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  1. #1

    Default 2012 Silverado transmission not impressed

    Guys and Gals. I bought a 2012 Silverado last year, crew cab 5.3 with the 6 speed auto. I am quite disappointed with it. This thing lugs when accelerating from a slow speed, hunts for gears in traffic, etc. I put it in manual mode just so it'll shift right when driving in town. To get it into passing gear on the highway I have to dick around with the gas pedal or stomp on it to shift up. No codes coming up when I take it for oil change, and the dealership says "hay we can't find anything wrong". My 1996 tahoe (only 75k miles on it) shifts so much tighter and better than this 2012. Only thing I've done to the truck is put a Volant cold air intake kit on it. It has increased overall power but anemic tranny remains. Any advice?
    Attached Thumbnails Attached Thumbnails clean.chevy (640x361).jpg  

  2. #2

    Default

    If you dont like the shift points get a tune. Right now fuel econ is the main thing so that trans will keep the engine at low rpms as long as it can.
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.


  3. #3

    Default

    My 2013 feels slightly slow unless I push the pedal down. I'm used to it and it looks like GM want to keep the PRMs down as much as they can for fuel economy. I'm used to it, and I like that I'm getting combined ~19MPG.

    You can get hand held tuners that you can modify shift points if you wish, just know that your fuel economy will probably suffer.

    2013 Silverado LTZ White Diamond Crew Cab


    Mods:
    Advent OGM1 Navigation
    Husky Liners GearBox Underseat Storage
    Airaid MIT
    EGR Rail Caps
    K&N Air Filter
    Flowsound 40 Muffler
    Hypertech Max Energy Tune (only top end limiter removed and AFM disabled)
    Chrome Tailgate Handle Cover
    TonnoPro HF-155 Tonneau Cover
    WeatherTech Front and Rear Splash Guards
    Husky Liners X-Act Contour Floor Liners
    WeatherTech Side Window Deflectors

  4. #4
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
    Posts
    1,324

    Default

    Quote Originally Posted by vtx1800sba View Post
    Guys and Gals. I bought a 2012 Silverado last year, crew cab 5.3 with the 6 speed auto. I am quite disappointed with it. This thing lugs when accelerating from a slow speed, hunts for gears in traffic, etc. I put it in manual mode just so it'll shift right when driving in town. To get it into passing gear on the highway I have to dick around with the gas pedal or stomp on it to shift up. No codes coming up when I take it for oil change, and the dealership says "hay we can't find anything wrong". My 1996 tahoe (only 75k miles on it) shifts so much tighter and better than this 2012. Only thing I've done to the truck is put a Volant cold air intake kit on it. It has increased overall power but anemic tranny remains. Any advice?
    what to do is get the NON AFM engine. no one with the 1999-2006 vehicles have this issue.

    I am sure you already were told by the dealership service manager that " THEY ALL DO IT ".

    I know of a company that purchased a fleet of 6 cyl vehicles just because of these issues you have. prior to that they had the 5.3 L NON AFM ENGINES.

  5. #5
    Former Member
    Join Date
    Apr 2012
    Location
    Reading, PA
    Posts
    291

    Default

    Quote Originally Posted by shibby2oo8 View Post
    Right now fuel econ is the main thing so that trans will keep the engine at low rpms as long as it can.

    I asked about the low RPM shifts and holding gears too long, I was told it was a reprogramming of the TCM because there were so many complaints regarding too much shifting in the previous versions. I asked this at the dealer I bought the truck from and the local dealer, just to verify...same answer from both. I sometimes wish mine shifted sooner than it does, but as for driveability; I have no other complaints...but its also not an AFM.

    One thing to keep in mind is they aren't a car...as much as we want them to behave like a car, drive like a car, handle like a car...

  6. #6

    Default

    Have you tried running the trans in tow mode?
    Some dealerships recommend trying that vs getting a tune that may or may not void warranty.
    In tow mode the trans will shift at higher rpms and has a more crisp shift.
    The Hydramatic 6L80 is designed to automatically upshif if you mash the pedal and hit 5500rpms.
    But like posted the main design of this trans in any application (AFM or Non AFM) is to reduce fuel consumption by keeping engine rpms low and making use of energy already spent by coasting, notice they dont do a real good job with engine braking?
    The GM powertrain site can give you better specifics on the engine trans capabilitys.
    http://gmpowertrain.com/VehicleEngin...nProducts.aspx

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  8. #7

    Default

    I bought Diablosport Intune for my 2012. I used it to turn off the AFM and retune the Transmission Control Module. It drives much better now, a whole lot closer to my 2005, than it did before.
    2012 Chevy Silverado Crew Cab 2wd
    Magnaflow Muffler
    Factory 20s

    2005 GMC Sierra Ext Cab Stepside 4x4 (Sold)
    4.8 Liter
    Superchips Flashpaq
    Flowmaster 40 Series Dumped
    Moto Metal 951 Black Wheels
    Cranked Torsion Bars

  9. #8

    Default

    Quote Originally Posted by tbplus10 View Post
    Have you tried running the trans in tow mode?
    Some dealerships recommend trying that vs getting a tune that may or may not void warranty.
    In tow mode the trans will shift at higher rpms and has a more crisp shift.
    The Hydramatic 6L80 is designed to automatically upshif if you mash the pedal and hit 5500rpms.
    But like posted the main design of this trans in any application (AFM or Non AFM) is to reduce fuel consumption by keeping engine rpms low and making use of energy already spent by coasting, notice they dont do a real good job with engine braking?
    The GM powertrain site can give you better specifics on the engine trans capabilitys.
    http://gmpowertrain.com/VehicleEngin...nProducts.aspx

    X2 on tow mode, I drive my '05 in tow/haul most of the time until I hit the highway. Gas mileage suffers but I don't really care, its a truck.
    Adam


  10. #9
    Sr. Mechanic
    Join Date
    Oct 2011
    Location
    Salt Lake City, UT
    Posts
    151

    Default

    You can fix this with the Range Technology "black box". It's a shame one has to spend $200.00 but those who purchased it have really been satisfied.
    www.rangetechnology.com

  11. #10

    Default

    I purchased a SCT tuner (gm specific) http://www.sctflash.com/ and turned off the AFM. I normally drive in Tow mode and am slightly happy but a Gear Change will be the kicker for me. Yep the Tranny is the weak link to me being a happy driver of a stock gm truck.
    2010 GMC SIERRA CREW CAB (Silver) 4x4, ReadyLift 2.5" Level Kit, 305/60/18 Dick Cepek Mud Country, Go Rhino Nerf Bars, Husky Liners front and rear, Bushwacker Bed Rail Caps, SCT Programmer.

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