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Second 6l80 trans died today

2015 High Miler
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Z45
Z45

I thought Dexon VI was the ATF to end all ATF's, no transmission should ever fail because GM says DEXRON-VI is far superior.

2015 High Miler
2015 High Miler

McCoys in Garland. $4200 out the door and replaced the rear main that was leaking as well.  I never noticed it but was told by a couple of techs that it was leaking.  Took 4 days.  Very satisfied at t

2015 High Miler
2015 High Miler

For the tune that’s on the truck now, it was no different. Crispier but not really harder.   Tune was already pretty good on the shifts.  He warned me that it would be considerably firmer but it’s goo

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CamGTP Senior Enthusiast

CamGTP

Posted
Posted

This is a tune I made for someone last year. Use the compare feature to see some of the transmission related changes. Your truck has different size tires on it than this I believe so do not do anything with the shift schedule stuff or speed related items because they will always be different.

 

The main stuff is the Shift pressure, shift timing, torque converter and torque mngt.

 

I have minor changes in the shift pressure and changes in the adaptive settings. My shift timing setup is different than yours. I also turn off the torque converter for gears 1-4 and only use lock up in 5th/6th gears. As well as turning off the TCC slip for converter life. The apply/release section, only use the "NORMAL" section, that will turn off the TC in gears 1-4 and raise the MPH settings for lockup in 5th and 6th. In the TM tab I would put the shift torque factor back to stock or put it at like .9500, you really don't need to adjust that table by half like that.

 

This is my opinion here but the commanded AFR under WOT is kinda lean if you are running 87 octane. I'd keep that around 12.4-12.5 instead of 12.8. If running 91+ octane it's probably alright.

 

I run leaner if I have higher ethanol content in the fuel but I have my tables setup to use the sensor that way. Also your timing tables are higher than stock which can be okay but I don't know how it's performing. It may be too much timing for 87 octane, on my truck I'm only around 20 degrees but move towards 25-27 with E60 fuel. Also your tuner didn't give you enough wiggle room between the high and low octane table. It's only giving you 1-2 degree difference, the low octane table should be atleast 5-6 degrees less. I'd just highlight the whole low octane table and remove another 4 degrees from it.

 

You will have to reset the transmission adapts after flashing those changes and before starting the truck again. Just a simple step.

 

 

 

 

 

2015 Silverado. test.hpt

pokismoki Senior Enthusiast

pokismoki

Posted
Posted
3 hours ago, 2015 High Miler said:

small update.  New trans is doing well.  I did get an updated tune to reflect the new components and its still working well.  The temps are where I would expect with the cooler and the bypass.  Highest I've seen is 140 in heavy city traffic.  

 

I do need to get a better tune though, both engine and trans.  I have HP Tuners but I'm not very good at it yet.  

 

If anyone is in the DFW area that has some experience, Id be happy to meet up and get a look at my tune.  

what updates did you install physically into the rebuild?

pokismoki Senior Enthusiast

pokismoki

Posted
Posted
5 minutes ago, CamGTP said:

This is a tune I made for someone last year. Use the compare feature to see some of the transmission related changes. Your truck has different size tires on it than this I believe so do not do anything with the shift schedule stuff or speed related items because they will always be different.

 

The main stuff is the Shift pressure, shift timing, torque converter and torque mngt.

 

I have minor changes in the shift pressure and changes in the adaptive settings. My shift timing setup is different than yours. I also turn off the torque converter for gears 1-4 and only use lock up in 5th/6th gears. As well as turning off the TCC slip for converter life. The apply/release section, only use the "NORMAL" section, that will turn off the TC in gears 1-4 and raise the MPH settings for lockup in 5th and 6th. In the TM tab I would put the shift torque factor back to stock or put it at like .9500, you really don't need to adjust that table by half like that.

 

 

 

did you install a larger regulator in the pump before increasing the line pressures or max peak pressures first?

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

I don't touch the max pressure settings. I only increased the 1-2 and 2-3 shift upshift pressures slightly.

  • Like 1
2015 High Miler Enthusiast

2015 High Miler

Posted
  • Author
Posted (edited)
1 hour ago, pokismoki said:

what updates did you install physically into the rebuild?

This is posted earlier in the thread:
 

Builder said it’s built to handle 700 HP.  More if it had a hardened input shaft.  

DCE70F46-4978-4CAA-B637-E532B965EBA3.jpeg

Edited by 2015 High Miler
  • Like 1
2015 High Miler Enthusiast

2015 High Miler

Posted
  • Author
Posted
1 hour ago, CamGTP said:

This is a tune I made for someone last year. Use the compare feature to see some of the transmission related changes. Your truck has different size tires on it than this I believe so do not do anything with the shift schedule stuff or speed related items because they will always be different.

 

The main stuff is the Shift pressure, shift timing, torque converter and torque mngt.

 

I have minor changes in the shift pressure and changes in the adaptive settings. My shift timing setup is different than yours. I also turn off the torque converter for gears 1-4 and only use lock up in 5th/6th gears. As well as turning off the TCC slip for converter life. The apply/release section, only use the "NORMAL" section, that will turn off the TC in gears 1-4 and raise the MPH settings for lockup in 5th and 6th. In the TM tab I would put the shift torque factor back to stock or put it at like .9500, you really don't need to adjust that table by half like that.

 

This is my opinion here but the commanded AFR under WOT is kinda lean if you are running 87 octane. I'd keep that around 12.4-12.5 instead of 12.8. If running 91+ octane it's probably alright.

 

I run leaner if I have higher ethanol content in the fuel but I have my tables setup to use the sensor that way. Also your timing tables are higher than stock which can be okay but I don't know how it's performing. It may be too much timing for 87 octane, on my truck I'm only around 20 degrees but move towards 25-27 with E60 fuel. Also your tuner didn't give you enough wiggle room between the high and low octane table. It's only giving you 1-2 degree difference, the low octane table should be atleast 5-6 degrees less. I'd just highlight the whole low octane table and remove another 4 degrees from it.

 

You will have to reset the transmission adapts after flashing those changes and before starting the truck again. Just a simple step.

 

 

 

 

 

2015 Silverado. test.hpt 2.4 MB · 3 downloads

Cam, thanks for this info but TBH, I have not become very proficient yet with HPT and looking at these tunes.  I've had some trouble getting my compare files to open.  Most likely user error.  Ill try again with this one.  

 

I def would like to be able to switch fuels.  I could at one point but now its really down on power with 87 and with 91/93 its about where it used to be with 87.  I drive a lot of highway miles back and forth to work and with fuel prices where  they are, being able to run 87 for the long hauls would be great.  With that, I am willing to run it on 91 if it makes the type of power that I think it should. it just feels really weak off the line and at one point when first tuned, it would really get it off the line.  I recently pulled a two wheel trailer to DFW and back and it was horrible on power and mileage and was always in 5th gear it seems.  That was with an empty load.  

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