Who has the Chevy 8sp transmission?

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  • KJQ6945

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    In 2018 I bought a new Silverado 1500. 6.2 v8 with an 8sp transmisson. It’s been an excellent vehicle. lately, it’s developed an issue. Between 50 and 70, it intermittently feels like you are driving over rumble strips. A little Google search reveals this is a common issue, and GM is being sued over it. Who knew?

    anybody else have this issue?
     

    gll

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    My 2021 Colorado 3.6L has the 8L45 transmission... Is that the problematic one?
     

    KJQ6945

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    My 2021 Colorado 3.6L has the 8L45 transmission... Is that the problematic one?
    Yes sir, I believe so. It appears that the trans is in the Corvette, Camaro SS, Silverado and the Canyon.
    Google lists plenty of threads on complaints. Have you had any issues?
     

    gll

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    I barely have 4000 miles on it, but the one issue I've had is with a load of feed over 4 or 500lbs. Then it shudders at 40 or 50mph..., badly

    My ex-Chevy mechanic brother thought it might be poor differential alignment, but this makes me wonder. I've been waiting until my first oil change to have Chevrolet look at it, but I might address it sooner!
     

    KJQ6945

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    I barely have 4000 miles on it, but the one issue I've had is with a load of feed over 4 or 500lbs. Then it shudders at 40 or 50mph..., badly

    My ex-Chevy mechanic brother thought it might be poor differential alignment, but this makes me wonder. I've been waiting until my first oil change to have Chevrolet look at it, but I might address it sooner!
    The shudder basically boils down to a torque converter lockup issue. If you google it, there’s lots of information. I’m taking mine to the dealership in the morning. Just wanted to see what TGT knew first.
     
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    lonestardiver

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    The fix is to replace the transmission fluid per the TSB. The original fluid is hydroscopic and absorbs water. Had this done on my truck and the problem went away. GM/Chevy dealers have a special machine to do this fuild swap. Mine had a very noticeable shudder that was only apparent when the transmission temp got to 170 degrees or so.
     

    Brains

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    I had the issue in my old Camaro as well, it's the lockup clutch not being applied with sufficient pressure in an attempt to try and save fuel. Early on before they understood what the cause was, they first did a converter under warranty. Fixed it for a while. The shudder came back, so they did a fluid change which again fixed it for a while. The shudder was still there with the different fluid, but not nearly as pronounced and it didn't occur until the trans temps came up.
     

    KJQ6945

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    The fix is to replace the transmission fluid per the TSB. The original fluid is hydroscopic and absorbs water. Had this done on my truck and the problem went away. GM/Chevy dealers have a special machine to do this fuild swap. Mine had a very noticeable shudder that was only apparent when the transmission temp got to 170 degrees or so.
    How long ago did you have the transmission flushed?
    Lots of people complaining online that the flush is just a temporary fix, and the issues return.

    I’m hoping that the fluid change eliminates the problem permanently, but I’m a little skeptical.
     
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    Brains

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    If you want a permanent fix, find a good performance shop that deals with GM vehicles. They can update the TCM calibration to change the lockup clutch apply strategy and permanently fix it. The downside is it will void the warranty on the transmission.
     
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