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Allison 6 speed for 2006

tbyrne

By tbyrne
in 2000-2014 Silverado HD & Sierra HD

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tbyrne Senior Enthusiast

tbyrne

Posted
Posted

This should be cool!

 

Getting To Know The Allison Automatic -

 

The smart choice is the smart transmission: An Allison automatic transmission. Advanced electronic controls enable constant communication and feedback between engine and transmission, resulting in more precise, more efficient, faster, smoother, fully automatic shifts. With technology to match its legendary durability, the Allison Automatic is the perfect match

for GM's 8.1-liter Vortecgas and 6.6-liter Duramaxdiesel engines.

The following descriptions will help you better understand and appreciate the special features and benefits of an Allison automatic transmission.

 

Range Selection Mode -

 

The Allison equipped Silverado/Sierra HD Pickup Truck is the first application of a six speed automatic transmissionfor this class of vehicle.

For ease of operation and to facilitate all your driving, towingand hauling needs, a Range Selection Mode has been added to the column shift lever.

To enable the Range Selection feature, simply move the column shift lever to the Mposition. The Driver’s Information Center will then show the six available ranges with the current range bracketed. The bracketed range is the highest attainable range with all gears below accessible (i.e. when 4this selected, ranges 1stthrough 4thare available).

 

By using the +/- button located on the column shift lever, the Driver can select the range of gears they desire for their current driving conditions, providing peace of mind and control. Range Selection Mode also gives the driver the ability to control engine and vehicle speed while going down a hill by enabling them to select their preferred range.

Note: Grade Braking is not availablewhen Range Selection Mode is active (See the Grade Braking & Cruise Grade Braking section for details).

While using the Range Selection feature, Cruise Control and Tow/Haul are available for the Driver's convenience.

 

Grade Braking & Cruise Grade -

 

Braking/Starting with the 2006 Model Year, Grade Braking and Cruise Grade Braking will only be active while the Tow/Haul Mode is selected and the driver is not in the Range Selection Mode (See the Tow/Haul Mode and Range Selection Mode sections for details).Grade Braking and Cruise Grade Braking will assist in maintaining desired vehicle speeds when driving on downhill grades by automatically implementing a shift schedule that utilizes the engine and transmission to slow the vehicle, which reduces wear on the traditional braking system and increases vehicle control.Grade Braking monitors vehicle speed, acceleration, engine torque and brake pedal usage. Using this information, it detects when the truck is on a downhill grade and the driver desires to slow the vehicle by pressing the brake.

 

Cruise Grade Braking is a 6.6L Duramax diesel feature only. Cruise Grade Braking monitors cruise state, engine torque, acceleration, vehicle speed and cruise set speed. Using this information, it detects when the truck is accelerating on a downhill grade and will automatically downshift to slow the vehicle if it exceeds the cruise set speed by a certain amount.Tow/Haul ModeTow/Haul is activated and deactivated by pressing the button at the end of the column shift lever. It significantly changes the transmission’s shift pattern to reduce instances of shift cycling and to deliver better performance, control and cooling when towing or hauling heavy loads. Activating Tow/Haul will also engage the Grade Braking feature (See the Grade Braking & Cruise Grade Braking section for details).Exiting Tow/Haul while driving will return the transmission to its normal shifting pattern and deactivate Grade Braking. When Tow/Haul is engaged, the following functions occur:•Upshift points are raised from light-to mid-throttle and torque converter clutch is applied in 2nd range at all throttle positions to use more of the engine's available power for acceleration.•Downshift points are raised to help slow the vehicle by utilizing engine braking.•Grade braking can command downshifts to 2nd range. •The result of these various Tow/Haul functions is a more positive shift feel, especially when operating the vehicle lightly loaded.

 

Shift Stabilization -

 

By analyzing engine torque and vehicle speed before allowing an upshift, the Allison transmission minimizes unnecessary upshift/downshift cycling. If the current speed cannot be maintained in a higher gear range, this program uses the current gear and less engine torque. Shift stabilization is also utilized when the vehicle is in cruise control.

 

Cold Operation -

 

When temperatures are very cold, the transmission will prevent certain operations to protect against damage. When active the Driver Information Center will display the message “Trans in Warm-up.”The chart below shows shiftrange availability based on transmission oil temperature:•All shift ranges available (-13 degrees F and above)•2nd and 3rd shift ranges only (-31 degrees F to -13 degrees F)•2nd shift range only (-31 degrees F or lower)Torque converter clutch (TCC) operation will also be inhibited when air or transmission oil temperatures are below certain temperatures. NOTE: Shifts may be more firm with a cold transmission. This slight difference in shift quality is normal

 

.Low Traction Mode -

 

Diesel powered vehicles with the Allison Transmission are equipped with a Low Traction Mode that aids in vehicle acceleration when road conditions are slippery, such as ice or snow. By selecting 2nd range using the Range Selection system while at a stop, the Allison Transmission will limit torque to the wheels after it sees wheel slip to help prevent the tires from spinning.4 Wheel Drive Operation NOTE: When operating the vehicle in 4WD-Low there is a very deep gear ratio reduction. The resulting shifts will feel exaggerated.

 

Adaptive Shift Controls-

 

This electronic process continually compares key shift parameters to the 'ideal' shift profile stored in the transmission's computer. The adaptive shift control process makes adjustments to this factory setting in order to produce the desired shift quality depending on vehicle speed, load and road conditions.NOTE: The shift quality of a new vehicle may not be 'ideal' because the adaptive shift control process may not have determined the optimum settings for a particular shift or condition. The shift quality will improve with continued driving.

