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2010 Silverado, Transmisson Slipping

tenaciousj

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tenaciousj Enthusiast

tenaciousj

Posted
Posted

2010 silverado 2500

6.0L

6 speed auto

1200 miles

 

when i first pull out of the driveway in the A.M. (after the engine has reached 210) the tranny slips just for a second when shifting from 3rd to 4th. it only does it when the truck has sat overnight. after that initial slip, it will shift just fine all day long.

Shatterz Enthusiast

Shatterz

Posted
Posted

What you are experiencing is most likely a shift "flare" where the rpms rise say 200-300 rpm betweem the shifts and there is a delay between 3-4

 

These 6l90E transmissions have been gaining a reputation for this issue. The most common is the 2-3 shift flare (which btw my truck has been experiecing for snice I bought it april '09). But I have also heard of and experienced this conidtion on thr 3-4 shift.

 

There is a TSB out for this shift flare issue, which the ypsilant transmission plant (where most of these are built) has implemented a fix on all trans built after 10/23/08. Well apparently there are still a lot of trans built after this date that still have the same issue. Supposedly the issue deals with the clutch fluid seal rings which were either not installed correctly, nicked, and the entire assembly in which these seals ring seat was not machined properly. causing this shift flare or slip.

 

A trip to the dealer seems to yield little satisfaction in regards to this issue, with the most common explanations being "all these six speeds trucks shift different and it is jst the computer adjusting to driving coniditions. My truck has either a 2-3 or 3-4 shift flare several times per week. 3 seperate ride alongs with a tech have been unable to duplicate the issue ( nothing happens when YOU want it to). The dealer is ware of the issue tell me if they can't replicate it they can't do anything. The best answer they can give me is keep driving it, you have a 5 yr powertrain warranty and "just hope it grenades itself and then we can give new a new transmission. I don't think this is an accpetable answer to anybody and an currently trying to get GM to send an engineer out to take a look at my truck and discuss how this can be resolved, but I am not making much progress

 

Sorry for the rant but you may be experiencing the same issue. Oh and this conidition is supposedly most likely to occur with a "cold" transmission which would make sense in your case as you are just pulling out the driveway.

matsrat Enthusiast

matsrat

Posted
Posted

if you keep having an issue. bring it in and get a work order. even if they find nothing, if you have 10 work ordersand your transmission fails or slips in the future. it will be preety tough for gm to not help you out. seeing that you have brought it in multiple times for the same issue. hope this helps...good luck!

tenaciousj Enthusiast

tenaciousj

Posted
  • Author
Posted

just got back from the shop (dealer)

 

i was told that there is nothing wrong and that what i was experiencing is simply the torque converter engaging/disengaging.

 

i am not entirely satisfied with this answer and am going to contact other area chev service departments.

 

by the way, does anyone know where i can find the TSB that adresses this issue so that i can reference it by number?

jro909 Senior Enthusiast

jro909

Posted
Posted

trans slip to warm up the drivetrain when the truck is cold, my truck will rev pretty high before shifting if its far below operating temp

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted
just got back from the shop (dealer)

 

i was told that there is nothing wrong and that what i was experiencing is simply the torque converter engaging/disengaging.

 

i am not entirely satisfied with this answer and am going to contact other area chev service departments.

 

by the way, does anyone know where i can find the TSB that adresses this issue so that i can reference it by number?

 

Sometimes service advisors use words that they think will be over the customers head and will allow them to move on. Yours is one of those. I love it when they do that to me.

 

I am a licensed mechanic, have been since the very late 70's, spending the majority of my career on Dodge transmissions. Does the convertor lock up in 3rd gear in the 6 speeds? Does it even lock up in 4th? If you are simply experiencing the TC engaging/disengaging, then it must be defective. TC do not engage/disengage. They are never in a neutral state if in correct repair. The mere fact that it is disengaging means it is defective and must be replaced.

 

Does the lockup even happen on a cold engine anyways?

 

Leave the truck there overnight, and insist that you be the one to drive the truck FIRST thing in the morning. Make sure the truck is left outside, and if possible, you take the keys home (I have actually had a dealer drive the car before I got there once, thus negating the first run in the morning issue, caught them by the mileage). Take the trans tech out before the dew is off the truck and show him the issue. Do not be afaid to pepper him/her with questions if they try to sluff it off as being just the TC engaging/disengaging if you know the TC does not lock up in those gears at that engine/trans temp normally.

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