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2023 L8T 10 Speed

C/K Man

By C/K Man
in 6.6L Gas V8 (L8T)

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Another JR Senior Enthusiast

Another JR

Posted
Posted
1 hour ago, MTU Alum said:

3.73 is standard on L8T

I meant was the 10 speed an option and you can also order the 6L90, or is the 10 speed the only transmission offered?  Thanks. 

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Epsilon Plus
Epsilon Plus

I wouldn't be surprised to see it in LTZ or higher trims, or maybe even a stand alone option for LT, perhaps included with LT. Reason being is the 6L90E is the bulletproof fleet trans on the market. I

SWDoodle
SWDoodle

I would be fine with 4.10/4.30’s with the 6-speed.  I just don’t understand why GM won’t give some options for Max payload with the gas.  I would agree the 10 speed may shift a ton if towing.  You’d a

Epsilon Plus
Epsilon Plus

Read between all the lines of this thread and you'll find if you're the average home owner/truck guy not needing to tow more than 10,000lbs with a travel trailer or dump trailer/equipment trailer then

Pryme Senior Enthusiast

Pryme

Posted
Posted
11 hours ago, Another JR said:

I meant was the 10 speed an option and you can also order the 6L90, or is the 10 speed the only transmission offered?  Thanks. 

Only the 10spd I’ve heard. 6spd will not be offered. 
 

I’ve read 10spd trucks hunt around for gears more, I’m fine with my 6spd. 

SWDoodle Enthusiast

SWDoodle

Posted
Posted
On 9/26/2022 at 5:22 PM, Another JR said:

As an option or are they only offered in 10 speed?

 

 Looks like there is only one gear option, the 3.73.  I'm ok with that.  I figured they would do something stupid and offer a 3.23/3.42.  I think a 4.10 with the 10 speed is probably not needed.  I think Ford offers a 4.3 with the 7.3 though.  I was really hoping for a bump in power for the L8T.  I guess at least we got a transmission.  One thing after reading and listening to a few videos it sounds like GM has made some changes to the low end torque.  Claiming it increased low end torque by 25%.  One site I watched said it was the diesel, another said it was the diesel and gas motors.  If the low end torque for the gas increases 25% that's a game changer for the guys like me how don't tow often, but when I do it's heavy.  I about pulled the trigger on a 2023 but I'm just gonna wait.  Enough has changed with the interiors and powertrain that it's gonna be worth it now IMO.  

MTU Alum Enthusiast

MTU Alum

Posted
Posted
7 hours ago, SWDoodle said:

 

 Looks like there is only one gear option, the 3.73.  I'm ok with that.  I figured they would do something stupid and offer a 3.23/3.42.  I think a 4.10 with the 10 speed is probably not needed.  I think Ford offers a 4.3 with the 7.3 though.  I was really hoping for a bump in power for the L8T.  I guess at least we got a transmission.  One thing after reading and listening to a few videos it sounds like GM has made some changes to the low end torque.  Claiming it increased low end torque by 25%.  One site I watched said it was the diesel, another said it was the diesel and gas motors.  If the low end torque for the gas increases 25% that's a game changer for the guys like me how don't tow often, but when I do it's heavy.  I about pulled the trigger on a 2023 but I'm just gonna wait.  Enough has changed with the interiors and powertrain that it's gonna be worth it now IMO.  

Torque change is diesel only.

 

#iworkforGM

the wanderer Enthusiast

the wanderer

Posted
Posted
On 9/27/2022 at 8:24 AM, Pryme said:

Only the 10spd I’ve heard. 6spd will not be offered. 
 

I’ve read 10spd trucks hunt around for gears more, I’m fine with my 6spd. 

 

Don't know where you've heard that. This forum certainly loves the 10 speed.

 

There is also a difference between "using" 10 gears and "hunting". Just because you hear it using a bunch of gears, doesn't mean it's hunting. The question is, is it always in the right gear at the right time? With Ford, I've heard the answer is "no". But with GM's tuning I've never heard reports about hunting.

 

Remember it has 10 gears. The point of them is to use them. That means it picks the best gear going up a hill to keep you in your power band without over revving/screaming, and it means it can brake assist going down without revving too high and slowing you down too much, or revving too low and not providing any brake assist.

 

It also means when you're towing for 2 hours straight, your RPMs are right where they need to be to minimize revving and wear, and maximize mpg.

 

There is literally no downside to a 10 speed if the tuning is right.

 

For myself, I can finally put the 6.6 gasser on my list for next truck. There is 0 chance I'm getting the 6 speed as TFL has demonstrated that the tuning is very poor.

  • Like 1
Pryme Senior Enthusiast

Pryme

Posted
Posted
12 hours ago, the wanderer said:

 

Don't know where you've heard that. This forum certainly loves the 10 speed.

