Disable V4 mode?

[fishrman]

8 hours ago, Grumpy Bear said:

Did you know that when the AFM cycles the torque converter clutch cycles to buffer the exchange? You can't actually feel the AFM. You are feeling the TC clutch. 

So once it warms up, you don't feel the clutch anymore? Would changing the fluid out to Mobil 1 make a difference in the 6 speed too?

[Grumpy Bear]

2 hours ago, fishrman said:

So once it warms up, you don't feel the clutch anymore? Would changing the fluid out to Mobil 1 make a difference in the 6 speed too?

 

I doubt changing to Mobil 1 will do anything as Mobil is the supplier for AC-Delco aka same fluid in a different bottle.

 

The TCM is loaded with a learning program and will adapt to a degree based on your driving habits and conditions. It takes time and it takes consistency. A machine like consistency.  

 

I can't sense what you are feeling. I think mine works very well but if you drove it you might think it lacking in some way. I might drive yours and find acceptable. Who knows, right? 

 

I use Red Line D-6 fluid and run it cold like the pre 2014 6L80-E's. No thermostat and I run a colder water thermostat. Thing is, mine was not a bad actor from day one. I did notice it adapt to things like my use of cruise control by lowering the ramping rate to match my moderate pace. Not racing to get to speed. I noticed over time less slip over demand in the first three gears. The shifts tightened up some. I've learned as well. When I find a spot that is wonky I avoid it. 

 

Example, I come into a town that has a 40 mph speed limit. I toggle down from 55 to 40 and when it hits that speed the AFM kicks back in and the clutch slips to accommodate the change and speed logic says to drop a gear. Thing is the timing of this event happens just as the grade starts to rise and it would be caught unaware locking up the converter just as it needs to unlock resulting in an awkward 'lugging'. 

 

Okay I know this so now I kill the cruise and re-engage it at 38 mph and at the start of the rise triple tap it to 41 mph forcing it to unlock before the grade. It unlocks and pulls the grade smooth as silk. 125 K on this box and it's been a sweetheart. We understand each other. 

 

 

I have heard from several people that Lubgard Red added per instructions has help some users well enough it's starting to get a favorable reputation. I...personally, haven't tried it. Have no need to. NAPA carries it. Worth a try and it's undetectable to the bean counters. It's a friction modifier. 

 

 

 

 

[fishrman]

15 hours ago, Grumpy Bear said:

 

I doubt changing to Mobil 1 will do anything as Mobil is the supplier for AC-Delco aka same fluid in a different bottle.

 

The TCM is loaded with a learning program and will adapt to a degree based on your driving habits and conditions. It takes time and it takes consistency. A machine like consistency.  

 

I can't sense what you are feeling. I think mine works very well but if you drove it you might think it lacking in some way. I might drive yours and find acceptable. Who knows, right? 

 

I use Red Line D-6 fluid and run it cold like the pre 2014 6L80-E's. No thermostat and I run a colder water thermostat. Thing is, mine was not a bad actor from day one. I did notice it adapt to things like my use of cruise control by lowering the ramping rate to match my moderate pace. Not racing to get to speed. I noticed over time less slip over demand in the first three gears. The shifts tightened up some. I've learned as well. When I find a spot that is wonky I avoid it. 

 

Example, I come into a town that has a 40 mph speed limit. I toggle down from 55 to 40 and when it hits that speed the AFM kicks back in and the clutch slips to accommodate the change and speed logic says to drop a gear. Thing is the timing of this event happens just as the grade starts to rise and it would be caught unaware locking up the converter just as it needs to unlock resulting in an awkward 'lugging'. 

 

Okay I know this so now I kill the cruise and re-engage it at 38 mph and at the start of the rise triple tap it to 41 mph forcing it to unlock before the grade. It unlocks and pulls the grade smooth as silk. 125 K on this box and it's been a sweetheart. We understand each other. 

 

 

I have heard from several people that Lubgard Red added per instructions has help some users well enough it's starting to get a favorable reputation. I...personally, haven't tried it. Have no need to. NAPA carries it. Worth a try and it's undetectable to the bean counters. It's a friction modifier. 

 

 

 

 

Can the Lubgard Red be added without taking any fluid out? Do you think this could help with my situation?

[Grumpy Bear]

6 hours ago, fishrman said:

Can the Lubgard Red be added without taking any fluid out? Do you think this could help with my situation?

