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I have that same issue, but very intermittently as well. I'd hesitate to put a frequency to it but my guess would be maybe once every couple of months and I do think its 2nd to 3rd.


I'd forgo some of the smoothness for something a little more crisp as well if that were an option.
 

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It should have been 6l80etuning.com
 
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I have that same issue, but very intermittently as well. I'd hesitate to put a frequency to it but my guess would be maybe once every couple of months and I do think its 2nd to 3rd.


I'd forgo some of the smoothness for something a little more crisp as well if that were an option.



I know if we can find someone to tune these we can get a little more crisp shift. I've had 4ls tuned before and just tuning did about the same thing as a shift kit. Now knowing the trans has to be pulled to install Transgo kit makes the tuning even more viable...if we can find someone that knows how to do it in a diesel. I've talked to the guys that tune the 6l for high horsepower gas applications. From what they have told me the tune is just as important as the hard parts in these.



The slip was supposedly fixed back around 2010 in these, at least from what was doing it back then. What is doing it in ours I wish I could find out!
 

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I know if we can find someone to tune these we can get a little more crisp shift. I've had 4ls tuned before and just tuning did about the same thing as a shift kit. Now knowing the trans has to be pulled to install Transgo kit makes the tuning even more viable...if we can find someone that knows how to do it in a diesel. I've talked to the guys that tune the 6l for high horsepower gas applications. From what they have told me the tune is just as important as the hard parts in these.



The slip was supposedly fixed back around 2010 in these, at least from what was doing it back then. What is doing it in ours I wish I could find out!
No doubt the tune would make a good improvement, but, in the end, if you want higher line pressure and more evenly distributed clamping force you have to look at some hard part change outs. Transgo has always done an excellent job of looking at how to improve fluid distribution, if you couple that with a better boost valve and apply piston you could really make use of tuning improvements..
 

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Since it does not do it every single time it is driven then that is a hard part issue. All a tune is going to do if you are lucky is mask the problem. Here is what Transgo Jr is suppose to fix.

"Fixes Extreme Pressure Damage Due to Worn Pressure Regulator Valve Bore, Restores proper Pressure Regulator and Solenoid Regulator valve function. Convenient drop in valves, No special tooling or machining necessary! Repairs included for blown pressure switches! Has EPC relief assembly to protect against excessively high pressure! Improves and restores correct drivability with added durability."

The 2.8 duramax has the 6L50 behind it and that is in the same family. I know some of the tuners were doing the transmission also. Some people liked the tuning while others said stock was better. I would not tune a transmission unless I knew for sure everything mechanical was 100%.
 
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Part of reason I want a tune is the way this downshifts too. For example, driving along at 35mph and come to a hill. It's running low rpm so needs to downshift. Instead of downshifting one gear it drops down 2 gears. This sends rpm much higher than it needs to be.



If the trans didn't have to be pulled to install Transgo I'd do it. I don't expect this trans to have a long happy life anyway though. Between the flared upshifts and sometimes very harsh downshifts coming up to a redlight I think it has problems. It has done all this from day one and has less than 100,000 on it. I may have gotten bad parts in mine from the get go. A quick search online brings up 100s if not 1000s of others with the same issues in pickups though.



My trans runs way to hot at idle I did notice. I had it running today while leaving a job talking to someone. Ran for an hour or so in 33 degree temp outside. Trans was 188 when I left. Anything over about 170 trans temp and this thing shifts awful. It flares the shift really bad between first and second and then second and third. 4rth gear hit really hard. It never got above 150 towing in the summer so not sure why it gets so hot at idle not working.
 

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Part of reason I want a tune is the way this downshifts too. For example, driving along at 35mph and come to a hill. It's running low rpm so needs to downshift. Instead of downshifting one gear it drops down 2 gears. This sends rpm much higher than it needs to be.



If the trans didn't have to be pulled to install Transgo I'd do it. I don't expect this trans to have a long happy life anyway though. Between the flared upshifts and sometimes very harsh downshifts coming up to a redlight I think it has problems. It has done all this from day one and has less than 100,000 on it. I may have gotten bad parts in mine from the get go. A quick search online brings up 100s if not 1000s of others with the same issues in pickups though.



My trans runs way to hot at idle I did notice. I had it running today while leaving a job talking to someone. Ran for an hour or so in 33 degree temp outside. Trans was 188 when I left. Anything over about 170 trans temp and this thing shifts awful. It flares the shift really bad between first and second and then second and third. 4rth gear hit really hard. It never got above 150 towing in the summer so not sure why it gets so hot at idle not working.
It’s always possible you have a bad trans from day 1, think of how many 6l90’s GM has made.
I don’t have any gauges so I have no idea on my temps to compare.
 

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Part of reason I want a tune is the way this downshifts too. For example, driving along at 35mph and come to a hill. It's running low rpm so needs to downshift. Instead of downshifting one gear it drops down 2 gears. This sends rpm much higher than it needs to be.



If the trans didn't have to be pulled to install Transgo I'd do it. I don't expect this trans to have a long happy life anyway though. Between the flared upshifts and sometimes very harsh downshifts coming up to a redlight I think it has problems. It has done all this from day one and has less than 100,000 on it. I may have gotten bad parts in mine from the get go. A quick search online brings up 100s if not 1000s of others with the same issues in pickups though.



