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Texasdriver

By Texasdriver
in Ask A GM Technician

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Texasdriver Enthusiast

Texasdriver

Posted
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Posted

Thanks Karnut, I will try that. I have put it in manual before and just ran through the gears with the thumb shifter, and it was fine, no jerk, or lag at all. Didn't think about starting out in m5 and just leaving there until I am above 55.

Coy9901 Enthusiast

Coy9901

Posted
Posted

My truck had the EXACT same problem!

 

I called the dealership within the first few days of ownership. They made an appt for me 4 or so days later. Long story short..., my truck was in the dealership for 21 days. They replaced a few items (all transmission related) until they finally found what the 'real' problem was. The 'real' problem was my torque converter. I wish I knew more about mechanical things to remember what else they replaced that wasn't the problem. I remember going to check in my truck one day and they showed me this piece that they replaced from my transmission that looked like a pac man board...., ha...., whatever that thing is.

 

Anyway, my truck shifts how it's supposed to now. Yours won't until you get it to a more responsible dealership, IMO.

 

Good luck

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Yes it's the six speed. The tune made a big difference but didn't completely cure it.

 

Not sure if it can be captured or not, and also do not know if you have just the tune from blackbear or you have the device (cannot recall the name) that can load programs into pcm. If you have the device, can it capture the trans activity to help Justin to try and fix it? If the tune was done at one of the tune meetings, your truck would not have been cold enough to duplicate the issue. Maybe a capture of a cold run will show something.

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

He saw it on the log. It's a common problem on the trans and some guys have gotten new valve bodies to fix it. I don't feel like dealing with it. The dealer couldn't duplicate it so I'm not wasting my time. It's clearly not hurting anything if it's gone 60k miles.

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

He saw it on the log. It's a common problem on the trans and some guys have gotten new valve bodies to fix it. I don't feel like dealing with it. The dealer couldn't duplicate it so I'm not wasting my time. It's clearly not hurting anything if it's gone 60k miles.

 

I would think it would shorten the life of the clutch pack and/or band by having it slip during gear change. It will also run the tinniest bit warmer as well. As long as hydraulic parts are not slipping after you feel the flare up go away, it will not likely hurt anything in the short run. Chances are you will give up the truck before the trans gives up on you.

 

If it was me, I would likely have had it fixed. I am one of those that once I find something, and also find out how to make it happen, my driving pattern will change to make it happen every time. I am not one to change driving habit to make it stop.

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

I know what makes it happen. It does it when cold. It did it going to and from the dealer. They just were lazy or whatever. The truck is being replaced next year so I could care less since it'll be under warranty still. My time is too valuable to continue wasting time on a issue that isn't my problem

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