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New to the forum, anyone else have this issue?

Cross88

By Cross88
in 6.6L Gas V8 (L8T)

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Cross88 New Member

Cross88

Posted
Posted

Hello everyone, new to the forum, I’ve got a crew cab 2wd ltz 6.6 gas. Was wondering if anyone else has had an issue with their transmission, specifically the 2-1 downshift. Mine seems to shift pretty rough most time. Haven’t taken it in yet, been putting it off cuz I need the truck. Trucks purpose is daily driver and tow pig. I have a fifth wheel, but it’s only about 50% of the trucks capacity. Any thoughts, advice? Thank you

F1A02B2A-24CE-42C8-BFB1-94937CC4571B.jpeg

2020_3500HD Enthusiast

2020_3500HD

Posted
Posted

I have had it a few time but only during extremely hard braking, my 09 2500 with the 6l90 would do the same and got 250,000 trouble free miles from it.  

Cross88 New Member

Cross88

Posted
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Posted

Well that’s good, hopefully I’m trouble free for a long while also. It doesn’t do it all the time, and sometimes it’s worse than others. So who knows. I have less than 4K on it now. Here’s to hoping it figures itself out.

Stand By Enthusiast

Stand By

Posted
Posted

I've had it a few times slowing quickly while turning. Feels like a normal gm transmission characteristic to me.

  • 8 months later...
SteveSr New Member

SteveSr

Posted
Posted

I have a 2021 2500 HD with a 6.6 gasoline as I am coasting up slight inclines with my foot off of the accelerator as it down shifts sometimes I get a loud clunk I don't like it either but haven't took it in yet

  • 10 months later...
millews New Member

millews

Posted
Posted
On 5/20/2021 at 2:08 PM, SteveSr said:

I have a 2021 2500 HD with a 6.6 gasoline as I am coasting up slight inclines with my foot off of the accelerator as it down shifts sometimes I get a loud clunk I don't like it either but haven't took it in yet

Did you ever get this resolved? I have been dealing with the same issue for months. I am taking back to dealer tomorrow and will drive to show and feel he problem. You literally have scream at them to fix warranty issues.

Ray Pickle Enthusiast

Ray Pickle

Posted
Posted

Without experiencing your truck's specific symptoms its hard to ascertain if it is normal drivetrain "slop". I will say that the length of driveline and rear diff setup will cause a minor clunk under certain downshift parameters. I notice it is most consistent slowing and turning as someone else has already mentioned. 

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