My trans runs way to hot at idle I did notice. I had it running today while leaving a job talking to someone. Ran for an hour or so in 33 degree temp outside. Trans was 188 when I left. Anything over about 170 trans temp and this thing shifts awful. It flares the shift really bad between first and second and then second and third. 4rth gear hit really hard. It never got above 150 towing in the summer so not sure why it gets so hot at idle not working.
So once again you feel you know what the best tuning should be. You actually own a tool that can change that but instead of putting your expertise to use you choose to go on and on about about how bad GM is. You have 100,000 miles on a transmission with added power and you tow more than what the mfg recommends but it is gonna have a short life because GM is wrong ?
Seriously, you sound like the short haired soccer mom that complains about everything.
 

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You don't seem to know or understand anything about the newer operating systems. Trans tune requires being in the ECM as well which I can't do. Just because you were able to tune older stuff means nothing. I have older vehicles. Everything is much easier. If it were as easy as you think it is there wouldn't be 1000s of people trying to figure the 6l out on their own. The 4l operates and shifts completely different than a 6l. Every reputable trans shop building the 6l for more power requires a tune for warranty. If GM was so perfect that wouldn't be the case. They would just be putting hard parts in and calling it a day. Every trans tuner I have talked to about the 6l has said they would have to work with engine tuner to write part in the ECM. The only problem I have had with them is none of them knew how to work with a diesel engine with the 6l. I have also proved that GM does make mistakes in trans programming by previous experience. It took several years for that fix to come out.



By my "complaints" I am voicing problems with these that multiple people have issues with. A quick internet search reveals a ton of problems with 6l, a lot similar to the issues I have going. I thought this was a forum for helping each other out. Guess I was wrong. Just reading up this thread proves others have some of the same problems.



Nowhere did I say I had 100,000 miles on the trans. I said it was under 100,000 miles. Which by the way is the number GM engineering shoots for in trans life. I am currently at 50 something and have had issues since day one, long before any engine tune was installed.



It is possible that I have had a bad trans since day one. But the issues I have are pretty common problems. Joey if you don't have issues with your 6l count yourself lucky I'd say. Hopefully yours continues to give you no trouble. The forums are full of truck owners chasing some of the same things I have. The dropping two gears at once seems to be a diesel thing though, at least as far as I can tell.
 

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It is possible that I have had a bad trans since day one. But the issues I have are pretty common problems. Joey if you don't have issues with your 6l count yourself lucky I'd say. Hopefully yours continues to give you no trouble. The forums are full of truck owners chasing some of the same things I have. The dropping two gears at once seems to be a diesel thing though, at least as far as I can tell.
Can you clarify the dropping two gears at once? When it happens or more specific instance. I don’t know of any other diesel vans around me but I do have plenty friends with gas vans or pickups and trans issues don’t seem to common, and that doesn’t mean you don’t have any.
What are you monitoring trans temps with?
 

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Can you clarify the dropping two gears at once? When it happens or more specific instance. I don’t know of any other diesel vans around me but I do have plenty friends with gas vans or pickups and trans issues don’t seem to common, and that doesn’t mean you don’t have any.
What are you monitoring trans temps with?



Going up a hill where a vehicle needs a little more power due to low rpm it would normally drop from 5th to 4rth or 4rth to 3rd. Mine drops straight from 5th to 3rd under very little throttle. This sends rpm much higher than it needs to be, and I'm then letting off the throttle to get it to upshift one gear.



One of the first things I did with less than 5k miles was put a deeper pan on the trans. It had a place for a temp sensor. I put the sensor in to read on the Edge monitor.
 

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Going up a hill where a vehicle needs a little more power due to low rpm it would normally drop from 5th to 4rth or 4rth to 3rd. Mine drops straight from 5th to 3rd under very little throttle. This sends rpm much higher than it needs to be, and I'm then letting off the throttle to get it to upshift one gear.



One of the first things I did with less than 5k miles was put a deeper pan on the trans. It had a place for a temp sensor. I put the sensor in to read on the Edge monitor.
It sounds like your throttle pedal is to sensitive, I’d say mine is the complete opposite and holds gears longer than my 06 DMax van did.
 

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It sounds like your throttle pedal is to sensitive, I’d say mine is the complete opposite and holds gears longer than my 06 DMax van did.



If it hadn't ran this way since day one that is what I would have thought as well. Engine tune didn't change anything in that department though
 

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We are all here to help each other but that can be difficult with certain people. How do you help people who claim to be smarter than everyone and all of us are wrong ?

If this has truly been an issue since day 1 then I would have had it covered under warranty immediately. 4 years and 50,000+ miles later smells a lil funny.

The tune warranty thing with rebuilt transmissions is to make sure you have latest OEM calibration.

Downshifts and revs to high ? What is the to high RPM ?

What are the trans temps as read with a scan tool ? Trucks came with a transmission thermal bypass but not 100% sure the vans did.

You are still overthinking the tuning and making it more complicated than it is.
 
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