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2011 2500 Hd 6.0 Transmission Shifting Questions

Domano 68

By Domano 68
in Ask A GM Technician

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Domano 68 Enthusiast

Domano 68

Posted
Posted

I'll be purchasing or ordering a 2011 2500 HD Duramax in the next few weeks. I have a question about the new 6 speed transmissions.

 

I just drove a 2500 CC LT 6.0 gasser. The transmission is very sensitive to say the least. I barely touch the pedal to accelerate slightly and it shifts down into the next lowest gear gear. Very different than my 03 HD gasser. Also slowing down, actually coasting to a stop light, you can feel the transmission actually downshift.

 

First question, what is the purpose of this type of set up? I know it cannot help gas mileage but maybe it improves performance and towing?

 

Second question, does the 2011 Allison respond in this manner? I.E. downshift where you can feel it and very sensitive on the throttle? Thanks in advance!

Stevens03 Senior Enthusiast

Stevens03

Posted
Posted

Odd that you can feel it downshift. I will tell you this, I was a nah-sayer against the 6-speed. I just couldn't see how it helped. But let me tell you, I'm a believer. One thing to keep in mind is the 6-speed has adaptive learning which means the more you drive it, the smoother, better it will shift. It adjusts to your driving habits.

 

I drove MANY 6-speeds before actually making a purchase and I'm happy I did.

markw8 Enthusiast

markw8

Posted
Posted

I haven't driven a 6spd gasser, but the allison in my truck is the best transmission I've ever driven. The 6spd helps both for mileage and power for towing/hauling. It has better choices of ratios.

 

Mark

Domano 68 Enthusiast

Domano 68

Posted
  • Author
Posted
I haven't driven a 6spd gasser, but the allison in my truck is the best transmission I've ever driven. The 6spd helps both for mileage and power for towing/hauling. It has better choices of ratios.

 

Mark

 

Can you feel iyour allison downshift as you coast to a stop light for example?

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

its a truck transmission ,i hope you feel some shifts or its a gonner,

 

i never rebuilt one allison as a tranny guy for a northern BC dealer in 3 yrs

 

those things are stupid awesome

topdj Enthusiast

topdj

Posted
Posted

I would have been happy if a Allison + HD version of the LS7 motor was an option :)

 

but I'm quite happy with the 6.0 and 6spd

markw8 Enthusiast

markw8

Posted
Posted
I haven't driven a 6spd gasser, but the allison in my truck is the best transmission I've ever driven. The 6spd helps both for mileage and power for towing/hauling. It has better choices of ratios.

 

Mark

 

Can you feel iyour allison downshift as you coast to a stop light for example?

 

 

I can for sure in tow/haul. Otherwise I don't pay attention to it. If the gasser you drove was in tow/haul you will feel the down shifts. I also think I read that grade braking might be active all the time on the 11 allisons. Maybe the 6/80 also, but don't know.

 

Mark

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