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Silverado 6L80E Transmission Thermostat Delete

rav3
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rav3 Senior Enthusiast

rav3

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2 hours ago, Ltz4 me? said:

How can I tell if I have this transmission?

Will it stop erratic shifting if I've already deleted afm with a mpg tune?

Thanks fellas

Look at your RPO code sticker in the glove compartment. MYC - TRANSMISSION, 6 SPD AUTOMATIC

If you have an 8 speed, its a different transmission than this post.

What year, model, engine size & miles would be a good start, so that others know what your driving.

Not sure about you 2nd question. 6 speed has it's issues & 8 speed it's issues. So, let's determine which transmission you have 1st

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newdude
newdude

Some more food for thought.   6L80/90.  The Transmission Control Module (TCM) is internal to the transmission.  If you drop the pan, its an integral part of that solenoid control body that i

Grumpy Bear
Grumpy Bear

Fluid leaves the transmission via the thermostats top line and is routed to the drivers side radiator tank (hot side on your model) then from there to the AC condensers top half and back to the thermo

rav3
rav3

1st off, let me thank newdude for jumping in here with his great info. I'm glad to see input from someone that sees this stuff first hand & is willing to step up & report what he see's. Your i

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rav3 Senior Enthusiast

rav3

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8 minutes ago, Ltz4 me? said:

I have an 8

Do a search for the 8 speed shifting issues

flyingfool Senior Enthusiast

flyingfool

Posted
Posted
4 hours ago, Ltz4 me? said:

How can I tell if I have this transmission?

Will it stop erratic shifting if I've already deleted afm with a mpg tune?

Thanks fellas

i think all 1500 trucks after 2014 have trans stat...

if it shifts wierd have the dealer do a "trans re-learn proceedure" and a flush..

Ltz4 me? Enthusiast

Ltz4 me?

Posted
Posted

I don't think dealer will do a transmission relearn b/c I've run a delete AFM and tuned it to a mpg save option.

Even if I set truck back to stock tune with AFM on then they do a transmission relearn, I think when I get truck back I will return it to aftermarket tune b/c the sound of 4 cylinder kicking in and out constantly and shifting constantly drives me crazy( hence the AFM delete and tune I've installed(i already had all fluid flushed, new filter and 12quarts of new improved synthetic fluid done b/c the wiring harness was throwing a po711 code...

So in my head it would just confuse the system to set back to stock, dealership does this relearn, I get it back reset it to delete AFM/tune what did I just gain?( Other than really confusing my truck with its adaptive learning system)

I'm tempted to just wait for Atleast 1000 miles or so and see if the adaptive learn straightens itself out and if it doesn't, change it from a mpg save to a performance tune and hopefully that will keep a more aggressive shift pattern?

 

flyingfool Senior Enthusiast

flyingfool

Posted
Posted
14 hours ago, Ltz4 me? said:

I don't think dealer will do a transmission relearn b/c I've run a delete AFM and tuned it to a mpg save option.

Even if I set truck back to stock tune with AFM on then they do a transmission relearn, I think when I get truck back I will return it to aftermarket tune b/c the sound of 4 cylinder kicking in and out constantly and shifting constantly drives me crazy( hence the AFM delete and tune I've installed(i already had all fluid flushed, new filter and 12quarts of new improved synthetic fluid done b/c the wiring harness was throwing a po711 code...

So in my head it would just confuse the system to set back to stock, dealership does this relearn, I get it back reset it to delete AFM/tune what did I just gain?( Other than really confusing my truck with its adaptive learning system)

I'm tempted to just wait for Atleast 1000 miles or so and see if the adaptive learn straightens itself out and if it doesn't, change it from a mpg save to a performance tune and hopefully that will keep a more aggressive shift pattern?

 

you can disable AFM by driving in 5th gear or lower, using 6th gear activates it.

SeekAndDestroy Enthusiast

SeekAndDestroy

Posted
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23 hours ago, Ltz4 me? said:

Will it stop erratic shifting if I've already deleted afm with a mpg tune?

 

I did this mod on my 8 speed. It will not do anything for your erratic shifting problem. This lets the transmission fluid recirculate through the trans cooler all of the time, which keeps the trans fluid temperature down. 

 

If it's shifting weird drive in tow/haul mode, this makes it slightly more aggressive. Or get it tuned, which is about $1000 CAD

Ltz4 me? Enthusiast

Ltz4 me?

Posted
Posted

Well that's what I'm getting at, it shifts normal when cool in the morning ( every time)

Then on way home after sitting on hot blacktop parking lot it shifts totally different and gets more noticeable as I'm watching the temperature in the transmission rise on my dash screen...

newdude Senior Enthusiast

newdude

Posted
Posted
14 hours ago, Ltz4 me? said:

I don't think dealer will do a transmission relearn b/c I've run a delete AFM and tuned it to a mpg save option.

Even if I set truck back to stock tune with AFM on then they do a transmission relearn, I think when I get truck back I will return it to aftermarket tune b/c the sound of 4 cylinder kicking in and out constantly and shifting constantly drives me crazy( hence the AFM delete and tune I've installed(i already had all fluid flushed, new filter and 12quarts of new improved synthetic fluid done b/c the wiring harness was throwing a po711 code...

So in my head it would just confuse the system to set back to stock, dealership does this relearn, I get it back reset it to delete AFM/tune what did I just gain?( Other than really confusing my truck with its adaptive learning system)

I'm tempted to just wait for Atleast 1000 miles or so and see if the adaptive learn straightens itself out and if it doesn't, change it from a mpg save to a performance tune and hopefully that will keep a more aggressive shift pattern?

 

 

 

Not to stray from the cooler mod here, but you need to ditch the "tuner" you are using and get a custom tune.  

rav3 Senior Enthusiast

rav3

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3 minutes ago, Ltz4 me? said:

Well that's what I'm getting at, it shifts normal when cool in the morning ( every time)

Then on way home after sitting on hot blacktop parking lot it shifts totally different and gets more noticeable as I'm watching the temperature in the transmission rise on my dash screen...

LTZ4.......IMO, you need to have your dealer replace the fluid in your 8 speed to the newer Mobil 1 Synthetic LV ATF HP transmission fluid. There's a TSB on this out there,

Check this link...https://gm-techlink.com/?p=11127

SeekAndDestroy Enthusiast

SeekAndDestroy

Posted
Posted
10 minutes ago, Ltz4 me? said:

Already did, but only 350 miles ago so I think it's still in relearning pattern hopefully

These trannys are always “learning” trying to maximize mpg, etc. After 350 miles it should be done the initial learn and smooth out. 10-20 hot/cold cycles is usually all it takes. 
 

There is no downside to deleting the thermostat. I was seeing as hot as 80*C before I flipped the pill. Now it won’t go above 50. No change in mpg, but also no change in shifting either. Get it tuned

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
9 minutes ago, Ltz4 me? said:

Ok, any video of doing this?

Several and two methods that both work. Flip the pill or plug the transfer port. Youtube.

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