 

There is also a difference between "using" 10 gears and "hunting". Just because you hear it using a bunch of gears, doesn't mean it's hunting. The question is, is it always in the right gear at the right time? With Ford, I've heard the answer is "no". But with GM's tuning I've never heard reports about hunting.

 

Remember it has 10 gears. The point of them is to use them. That means it picks the best gear going up a hill to keep you in your power band without over revving/screaming, and it means it can brake assist going down without revving too high and slowing you down too much, or revving too low and not providing any brake assist.

 

It also means when you're towing for 2 hours straight, your RPMs are right where they need to be to minimize revving and wear, and maximize mpg.

 

There is literally no downside to a 10 speed if the tuning is right.

 

For myself, I can finally put the 6.6 gasser on my list for next truck. There is 0 chance I'm getting the 6 speed as TFL has demonstrated that the tuning is very poor.

TFL is for entertainment purposes only. Those guys are morons. 

  • Like 2
Another JR Senior Enthusiast

Another JR

Posted
Posted
13 hours ago, the wanderer said:

 

There is 0 chance I'm getting the 6 speed as TFL has demonstrated that the tuning is very poor.


If you are referring to the “Ike Gauntlet” video, there was an engine thermal management feature (I’m guessing a nitrous oxides emissions related limit on exhaust gas temperature) that prevented downshifting late in the climb. 

 

CRApex Enthusiast

CRApex

Posted
Posted (edited)
23 hours ago, the wanderer said:

 

Don't know where you've heard that. This forum certainly loves the 10 speed.

 

There is also a difference between "using" 10 gears and "hunting". Just because you hear it using a bunch of gears, doesn't mean it's hunting. The question is, is it always in the right gear at the right time? With Ford, I've heard the answer is "no". But with GM's tuning I've never heard reports about hunting.

 

Remember it has 10 gears. The point of them is to use them. That means it picks the best gear going up a hill to keep you in your power band without over revving/screaming, and it means it can brake assist going down without revving too high and slowing you down too much, or revving too low and not providing any brake assist.

 

It also means when you're towing for 2 hours straight, your RPMs are right where they need to be to minimize revving and wear, and maximize mpg.

 

There is literally no downside to a 10 speed if the tuning is right.

 

For myself, I can finally put the 6.6 gasser on my list for next truck. There is 0 chance I'm getting the 6 speed as TFL has demonstrated that the tuning is very poor.

Agree, the 10spd will be great and has been great paired to the Duramax.  When I read the "I wanna stick with the 6spd" comments I can only imagine how they will look back and think how premature their comments were.  The 10spd being paired with the l8t has proven itself paired to the Duramax and will make everyone forget about the 6spd really quick.  I have always purchased diesels but the addition of the Allison branded 10spd paired with the gas motor might get me thinking about trying the gas next time around.

Edited by CRApex
the wanderer Enthusiast

the wanderer

Posted
Posted
On 10/1/2022 at 12:13 AM, Another JR said:


If you are referring to the “Ike Gauntlet” video, there was an engine thermal management feature (I’m guessing a nitrous oxides emissions related limit on exhaust gas temperature) that prevented downshifting late in the climb. 

 

 

Do you have details on that or just guessing? I'm kind of curious, because I've seen more than one report that the 6.6/6 speed has trouble climbing long and heavy grades so I don't think it was a "one off" issue.

the wanderer Enthusiast

the wanderer

Posted
Posted
On 9/30/2022 at 10:59 PM, Pryme said:

TFL is for entertainment purposes only. Those guys are morons. 

 

Yes they are, but they demonstrated the problems with the 6.6 very nicely. Whatever it was, they had the pedal planted to the floor and the truck could only do 2400 RPMs by the time it hit the top. I always understood it was a transmission tuning, not downshifting when it should be.

 

In any case, more gears would help prevent that.

Another JR Senior Enthusiast

Another JR

Posted
Posted (edited)
38 minutes ago, the wanderer said:

 

Do you have details on that or just guessing? I'm kind of curious, because I've seen more than one report that the 6.6/6 speed has trouble climbing long and heavy grades so I don't think it was a "one off" issue.

This was discussed in another thread to some extent. A person with apparent insider knowledge said it was an engine cooling related issue (not water cooling) and hinted it was emissions related, but they were apparently not at liberty to give details. My speculation that it is NO/NO2 related is just common sense based on emissions knowledge I have from my work. It is just speculation, though. 

Edited by Another JR
Kjduvall Enthusiast

Kjduvall

Posted
Posted (edited)

I'm just curious what the difference in parastatic loss are between the two trannys and if the added gear ratios will definitevly make up for it. As in heavy flywheel/heavy converter and more power loss to turn it, in relation to out put. I'm sure the 10spd is sweat. If it takes 40 more HP to turn it and a less snappy Rev range. will the (leverage of gears) be enough to over come that loss. Just some thinking I've been doing. Any thoughts???

Edited by Kjduvall

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