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Silverado 6L80E Transmission Thermostat Delete

rav3
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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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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

Silverado 6L80E Transmission Thermostat Delete

 

I missed where we traded horses and are now doing an 8 speed. Listen to Cameron. 

SeekAndDestroy Enthusiast

SeekAndDestroy

Posted
Posted
2 hours ago, Ltz4 me? said:

Hmmm, where is it then?

I have the 8 speed. To do this mod I used the 6 speed YouTube videos for reference. The thermostat housing looks identical to the 6 speed, and its in the same spot on the tranny. Pretty sure it’s the same part. 

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Ltz4 me? Enthusiast

Ltz4 me?

Posted
Posted

What's the temperature difference between factory and deleted that you've noticed?( did you just flip tstat over reinstall the spring then put cap back on with snap ring?)

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted (edited)
2 hours ago, SeekAndDestroy said:

I have the 8 speed. To do this mod I used the 6 speed YouTube videos for reference. The thermostat housing looks identical to the 6 speed, and its in the same spot on the tranny. Pretty sure it’s the same part. 

Thank you for the conformation. That is helpful.  Very helpful. 

 

 

 

 

Edited by Grumpy Bear
flyingfool Senior Enthusiast

flyingfool

Posted
Posted (edited)

another tip if your trans "6 or 8 speed" units, is to have the tuner only activate TCC  system on the final two gears of the transmission . this will lengthen the service life of the torque converter and improve shifts.

 

on my 6 speed , driving in M4 has much improved shift points  with the oem tune when compared to using M5 or Drive.  there is also less kick down when going WOT, something worth looking at in the histograms of the tcm. and copyng  over to the 5th thru 6th gears

for more performance tuners dont exceed 25-30% reduction on the Torque managment. i've read they pull about -5 degrees timing between shifts.  more stuff to learn

 

Edited by flyingfool
Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
On 9/4/2020 at 8:15 PM, Ltz4 me? said:

What's the temperature difference between factory and deleted that you've noticed?( did you just flip tstat over reinstall the spring then put cap back on with snap ring?)

Now that we have conformation.... Depends on the ambient temperature.

I collected this data over several years using two different water thermostats

170 F & 180 F

 

If your still using the 207 F water thermostat your numbers will be higher.

 

TransTemp.thumb.png.026abb0e57c15a77d3ae332bdbbbfe88.png

Bottom scale is air temperature

Left scale is ATF temperature

Reference is 55 mph

Ltz4 me? Enthusiast

Ltz4 me?

Posted
Posted

Awesome, what will the atf# be with the factory water t stat in place?

I don't understand what the water stat has to do with the tranny temp?2016 Silverado 5.3 8speed have a transmission temperature sensor, do all modern ones have them?

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
3 hours ago, Ltz4 me? said:

Awesome, what will the atf# be with the factory water t stat in place?

 

I guess most see about a thirty plus degree drop. 

Ltz4 me? Enthusiast

Ltz4 me?

Posted
Posted

Ok, so how much did you drop extra b/c of the 175deg water stat change in addition to the pill flip?

I wonder with the new synthetic fluid upgrade as the latest TSB if 180-200 is less of a problem in some way due to if let's say this fluid can withstand a higher temp than the standard transmission fluid?

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