Swap from AWD to 4X4 two speed TC

[mikez71]

Responded there, if needed you can look at my 4WD stock tune here..

Stock calibration files

Well, since the tune repository doesnt have what I have, and no way for me to upload. I will just post these here for anyone who may need. Completely stock tune files for a 2014 Camaro 2SS 6.2L LS3 manual transmission, a stock tune file for a 2014 Chevy Caprice PPV 6.0L/6L80e, stock tune file...

forum.hptuners.com

And convert my 3.08 pattern B to your 4.10 to test..
Not sure which 6.2's come with a 4LOW, maybe a shift schedule from a sierra/silverado?
Maybe a 2500 will be more likely to have 4.10's... but a 6.0..
But look at the schedule, it's just straight lines for tractor mode..

 

[SpareParts]

Yeah, i just realized it was you. Thanks for helping man!
Is the only way to copy you're pattern 1 parameter at a time?
I don't know how to change it any other way and i need to figure out how to graph all needed PIDs.

 

[mikez71]

Best thing to do first, is make sure it is going to use Pattern B when you select it.
(Otherwise you might waste time copying/creating the shift map for nothing)
So I would add the [TCM > Transmission > Shift properties > Trans shift mode] to your PID list (right click list)

To add graphs (but shift mode probably won't graph) you need to right click the graphs and select 'charts layout'
From there you can click +graph icon and you will need to select it all over again. (little tedious)
You can only graph PID's that are in the list. So usually you have to add things twice to get it to log and graph.

Anyhow, if you start the truck and log, select the 4Low and see what 'trans shift mode' says.. Hopefully it will say pattern B..

Then we can setup a map, which you can copy and paste entire maps.

 

[SpareParts]

When i shift to 4LO
4WDLo switches to, yes.
Trans Shift Mode stays, normal
If i switch tow/haul mode, Trans Shift Mode switches to Pattern A. So Pattern A is Tow/Haul mode.
Pattern B is set to, Cruise.
I wonder if changing that to Pattern 2 if that would change the Trans Shift Mode to Pattern B?

Think that is worth a try?

 

[mikez71]

When i shift to 4LO
4WDLo switches to, yes.
Trans Shift Mode stays, normal
If i switch tow/haul mode, Trans Shift Mode switches to Pattern A. So Pattern A is Tow/Haul mode.
Pattern B is set to, Cruise.
I wonder if changing that to Pattern 2 if that would change the Trans Shift Mode to Pattern B?

Think that is worth a try?

Darnit!.. Worth a shot for sure..

I would even try Pattern 3 and Trailer if Pattern 2 doesn't work.
(My Pattern B is set to trailer, but my Pattern A is set to normal)

I suspect that the "Pattern type" is different than the pattern maps, and just a label thing..
(I haven't heard anyone notice a change.. if you do, you'd probably be the first!)

If it doesn't work, I wonder if you need a different transmission OS, or the ECM just isn't sending the signal, even though it acknowledges the switch..

 

[SpareParts]

I still have pattern 3, 4 and performance to try.
Do i need to write entire for the ECU and TCU or just write entire for the TCU?

 

[SpareParts]

Darnit!.. Worth a shot for sure..

I would even try Pattern 3 and Trailer if Pattern 2 doesn't work.
(My Pattern B is set to trailer, but my Pattern A is set to normal)

I suspect that the "Pattern type" is different than the pattern maps, and just a label thing..
(I haven't heard anyone notice a change.. if you do, you'd probably be the first!)

If it doesn't work, I wonder if you need a different transmission OS, or the ECM just isn't sending the signal, even though it acknowledges the switch..

It is foreign territory for sure.
I could not find a single post where anyone has tried this.
I have seen a few posts where they say it shifts ok and i spose it does but i drove the wife's 13 Avalanche and in 4Lo it is WAY different shifting. Much smoother and not as harsh.
If i can get the TCM to cooperate I do know how to make the dash light work in 4X4 mode.

 

[mikez71]

I still have pattern 3, 4 and performance to try.
Do i need to write entire for the ECU and TCU or just write entire for the TCU?

Just write the TCM.

 

[SpareParts]

I can not get the transmission mode to change no matter what pattern i try so unless im doing something wrong it won't work the way im trying.
I'll try again in a few days.

 

[mikez71]

I can not get the transmission mode to change no matter what pattern i try so unless im doing something wrong it won't work the way im trying.
I'll try again in a few days.

Unfortunately it will probably require at minimum a 4wd tcm OS..
There's still a lot of factory tuning not mapped by hptuners, and since your pattern B is cruise...

BUT, even with a 4wd OS, there's no guarantee that you don't need the speed sensor setup,
or that it's not the xfer case encoder that's responsible for sending the correct signal to the TransferCaseControlModule (so it knows you actually are in low gear) before it sends the correct signal to the TCM...(which the more I think about it, would not surprise me at all.)

Any chance you can do without tow mode?
Then you could hit the tow button anytime you activate 4LO..

