4l80 swap for custom operating system

[uaesands]

I'm doing a 4l80 swap to my 2005 1500 Sierra , can I do a custom operation system after doing the segment swap for my stock tune.
My setup is as follow :
418 ls1
Custom intake
Twinturbo
3bar map sensor
#80 injectors
Cusome fuel system with surge tank

I'm planing to run 2 bar of boost.



Thanks in advance

Thanks in advance

[ScarabEpic22]

I imagine the 2500 trucks had a 80E behind them, should be able to find a stock file with an 80E and either do a seg swap or leave it alone then do a COS upgrade.

[Chevy366]

Yeah, custom os is just a base for your original os that adds some additional parameters .
So build a .tun with seg swap then follow the custom os tutorial and your good to go.

[joecar]

+1 do the segment swap first.

[L31Sleeper]

These guys are right do the segment swap first then do the COS.
Don't loose any sleep over it, just take your time and do it right.
I've got a L31 350, 4L80E, 12200411 PCM with COS5.

[uaesands]

thanks all, I'll update you guyz with the progress, with some build pictures

[joecar]

Ok thanks, we like pictures :cheers:

[Supercharged111]

Back from the dead! Just to clarify now, once I swap those 2 wires and do this segment swap, the 4L80E should work without any issues, right?

[L31Sleeper]

I pulled two wires out of the trans harness (that the 80 doesn't use) and used them for the additional
speed sensor (that the 60 doesn't use) Basically both transmissions have the same number of wires total.
The 60 has one more solenoid than the 80 and the 80 has one more sensor than the 60.
So you have to swap those wires at the PCM and at the trans.

[joecar]

The wiring differences between 4L60/65/70E and 4L80/85E can be summarized as follows:

4L60/65/70E have two additional solenoids: 3-2 solenoid and TCC Clutch/Enable solenoid (wired via transmission internal harness).

4L80/85E have an additional speed sensor: ISS (wired via external harness).

Some 4L65/70E also have the ISS (wired via external harness).

The TCC PWM signal changes pins (wired via transmission internal harness).


PNP switch: some PCM's use 1-wire PNP while others use 4-wire PNP (all cases wired externally).

[Supercharged111]

This auxilliary speed sensor can be simply omitted, correct? Seeing how my 4L60 truck never came with one, I don't anticipate the PCM would be looking for it would it?

[Taz]

The ISS is used by the PCM to run the “Slip Test” diagnostic. If you swapped in a 4L80 segment – the PCM will be “looking” for input from this sensor. You can set the DTCs to “Not Reported” for the ISS and the Slip Test diagnostic - to run without an ISS.

Personally, I would run the ISS and Slip Test diagnostic - it’s a good early warning system when the transmission components are being pushed to the limit (or beyond) - especially when using a power adder.


Regards,
Taz

[Supercharged111]

I'll take a peek at a 4L80 segment to familiarize myself with this, I visualized swapping a segment as copy/pasting the entire transmission "folder" from 1 tune to another, not taking into account the possibility of the "folder" having more sub-folders. That must be where the ISS stuff is. The whole reason for the 4L80 is because I have a Whipple (not yet installed though) and I tow, so the ISS sounds like a pretty good idea now.

[Taz]

What OEM OS are you using ? You copied over the segments for both the Transmission Calibration and Transmission Diagnostics, correct ?


Regards,
Taz

[Supercharged111]

Nope, planning ahead. Will be using a 411 with COS5 (just need plugs and repinning tools) and Express Van base tune. Gonna be a busy summer! I want to swap before the 60 acts up so I can still get some $$$ off of it. I know I need to swap input shafts in the T-case, might need to resize driveshaft, sub'd to this thread so I don't forget how to do the incredibly simple wiring, and of course the segment swap. I don't want any surprises on the day of.

[Taz]

OK … now I understand what you’re doing ….

My comment in post #12 above regarding setting the DTCs to “Not Reported” apply to more recent 4L60 / 4L80 OS.

If you’re going to use a 2001-2002 OS (as the basis for the COS5 upgrade) the ISS DTCs are P0716 and P0717 - these may be set to “Yes / No” values.

The Slip Test parameters are found in E0801 to E0804. These parameters allow you to adjust the TPS and Transmission Temperature values of the Slip Test. By adjusting these values the Slip Test could be disabled, or modified to suit your preferences.


Regards,
Taz

[Supercharged111]

Excellent info, thank you much sir.