TRNW-2: 16 model 62te lock up theory

[Tod Chretien]

Those pancake torque converters are high failure, but... Usually a 
coast-down bump is caused by high UD cvi when the inner side of the 
piston gets grooved. Does the bump go away for a while after you do a 
quick learn?

-- 
Best Regards,
Tod Chretien
TRNW Inc.
https://www.trnw.net

On 6/4/2025 8:09 AM, Justin Merritt via trnw2 wrote:
> Hello all,
> i have a new job here on a 2016 grand garavan 62te.  i do these 
> transmission fairly regular and have great success. This is a new job 
> that i have not worked on yet, but i am trying to wrap my mind around 
> the theory of what i am feeling (customer complaint) on my diagnoses.  
> I have a cost down hard bump that seems to be doing something with the 
> converter at around 38 mph.  I do feel an unusual lock up engagement 
> also, but not near as bad as the unlock i am suspecting.  I am 
> confident that the transmission is at the early stages of a converter 
> failure, but i am trying to school myself on what is going on before i 
> pull to rebuild.  I am including a screen shot of shop stream data 
> that shows the converter slip going deeply negative when i feel this 
> bump.  Anyone can explain the mechanical theory behind what i am 
> seeing?  the vehicle has not set any codes yet.
>
> Thanks Justin
> image.png
>
>
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