Factory tune shift oddity

[Mudsport96]

Hey all, i am new to tuning, and thought id ask for some input. Quick background on the truck.

I have a 2006 ex cab z71 with the L33 and 60e. Its on its 3rd transmission, BUT but it does have 400k miles on the truck. Father in law has owned it since 17,000 miles and gave it to me to fix for my daughter when the trans started flaking out again. No big deal to me since that meant she would have something to drive other than my Nova.

Ok to the issue. The truck has ALWAYS had a goofy 1-2 shift. Anything less than 25 percent throttle its just a slow sliding shift, worse than my 06 tahoe. Then 25 to id say 50 percent throttle its a slide with a quick slam into second. And finally above 75 percent its a flare slam into 2nd gear.

But 2-3 and 3-4 have and are always fine. Tps works and reads fine, coolant temp sensor fine. So no external sensors should be causing this, and since all 3 transmissions over 400k miles have acted the same i can only figure it is the shift tune. If i upload the factory tune can someone dissect it or give it a look? I only have tunerpro and there isnt currently an xdf to look at the 7811 operating system.

[In-Tech]

Try this and post back. You should only to a calibration write and not a full clone since this was done on my bench test puter.

[Mudsport96]

Thank you, ill give it a shot tomorrow since im at work now. Ill try it on a spare p59 that i have so i dont brick the original.

[In-Tech]

Do a full clone to your spare with the stock file and then see if it will run, otherwise will have to turn off the vats

[Mudsport96]

Yeah i was going to clone the stock file then write your modded one to it.

Funny thing is the notation under my user name says carb and points... I can tune those in my sleep haha. Even when it was 10 degrees last month the nova fired off with one pump to set the choke.
This stuff is a little more complex

[In-Tech]

Any luck?

[Mudsport96]

Sorry for not updating. Had some family problems, will be another day or 2 before i can give a confirmation on whether it worked or not. I am eager to try it, just was forced into the non-priority pile for a few day.

[In-Tech]

No worries, just curious.

[Mudsport96]

Ok. I bench flashed the ecm and it took. Reread it and its good, just have to get time to swap out the computers and i can give a final answer. Thanks for your patience.

[Mudsport96]

Well, i copied the original ecm. Recalibrated it with the trans modded file and the vats wont let it start. So, ill start over by just copying the original again and see if it starts that way. Then retry the trans flash file.... i did see today there is a tsb on the factory os to have it updated. Don't know if they will honor that 15 years later though lol.

[Mudsport96]

Ok update, so if i just clone the ecm it starts and runs fine. But the shift mod tune it does not start.

[In-Tech]

Clone the pcm like you did, then just do a calibration only write to that and all should be fine.

[In-Tech]

If you still have problems, I'll clone a pcm here to your .bin and then throw my mods on top of it and re-post the .bin file. I'm not sure how pcmhammer does the calibration write process, maybe it doesn't work like I think. There is 8 modules inside besides the parameters section where your vin, serial, cam sync, vats, etc is located.

[In-Tech]

I am not 100% confident this is a file that will allow a restart because pcm hammer does a clear codes at the end which may or may not require a VATS relearn and/or cam sync learn. Let me know. This should have all of your parameters included. Do a full clone flash.

[In-Tech]

The "clear codes" is a thing I am still researching.

[Mudsport96]

Ok, ill try again in a few hours have a few errands to run and hopefully i can do it before work. Thank you again for your help and patience.

[In-Tech]

Did you get a chance to try it yet?

[Mudsport96]

I have flashed it to the spare ecm and it went well, but i have not gotten to put it into the truck as of yet. I work an odd schedule and my daughter drives it to work, and i leave for work before she gets home. Im going to try to swap it out tonight when i get home, its been rainy all weekhere and im afraid of melting lol. Sorry for the delay

[In-Tech]

oh, it doesn't show anyone downloaded the latest file I did for you yet is why I was curious.

[Mudsport96]

Bloody hell, you are right. I wonder what the hell i flashed to the ecm then... ill reflash on lunch break since i happen to have my bench setup with me. Working between 70 and 8 hours a week gets things confusing lol

[Mudsport96]

Well it starts runs and drives on the last file you posted. And it seems to shift a bit better. It usually takes a few drive cycles to even out so i will update in a day or so. Thank you again.

[In-Tech]

Progress :) Yes, it takes quite a few drive cycles for the adaptives to "sync". Drive it normal and aggressive, also with the tow/haul mode active. What I did isn't super aggressive, kind of a rv shift kit. I also altered the 2-1 shifting since the factory has it lug in 2nd unless you wood it. Post back when you can.

[Mudsport96]

Well it seems to be shifting like it should have been all along. The odd part is, it shifts almost identical to my 06 tahoe now... which is stone stock minus an airaid intake pipe.
Now why would two vehicles both 2006s both 5.3s 4l60e and 3.42 gears with the same tire height be programmed to shift so dramatically different from the factory?

[Aedakin]

Question, do Ya'll have an XDF for the 7811? I have not been able to find one, but it would definitely be handy. Been told to try the 7603 but I can't seem to disable the VATS with it using 3 different tuner apps.

[Mudsport96]

No i dont have one for 7811. Would be nice though, to see the difference between an LM7 tune and an L33 tune. Would love to enable flex on my L33 truck and swap in flex injectors with the current fuel prices ya know.

[Aedakin]

I think I'll end up making my own. Might be a while since I've never done it and been kinda busy lately. Will probably start with a Universal Patcher XDF and build from there.