21 RST and both have the 5.3 8speed. The new one however shifts way smoother. I used to get the shudder when switching from reverse to drive sometimes or the 1-2 downshift problems. Now I have absolutely no problems at all. I drove a trail boss before buying my RST and I honestly couldn’t tell much of a difference other than having 2 extra gears. My ‘19 was a late build too, it was manufactured about 5months after GM supposedly started putting the new fluid from the factory and the TSB or w/e should have been done way before I ever bought it but it still drove like crap compared to my new 8speed


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[SilveradoRST]

1 hour ago, SummitWhiteT1 said:

I just traded my ‘19 LT for a ‘21 RST and both have the 5.3 8speed. The new one however shifts way smoother. I used to get the shudder when switching from reverse to drive sometimes or the 1-2 downshift problems. Now I have absolutely no problems at all. I drove a trail boss before buying my RST and I honestly couldn’t tell much of a difference other than having 2 extra gears. My ‘19 was a late build too, it was manufactured about 5months after GM supposedly started putting the new fluid from the factory and the TSB or w/e should have been done way before I ever bought it but it still drove like crap compared to my new 8speed


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Did the ‘21 8-speed eliminate the cold morning 1-2 hard shift?

[SummitWhiteT1]

Yes, never had a hard shift so far wether I warmed it up or not. 3,000 miles and smooth as butter


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[SilveradoRST]

3 hours ago, SummitWhiteT1 said:

Yes, never had a hard shift so far wether I warmed it up or not. 3,000 miles and smooth as butter


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Good to hear.   Cold hard 1-2 shifts is my only gripe with my truck.  

Edited January 9, 2021 by SilveradoRST

[CamaroVetteGuy]

On 1/6/2021 at 10:03 AM, Swofford said:

Old Silverado owner, new to the forum, as I just traded my 2007 Classic crew cab in on a 2020 LT Z71 Double Cab.... question... has anyone that has had a problem with their 8-speed actually had it fixed/resolved to satisfaction by GM/Chevy/dealership? The reason I ask is that the truck I just bought (5.3/8spd/ CPO used) didn't get but a couple of miles down the road before it had a couple of issues and I took it back to be looked at. What happened was that the dash warning messages started chiming and saying to service the supplemental restraint system with the airbag light... this flashed a number of times.... Additionally, when I approached a full stop, just prior to actually stopping, there was a good sized jerk/thump, which I assume is the transmission doing a hard downshift. At one point it did the thump multiple times just before we stopped. It almost feels like you are being bumped by another vehicle from the rear end... 

 

I don't want to have comments that grind old axes on this... I just want to find out if people are actually able to get this resolved (if what I am describing is really a transmission issue)... I am giving the dealership 2 days to try to resolve, but still have time to back out the deal I made. I really like the truck... it is just I don't want to be spending a ton of time having to take it to the dealership for problem solving...

 

Thanks, in advance, for any construction responses.

Larry

Back out!!!