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  1. #1
    Veteran Member deerefan's Avatar
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    Default GM 6 speed auto- Clunky?

    I have a 2011 Silverado 4wd with the 5.3 and 6 spd auto trans. I like the truck, not real sure of the trans. It makes a clunking sound downshifting, done it since new. Dealer checked, all normal. Also, if I hit the brakes, sometimes it will "push" me slightly when downshifting into 1st. Anyone else experience these issues with this tranny?

  2. #2
    Veteran Member crashz's Avatar
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    I'm not sure of they share the same transmissions but my 2500HD has the same issues (6 speed auto). Clunks going from 3rd to 2nd when you slow down enough downshift but have to lightly accelerate a moment later.

    Dealer told me the same thing. When I was trying these trucks out, two of them did it. My old 4 speed did it too. It's irritating, but normal. Or at least common.
    I've had a wonderful evening, but this wasn't it. ~ Groucho Marx

  3. #3
    Silver Member dkhntr04's Avatar
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    Deere 3720 Cab

    Default Re: GM 6 speed auto- Clunky?

    The 6-speed in my '07 2500HD will clunk at low speed/throttle up-shifts from 1-2, or 2-3 now and again. Dealer said nothing is out of the ordinary when I took it in under warranty.

  4. #4
    Veteran Member deerefan's Avatar
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    Good to hear its not isolated to me. It is rather annoying.

  5. #5
    Elite Member Dmace's Avatar
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    Kioti CK20 HST

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    Does it do this in Tow/Haul too?
    Derek
    Kioti CK20HST
    KL120 FEL // KB2365 BH // 60" JRW 3ph snowblower // 48" HD Boxblade
    Sims-Cab Depot heated cab
    Quote Originally Posted by DiamondPilot
    Now it's time for Ford and GM to step up

  6. #6
    Elite Member timswi's Avatar
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    Default Re: GM 6 speed auto- Clunky?

    I have a 6sp in a 2011 GMC 6.2...I don't fund it clunky at all...Sometimes if you catch it between gears on a downhift it can be a little harsh, but that's normal.
    BX23TLB & RTV1100 with 72" Power Angle Plow

  7. #7
    Veteran Member kevinj's Avatar
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    Default Re: GM 6 speed auto- Clunky?

    The engine braking part can seem clunky I guess but mine is an 08 and has been the same since new. Always works fine. GM did have an issue with the trans tailpiece/drive yolk that needs a special grease on the splines or it will clunk if it cannot slide easily.
    Kevin

    BX1860, mower, snowblower - B7500HST, FEL, Bush Hog - Grand L3940 HSTC, FEL, snowblower, 6' Landpride brush hog, 6' King Kutter tiller, Corn Pro 18+5 Fifth Wheel, 1950 Farmall M, Farmall 560D

  8. #8
    Veteran Member deerefan's Avatar
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    Quote Originally Posted by Dmace
    Does it do this in Tow/Haul too?
    Not that I recall.

  9. #9
    Veteran Member deerefan's Avatar
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    Quote Originally Posted by timswi
    I have a 6sp in a 2011 GMC 6.2...I don't fund it clunky at all...Sometimes if you catch it between gears on a downhift it can be a little harsh, but that's normal.
    Yea, that downshift gets me sometimes. Feels like a slight lunge forward, even when brakes are applied. This is my first 6 spd. All other trucks were torque shift fords, 4 spd gm/ford or manual.

  10. #10
    Veteran Member crashz's Avatar
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    Mine has not done it in tow haul either. Won't do it during manual up shifts either.
    I've had a wonderful evening, but this wasn't it. ~ Groucho Marx

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