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06-27-2013, 05:19 AM #1
- Join Date
- Oct 2012
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?
06-27-2013, 09:34 AM #2
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.
06-27-2013, 03:11 PM #3
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
Advent OGM1 Navigation
Husky Liners GearBox Underseat Storage
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
06-27-2013, 06:59 PM #4
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.
06-28-2013, 10:59 AM #5
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...
06-28-2013, 03:29 PM #6
- Join Date
- Mar 2007
- Grand Prairie, Texas
- Blog Entries
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.
07-26-2013, 11:12 AM #7
- Join Date
- Dec 2009
- Edmond, OK
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
2005 GMC Sierra Ext Cab Stepside 4x4 (Sold)
Flowmaster 40 Series Dumped
Moto Metal 951 Black Wheels
Cranked Torsion Bars
07-26-2013, 01:28 PM #8
07-26-2013, 01:29 PM #9
07-26-2013, 05:37 PM #10
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.