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"Revised" 6-speed

MotoMedic

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'01LS1 Senior Enthusiast

'01LS1

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The normal, no code, bucking and jerking of my 09 on decel from 50- 40 mph is just my perception not the pos trans and programming, now I understand. Been to dealer many times on the matter.

 

I have seen this complaint on all truck related forums or news sites from all half ton & up mfg's over the past 2/3 years. Have not noticed my truck doing the same or anything out of the ordinary. Would imagine the base cause for the issue is programming designed to force the trans in the highest gear possible at the lowest rpm for the hags at the EPA.

Bravo1 Enthusiast

Bravo1

Posted
Posted

MotoMedic did you can tire size on the stock 20 rims I see you are running 33'.Might ask the GM tech if it allows for tire size changes in the ECM.

MikeNH Senior Enthusiast

MikeNH

Posted
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I would spend extra if they would put the Allison in the 1/2 tons. It's the best shifting transmission built.

 

An HD trans in a light duty truck would drive horrible. Too much parasitic loss.

MotoMedic Senior Enthusiast

MotoMedic

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MotoMedic did you can tire size on the stock 20 rims I see you are running 33'.Might ask the GM tech if it allows for tire size changes in the ECM.

I'd recommend not altering the ECM. Assuming your speedometer is 100% accurate with factory tires, switching to 33's will mean at 75 MPH you're actually doing 77.5 MPH. And as the tires wear down, your speedo will only become more accurate.

I know in my old GMT-900, after about 15k miles on my 33's, my speedo reading was identical to my Garmin at 75 MPH.

  • 1 month later...
MotoMedic Senior Enthusiast

MotoMedic

Posted
  • Author
Posted

From a GM employee:

"What you are probably feeling with your coasting downshifts is that we are leaving the torque converter applied during the shifts. We do this because if the trans is backdriving the engine, the engine can reduce the amount of fuel the engine is getting to make fuel economy better.

The shifts should get a bit better in feel with miles, but will probably not get to the same feel (or lack of feel) that an older truck may have had.I can not go into any more technical detail than this without losing my job, but suffice to say that what you are feeling is not something wrong with the vehicle. Hopefully your comments are more that the truck is 'different' than 'bad' in this area."

Stex Senior Enthusiast

Stex

Posted
Posted

Yep, first in class MPG #s. Drivability issues? Yes we give you those too. Even after, Justin and an 89 oct tune, my 5.3 still bucks on decel around 45 mph etc...my friends 5.0 ford has no such issues. His 5.4 did not either and I drove it a lot.

Stex Senior Enthusiast

Stex

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I have 6500 miles on mine. These transmission issues will go away, or at least mine have.

 

Please keep the feed back coming. I am very leery to drop coin on a '14 an still have a drivability issue like my 09.

crushNchowda Senior Enthusiast

crushNchowda

Posted
Posted

I had similar feeling w/ tranny "shudder" it has since gotten progressively better over time/mileage. I now have 3,600 miles and it should be getting used to my driving style. When I find a tuner who can give me a quality engine/tranny tune while installing some 3.73's I'll be happier.

Stex Senior Enthusiast

Stex

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Have to love trading driveability for fuel economy in a truck. :rolleyes:

 

Best said yet!

Joe_K Enthusiast

Joe_K

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I have 1300 on mine now and it really does adjust to your driving style. I came from the awful Ram 65RFE, so right from the start I felt the 6L80 was much better than my old truck. For anyone complaining, go drive a Hemi Ram with the old 5/6 speed, and you'll look forward to getting back in your 2014 GM truck.

Stex Senior Enthusiast

Stex

Posted
Posted

Feel much better about the '14 drive train after my 2nd extended test drive. Shift up and down was a lot like my Justin 89 tune and you could feel the extra T/Q and some hp as I keep the revs low. will report some more later in a thread,

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