 

Heater Performance Mode -

 

In vehicles with diesel power, the Allison Transmission has a feature to shorten engine and cab warm-up times. When cold weather conditions are detected, the transmission raises part throttle up shift points [2-3, 3-4, 4-5, 5-6] to increase engine speed. NOTE: When the transmission is in this mode, upshiftsmay seem to be delayed. This is normal and does not indicate an operational problem.

biochemist Enthusiast

biochemist

Posted
Posted

Is there an echo in here? :thumbs: I posted a few days ago Allison is going to 6 speed and Duramax is going up in HP...Official? Yes, my brother works for Allisons...he is responsible for making sure the prototypes are built, schedules orders etc...I think that is official....I did not have the PDF, was just passing it along for all of you, later :eek::sigh::cheers:

whitesnake01 Enthusiast

whitesnake01

Posted
Posted

biochemist,

 

Some obvious questions:

(a) How do the gear ratios compare with the current 5sp?

(b) Have they increased the stock TQ tolerance of the tranny?

© Do we have any hints on HP/TQ for the DMAX?

biochemist Enthusiast

biochemist

Posted
Posted
biochemist,

 

Some obvious questions:

(a) How do the gear ratios compare with the current 5sp?

(b) Have they increased the stock TQ tolerance of the tranny?

© Do we have any hints on HP/TQ for the DMAX?

 

 

 

 

I asked of course about the new HP rating, he did not remember. I think he mentioned that HP/TQ is not going to be a problem...that this 6 speed is really meant to be worked hard...Our conversation stemmed from GM not renewing QS and how silly that is...we were then talking about how expensive the Allison was but then he said the tranny in the M1A1 tank is 175k per...wow :thumbs: , like 2500 $ for an allison is alot...but that is a different story. Anyway, I will ask about your questions when I speak with him this weekend and get back to you. That post above says nothing about this...no I guess not. I will let you know soon, he did say Duramax has been instructed to ramp up production for 06 though and increase capacity...guess they are popular. Later, :eek::sigh::cheers:

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

I'm glad that their adding a second overdrive gear (0.61?). But it's too late for me. There's no reason my BB w/4:10s should be turning so many rpms at highway speed when unloaded. A second overdrive gear is just what this trans. needs. Might actually gain 1 mpg or so.

 

DEWFPO

biochemist Enthusiast

biochemist

Posted
Posted
Incidentally, only big thing missing after this would be quadrasteer on HD.

 

 

 

Anyway to stop the discontinuation of this....???? Funny how very few people own this option but say it is going away and Whamo...lots of interest, maybe this is GM's ploy???hmmmm. I do not have it on my truck but I would get it on the next...hope they are just going to re-think and come back for 07.....later :thumbs::sigh::cheers:

whitesnake01 Enthusiast

whitesnake01

Posted
Posted
Anyway to stop the discontinuation of this....???? Funny how very few people own this option but say it is going away and Whamo...lots of interest, maybe this is GM's ploy???

IMHO, the issue is that GM focused the solution on the wrong part of the market: those who do not need a truck in the first place and who'd like their "stationwagon" to be a bit easier to park at Wal-Mart.

 

There are a lot of people out there using big trucks to tow their campers. If you've ever backed in a trailer in a tight spot you know what I am talking about. And for many who go down that route, this is a way of life and their pockets are much deeper. Deep enough that loaded 2500HDs are just "gotta haves". These are the people who plunk down money for Allisons, 8.1Ls, DMAXes, etc. The people that would love to have a built-in brake controller like Ford has. The people for which QS could open up camp sites they would normally not be able to get into.

 

Somehow I do not think the rumors of the QS demise are a ploy from GM... just part of the company that despite occasional bright spots (such as the Allison and DMAX) command a smaller and smaller part of the market. Would not surprise me if we see it in a Toyota 3/4 ton within 10 years though ...

biochemist Enthusiast

biochemist

Posted
Posted
Anyway to stop the discontinuation of this....???? Funny how very few people own this option but say it is going away and Whamo...lots of interest, maybe this is GM's ploy???

IMHO, the issue is that GM focused the solution on the wrong part of the market: those who do not need a truck in the first place and who'd like their "stationwagon" to be a bit easier to park at Wal-Mart.

 

There are a lot of people out there using big trucks to tow their campers. If you've ever backed in a trailer in a tight spot you know what I am talking about. And for many who go down that route, this is a way of life and their pockets are much deeper. Deep enough that loaded 2500HDs are just "gotta haves". These are the people who plunk down money for Allisons, 8.1Ls, DMAXes, etc. The people that would love to have a built-in brake controller like Ford has. The people for which QS could open up camp sites they would normally not be able to get into.

 

Somehow I do not think the rumors of the QS demise are a ploy from GM... just part of the company that despite occasional bright spots (such as the Allison and DMAX) command a smaller and smaller part of the market. Would not surprise me if we see it in a Toyota 3/4 ton within 10 years though ...

 

 

 

 

I was kidding about that anyway :thumbs: , BUT, I did hear a rumor that they may indeed bring it back in a model year or two...remarket etc... as you suggest. Hope so, they have to realize that it will sell if they market and distribute correctly...later, :eek::sigh::cheers:

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