2-3 shift flare, driving me crazy

[zedbear]

Anyone know if there is a fix for this? 2013 Sierra, 5.3L, 6 speed auto. I bought it last winter. It now has about 12K miles. Not overly impressed with the transmission performance in general but its had this 2-3 shift flare almost since day one and seems to be happening more often now. It usually does it when the transmission temp is under 100F but sometimes over that temp. It doesn't do it every time. The only time I know it will happen for sure is when I come home and park the truck for an hour or so and then drive away and it happens during the first 2-3 shift every time. When the flare occurs, it almost feels as if the transmission goes into neutral for a second and the rpm jumps way up.

 

The shift quality overall kinda sucks. Driving it around town is a chore. I know a tune would helps things but this 2-3 thing seems like there is something wrong........

[MikeNH]

Mine has done this since new and unfortunately the dealer didn't seem interested in doing anything about it, claiming it was not able to duplicate the flare (even though it happened on my way out of their lot). I know it isn't what you want to hear but on the cooler days like we're starting to get, I'm just easy on the throttle until the truck warms up.

[RyanbabZ71]

I had this until I had my truck tuned.

 

 

Ryan

[zedbear]

I did some research before and found a few references to a tsb regarding this problem but i think it only applies to models from a few years ago. I like the idea of a tune but am afraid of putting the warranty at risk....

[Badass69]

I am sure that the tsb does change up to 2011. It is suffixed alphabetically and I did find a newer one before. I hate searching on my phone so I can look later. Common problem but the o ring tsb doesn't necessarily fix it either if you find someone willing to perform it.

 

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[zedbear]

What is involved with this o ring repair?

[Badass69]

Apparently dropping the trans for whatever reason and removing the entire valve body. I have never had a 6 speed apart so I don't know exactly if it can be done in the truck or not.

 

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