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2021 gmc sierra
Posted on 9/22/23 at 10:56 pm
Posted on 9/22/23 at 10:56 pm
Anyone have fix for hard downshift…feels like vehicle behind you bumps into you
8
Posted on 9/22/23 at 11:16 pm to Jim bean xxx
I’d bring it to dealership if still under warranty. Mine did that randomly until it finally gave out
Posted on 9/23/23 at 3:16 am to Jim bean xxx
quote:
Anyone have fix for hard downshift…
Posted on 9/23/23 at 6:27 am to Craw Dawg
That’s the 10 speed transmission that was designed between GMC and Ford. I had a 2019 F-150 that did same. They tried resetting the adaptive learning. Didn’t resolve. I finally got tired of it and moved on from the truck sadly.
Posted on 9/23/23 at 7:20 am to Jim bean xxx
condolences. There should be a recall on the 8 Spd automatic. I didnt think the 21s had that issue but maybe they do.
Posted on 9/23/23 at 7:52 am to Jim bean xxx
My 19 AT4 is doing this at 70k miles. One thing I was told is a garage can change the transmission fluid and put some type of additive and some people say they have had some success. I will soon try that.
Posted on 9/23/23 at 8:07 am to headboard banger
Trade that bitch in
Posted on 9/23/23 at 8:32 am to Jim bean xxx
Give it another 3-4 months and when this strike starts affecting new truck delivery you can name your price for a low mileage used one
Posted on 9/23/23 at 8:49 am to Jim bean xxx
Take it to dealer and tell them it has issues with torque convertor shudder. They'll swap out the transmission fluid with an improved version and it fixes everything. All done under warranty unless you've blown through the mileage warranty.
Posted on 9/23/23 at 9:09 am to EdOregon
quote:
Take it to dealer and tell them it has issues with torque convertor shudder. They'll swap out the transmission fluid with an improved version and it fixes everything. All done under warranty unless you've blown through the mileage warranty.
Ya, I know it sounds weird that a fluid change can fix it, but that's what it needs. Toyota had this as well.
Posted on 9/23/23 at 10:03 am to Jim bean xxx
We have a 2020 Yukon that was bumping. Dealership said to switch it out of auto 4WD/2WD mode to just 2WD. No bumps since.
Posted on 9/23/23 at 3:28 pm to Popths
My brother 10 speed Chevy had to be replaced after 70,000 miles. My friend 10 speed 21 Ford went thru 3 transmissions before 50,000 miles, was under warranty thankfully. My 18 GMC 6 speed went out after 160,000 miles. But was in and out of shop after 60,000 miles for hard shifting.
Posted on 9/23/23 at 3:47 pm to Jim bean xxx
2020 GMC Sierra 5.3 with the 8 speed. Had to get the Torque Converter replaced at 70,000 miles. I had the extended warranty (7 yr 100,000 mile) so it covered it. I plan to trade it in at 90,000 miles.
Posted on 9/24/23 at 10:47 am to EdOregon
quote:
Take it to dealer and tell them it has issues with torque convertor shudder. They'll swap out the transmission fluid with an improved version and it fixes everything. All done under warranty unless you've blown through the mileage warranty.
It's not a perminate fix. It's a temporary bandaid and can/will come back.
I thought this was inoy on the 2014-2018 models though.
Air gets in the oil and breaks it down. Changing oil fixes it immediately but the cycle continues. There is no permanent fix but to get another vehicle
Posted on 9/25/23 at 10:13 am to reds on reds on reds
Exacly why I avoided buying the premium plus package when I bought my truck so that I could get the 6 spd and avoid the 8spd.
Didn’t matter truck got stolen within the year….
Didn’t matter truck got stolen within the year….
This post was edited on 9/25/23 at 10:16 am
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