TUTD seems like it would be suited to climbing and stump pulling though...
Manual transfercase, manual shifting!
But actually it looks like you can setup TUTD to shift automatically...
Shift 4LO, pull the shifter over to 'manual' mode?

 

[SpareParts]

The main reason i want to use a different mode is because when the TC is in 4Lo the shifts are kinda harsh.
There has to be something that tells the trans to switch to 4WDLo mode. The ECU switches to 4WD active but where that leads to after that i have no idea and probably never going to figure that out.
I could do without tow mode. Heaviest thing i tow is 3500 lbs.
TUTD would also work

I guess what im looking for is to have it shift smoother then it is shifting with the TC in 4Lo. As it is now when in 4Lo it is shifting like a race car that has a built TH400.

 

[mikez71]

While there could be other settings we can't see for 4LOW, my hunch is, the shift might be rough because of the schedule.

Top is your schedule, below is a 2012 6.2 sierra 4WD, that I did the gear wizard to change from 3.42 to 4.10..
If you look at the upshift cells at 37% and up, yours is shifting at QUITE a bit higher speed..

Now if you drive at 31% and below, and tell me it shifts too hard, then I dunno.
Also don't know how this would help your downshift coming to a stop..
Maybe something to do with yours being a 3-1 downshift? Not sure..

As a quick test, you could copy this to your pattern A tow mode and test it out..

 

[SpareParts]

I think im going to try write entire to the ECM and TCM. Gonna take all fricken day but i want to be sure i have tried everything i can with the tune before i switch to changing either Tow/Haul mode or TUTD.

 

[SpareParts]

@mikez71
Question for ya.
2009 GMC Sierra 1500 was the first year gm used the 6.2L, 6l80E in a 4wd setup.
Do you think swapping the TCM OS is possible?
I have no idea how to do it but i know i could if it is worth the effort.

 

[mikez71]

Unfortunately, these two links makes it sound like you need to match the year exactly..
You might contact that rpmextreme shop, it sounds like he spends time setting up shift schedules with 4LOW.

Gen IV Software Compatibility ECM/TCM

A little background. I installed a L92/6L80 into a 1965 Buick Skylark. I have been getting a U0100 code and have traced it down to the difference in the E38 ECM and TCM years. With my scanner I was able to pull the VIN# off the E38 and found out it came out of a 2007 Escalade 4-door sport...

www.yellowbullet.com

RPM Extreme - Jeep LS & LT Swap Specialists

Home of the Ezcanbus Module.

www.rpmextreme.com

Might check with a couple guys in this thread, if you haven't already..

Denali AWD to 2 speed 4wd Transfer Case Swap.

Thought I would post a bit about my AWD to 4WD conversion on my 2007 GMC Yukon XL Denali. I like the AWD for snow driving, traction, etc., but wanted selectable 4 LO and being able to have 2WD for a little more daily, highway efficiency and donuts One other major downside of the AWD tcase is...

www.tahoeyukonforum.com

 

[SpareParts]

Always something!
Looks like the easiest thing to do is reprogram Tow/Haul mode into a Pattern B copy.
Would that give the desired results?

 

[mikez71]

Always something!
Looks like the easiest thing to do is reprogram Tow/Haul mode into a Pattern B copy.
Would that give the desired results?

Yep, if you copy the pattern B from a 4WD tune.
Just check to make sure the 100% throttle position shift speeds are about half of your normal.
All the 4LO maps I have seen so far, look like the one I posted above, straight lines..

 

[SpareParts]

The mechanical part is so easy! The tune part is sooooooo hard.
The earliest the 6.2L, 6l80E, 4X4 combo was used is 2009 in 1500 Silverado and Sierra's
When i look at one of them files the columns don't match up. They have 1 column and mine has 2 columns.
How do you get around that?
Gotta say i really appreciate you taking the time on this.

 

[mikez71]

Don't thank me yet! Let's see if it helps..
Let me take a look at some files here..

All the '09 silverados I see are a 6.0..
Why don't I copy the file I took a pic of in post #32?
Tire size is close enough.. 2475mm circumference to 2490.. I'm not going to mess with that, keep it simple.

Remove the ".txt" from the file and see if you can load it.

I changed your Pattern A to be like the Pattern B in a 2012 Sierra 4WD converted to 4.10 (from 3.42)
TCC disabled, WOT shift RPM lowered to 3000 rpm as it normally is for Pattern B. (Same with my Tahoe)

I see the two columns you are talking about, it's only in your tune, not the later tunes.
I can only guess that GM planned to use two settings, but since both columns are the same for "0" and "100", they probably decided not to.
HPTuners just found the data and made it available is my assumption...

Same with the 4LOW schedule, maybe some leftover code that's not used.. the speeds don't really make sense.
Later tunes shifting out of first at just 3mph, and all the speeds in your original 4LOW map seem too high..

I've never logged my 4LOW speeds.. Hope it works..

 

[SpareParts]

Here is a 2009 Sierra 6.2, 6l80e i got from the repository.