Remove via the dipstick a like amount. And 'maybe" . What it wont do is hurt anything. 

[fishrman]

17 hours ago, Grumpy Bear said:

Remove via the dipstick a like amount. And 'maybe" . What it wont do is hurt anything. 

How do I remove via dipstick?

 

[Grumpy Bear]

2 hours ago, fishrman said:

How do I remove via dipstick?

 

Siphon. Suction gun. 

[carnau]

On 8/13/2020 at 1:26 PM, fishrman said:

Sooo, this is something that cost about 200.00 bucks to disable the 4 cylinder option? Not sure it is worth that to me when Chev. built it the way they built it. Seems like it should be their problem and not mine! 

Which part is their problem? You purchased a truck knowing it had the option. That's like buying a Pepsi and saying it should have Coke in it...

[fishrman]

1 hour ago, carnau said:

Which part is their problem? You purchased a truck knowing it had the option. That's like buying a Pepsi and saying it should have Coke in it...

Not from my point of view. I purchased the truck believing that it would run nice and smooth whether it be in 4 cylinder mode or 8.

[Chicken Heart]

OK- - - no I didn't know my 2016 GMC 1500 had this V-8 to V-4 mode.  So if I run in the M range in 5th gear the drone and the V-4 mode goes away?  Is that what I have read?  I actually didn't' know what the M was for cause it also has the TOE mode.  But I am having fun with it!!   It's actually in the shop for the everyday electrical / modem issues that affect all of the 2014--2018 1/2 ton trucks.  yuck!

[Hdwrguy]

This is an old post, but I wanted to add my 2¢ to the subject.  I recently purchased and installed the Range Technology AFM disabler.  My truck stays in V8 mode all of the time now.  No more jerking when you speed up.  I installed it due to fear of lifter issues in my 5.3 V8 engine.  I love it so far and is just plug in and forget.  That is unless you won't be driving the truck for awhile, then you need to unplug it to eliminate any battery drain.

[Chicken Heart]

I simply use the "M" mode and don';t worry.  Seems to work just great.  Not sure if it goes into the V4 mode when in 6th on the "M" mode.  

4th for stop and go and 5th if I got to run a distance.  

[Zac98]

Is Range the best option for the afm delete? Does the color matter? Will I even see it to worry about what color it is? 

[mikeyk101]

7 hours ago, Zac98 said:

Is Range the best option for the afm delete? Does the color matter? Will I even see it to worry about what color it is? 

Not really a delete, but a disabler. Plug it in, no V4. Pull it out, V4 works again. Color is a personal preference. I have one that has green lights but not for any real reason but really don't pay attention to it. 

 

Just one thing to mention if you live in an area that does emissions testing. Unplug it at least a couple days before and drive the truck a few times or it will fail the emissions testing.

[Michael Gal]

They tell me the shudder I am experiencing is due to the 8cyl., wanting to go to 4 cyl. when I first start up my vehicle after it sits for a period of time. I notice this at around 30 to 35 mph. After a short period of time, it will not shudder

Responding to these comments about the shuttering

My trans failed (Torque converter ate it's self. After have the trans rebuilt. But before that I have had issues where the intervals of trans oil service were getting closer together

I had noticed the temp of the trans oil hovered around 190 + and when I was pulling my motor home the temp would go over 210. After the rebuild I was still having the same issue with the temps. The thermostat was full of the torque converter. The replace it and the temps came down to the 140 to 150 and pulling the trailer would jump to 180 with the trailers.  Now because of the temp issues I had the rebuilder lock out the slipping program built into the software. it shifts more like a manual transmission Now. This also lowered the trans temp because the slippage was increasing the temps. 

About 5 k after the trans was rebuilt the shuttering developed. It went away at 74 mph 

They told me that the left motor mount was broken causing the shuttering. 

Just had the mount replaced and the shuttering is still present.

Only my Shuttering is happening now in V4 and V8 mode

I've noticed that I have a low RPM miss this will cause the shuttering  #1 #2 & #8 cylinders 

one of these cylinders are the V4 mode

Follow up if replacing the injectors fixes the problem 

[MikeBMW]

I dunno, I tuned out the V4 mode as soon as I bought mine when it had 77,000 miles.
No issues here but I'm interested with what you find out!