8spd issues

TeamSaris · December 28, 2020

Trading my 8spd for a 10spd this week.

But, since the transmission fluid was changed and some kind of TSB done for the cold hesitation, I have to say its been a lot better.

Jac365 · December 29, 2020

24 minutes ago, TeamSaris said:

Trading my 8spd for a 10spd this week.

But, since the transmission fluid was changed and some kind of TSB done for the cold hesitation, I have to say its been a lot better.

What is "the cold hesitation"?

RWTJR · December 29, 2020

5 hours ago, UGADawgs said:

My 2019 5.3/8-speed has been acting up lately. It seems like it is hunting gears when it shouldn't be shifting. Going to take it in this week and see if they'll change the ATF under the TSB.

https://static.nhtsa.gov/odi/tsbs/2020/MC-10174268-9999.pdf

Don't be surprised if they refuse to perform a TSB for transmission shudder on a vehicle that is not experiencing shudder. You may have an issue that is repairable under warranty but if it's not shudder this TSB doesn't apply.

My previous truck was a 2018 Colorado with the 8 speed and some Colorado owners tried getting non-shudder issues addressed by the 18-NA-355 TSB, https://static.nhtsa.gov/odi/tsbs/2019/MC-10163890-9999.pdf , (same issue, earlier TSB) and almost always were denied. Some would complain of harsh shifting and the dealer would say No to the TSB. Many who had shudder reported shift improvement in addition to shudder elimination after the TSB. The July 08, 2019 update of the TSB removed the requirement for PicoScope testing or other diagnosis beyond owner complaint of Shudder BUT it had to be a complaint of shudder (not gear hunting).

Good luck. Let us know what they say.

JMHO

No expertise implied or expressed

UGADawgs · December 29, 2020

9 hours ago, RWTJR said:

Don't be surprised if they refuse to perform a TSB for transmission shudder on a vehicle that is not experiencing shudder. You may have an issue that is repairable under warranty but if it's not shudder this TSB doesn't apply.

My previous truck was a 2018 Colorado with the 8 speed and some Colorado owners tried getting non-shudder issues addressed by the 18-NA-355 TSB, https://static.nhtsa.gov/odi/tsbs/2019/MC-10163890-9999.pdf , (same issue, earlier TSB) and almost always were denied. Some would complain of harsh shifting and the dealer would say No to the TSB. Many who had shudder reported shift improvement in addition to shudder elimination after the TSB. The July 08, 2019 update of the TSB removed the requirement for PicoScope testing or other diagnosis beyond owner complaint of Shudder BUT it had to be a complaint of shudder (not gear hunting).

Good luck. Let us know what they say.

JMHO

No expertise implied or expressed

I mentioned the gear hunting because the truck was shaking and the RPMs were fluttering slightly at constant speed. I will describe it as shudder per the TSB when dropping it off and have it printed to hand to the service writer. I'll let you guys know either way.

TeamSaris · December 29, 2020

11 hours ago, Jac365 said:

What is "the cold hesitation"?

When the truck is cold it feels like the trans finds neutral between first and second. The whole truck "lurches". Sometimes bad, sometimes not bad. It has gotten a lot better since the last update and transmission fluid change, the truck runs great too. I just didnt want any issues down the road. I was adamant my new truck had the 5.3 10spd.

CamaroVetteGuy · December 29, 2020

19 TB built in May 2019. 8 speed. No issues.

UGADawgs · December 30, 2020

Dropped it off today and told them about the hard shift between 1 & 2 when cold and the random shutter during acceleration and they changed the fluid per the TSB without asking questions.

SilveradoRST · December 30, 2020

40 minutes ago, UGADawgs said:

Dropped it off today and told them about the hard shift between 1 & 2 when cold and the random shutter during acceleration and they changed the fluid per the TSB without asking questions.

Let us know if it improves the cold 1-2 hard shift.

David DeSouza · January 1, 2021

My new company truck is a 8spd 5.3 4x4, my previous company truck was a 2013 f150 5.0 4x4! Last week I was towing a trailer about 6k lbs, I've towed the same load many times with the ford, 65-70mph country roads with smalls hills! Going down a grade or coming to a stop the ford had aggressive engine breaking and the Silverado doesn't seem to want to downshift to allow engine breaking! Both in tow haul mode, I would set cruise on the Silverado and it would exceed the cruise set point by 10mph going down hill and the f150 would not go any higher then 3mph over the set point!

Besides that I have really enjoyed driving the Silverado, I'm ready to upgrade my personal vehicle! I have always had Toyota's but thinking about jumping ship this time around!

David DeSouza · January 1, 2021

On 12/28/2020 at 3:33 PM, BlancoSilverado said:

Check out the Sierra, you can get the 10 speed in the SLE (1 up from base, assuming crew cab, 4wd, short bed). 50k msrp, probably 42k out the door.

Thanks didn't know that, and theirs a few for 41k locally, sounds like a better option over getting the Texas edition.

UGADawgs · January 1, 2021

On 12/30/2020 at 5:59 PM, SilveradoRST said:

Let us know if it improves the cold 1-2 hard shift.

Negative, no affect, still have it.

TNTSierra · January 1, 2021

2 hours ago, UGADawgs said:

Negative, no affect, still have it.

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??

UGADawgs · January 1, 2021

22 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??

yeah, if I wait for it to warm up, it won't do the cold 1-2 shift lunge.

UGADawgs · January 1, 2021

12 minutes ago, UGADawgs said:

yeah, if I wait for it to warm up, it won't do the cold 1-2 shift lunge.

To describe it, it is like the truck goes to speed up and is then slightly being pulled back by tug rope and then it releases and it lunges and drives normally.

TNTSierra · January 1, 2021

Owe I know. I had a 2018 8 spd with 6.2L. Absolutely loved the truck but couldn’t stand the clunking. My truck did this all the time. If I had known I could have let it warm up a bit and it wouldn’t happen. Might have kept me from trading it in, but then again, after driving the 10 spd it was a done deal.
Seems to me like a simple fix?? Start it and let it run a few minutes.