I finally after a lot of tweaking with my tuner got this 6L80 where it upshifts downshifts and feels the way I want it to feel.

It had some really quirky stuff it would do be it odd shift feel sometimes, sometimes harder than other for no reason etc that was never repeatable back to back dang near impossible to duplicate until the stars line up and it would act odd. It alway's had to do with a cycle of either normal to hard driving hard to normal driving a mix of city then long road trip at x hours you never could figure out the scenario that would make it act weird.

After tons of reading through my gm shop manuals and looking at how random it was based off of beat on it drive it easy vice versa then weird stuff shows up I think it was due to the adaptives. Now I understand they are there supposedly to let it learn your driving style and maintain consistent shifts etc. But IMHO with the garbage factory slushbox trans tune it probably does need adaptives to keep it alive. But I've got mine programmed for a nice solid shift feel, reduced tm bout 50%, upped shift points, tcc lock up delayed in all gears till road speed etc not really anything that should ever hurt the tranny if it were a quality piece to begin with.

So in closing I turned off every dang adaptive I could locate via hp tuners and all the gremlins are gone now. I've driven it several hundred miles with nary a hickup. It's nice it's like having a 4L80 with a shiftkit and 2 extra gears minus all the weirdness.

Can anyone see where turning all this bs off will hurt anything seeing as all the gremlins disapperared once doing so. Or further explain deeper into the theory of the adaptives. I'm after 1 shift feel, shift point all the time don't want stinking truck trying to learn it's way around my tuning.

 

This is awesome to hear ! This is how I want mine to shift.

I haven't looked yet at HPT trans tables for this and didn't know the adaptives could be turned off . Good to know .

Adaptive shift tables suck , I fought them a lot with my Built Allison in my previous Dmax , drive around town easy , then need to mash it would flare , I hated that , plus throw in the mix different power settings it would make pull out your hair .

So I would reset my TAPS with efi live in Tow haul mode , beat it like a step child till it shifted how I wanted , and I wouldn't touch T/H till I wanted performance .


Anyway in for discussion , and thanks for sharing , when I get the truck out after winter I'll have some tuning/playing to do .

 

Hmm that would be badass to try that's what makes me damn near pull my hair out every time I drive my truck the stupid shifting the trans tries to do. You can really notice that my trans is fighting what my tuner is commanding. My trans has lasted a good while tho under a lot of abuse. I'll tell you what tho this wierd shifting really makes me want to rip it out and put a 4l80 in there no joke. If this would make the trans shift like a normal trans I'm all for trying it.

 

I'll keep all updated but as of now been about 300 miles of varied driving and it's been fine. If I put it in tow haul and manual it does weird stuff namely a nasty wicked hard shift when you go to WOT above 65 and it downshifts. But if I leave it in drive and dont touch anything else it's dead nuts perfect for my daily driving tastes.

 

This might be a silly question, but is this something I could relay to black bear to incorporate into my autocal tcm tune?

 

I would venture to say it depends on your individual scenario and how it's behaving. In my case it fixed it but I would say it needs to be done on a case by case basis.

 

Talked to my good friend at the Chevy dealer , he turned off the adaptives via EFI live on his NNBS suburban and stated it cured the oddities /poor shifting . He loves it now and def reccomended it to me .

 

Any of you guys care to tell where all if these adaptives are? I'm new to te 6L and have noticed the same stuff. It constantly hunts for the right gear.

 

Do you have efi live or hp tuners?

 

HPTuner