Intermittent Shudder at 1000 to 1700 rpm

Jason92 · November 24, 2021

In need of some advice. So A week ago I noticed a what I thought was a miss. Turns out definitely not a miss but a shudder. 2014 5.3 with 6l80 and 120000 miles. I'm thinking this is torque converter related????? Will a flush help? Or do I bite the bullet and replace whole tranny? Oh also trans has been shifting ok. Once in a while I will get a hard down shift. This literally just happened over night. I have tried shudder gone stuff in red tube. I did filter and 6 quarts new fluid about 18 months ago roughly 30000 miles. Any advice/ help would be much appreciated. Basically do I spend the 350 for flush or 3 grand for new trans and torque converter?

steelerdude15 · November 29, 2021

Does it shudder only when its cold or all the time?

Also, with 120,000 miles on your truck, I would avoid doing any type of flush on your transmission.

silveradosid · November 30, 2021

my truck makes a moaning sound at the very same rpms as yours. started about 20k miles ago, i am at 150k now and it still going, also get a harsh down shift every once in a while. i know it is a time bomb about to blow, but at this mileage i am sure the tranny is full of crap from the torque converter so i wont waste my time flushing. also a 2014 with the 6 speed

UrbanRage · November 30, 2021

Sounds like the same problem I was experiencing with the 8 speed transmission. The dealership flushed the transmission in (TSB 18-NA-355). This seemed to help the shifting and shuddering. As far as paying for the flush or a new transmission, I would try the flush first.

silveradosid · December 1, 2021

the 8 speed flush does not work for the 6 speed

steelerdude15 · December 1, 2021

On 11/30/2021 at 7:21 AM, silveradosid said:

my truck makes a moaning sound at the very same rpms as yours. started about 20k miles ago, i am at 150k now and it still going, also get a harsh down shift every once in a while. i know it is a time bomb about to blow, but at this mileage i am sure the tranny is full of crap from the torque converter so i wont waste my time flushing. also a 2014 with the 6 speed

That seems to be a pretty common thing with our transmissions. Mine does it too. I would have to imagine that its a tuning issue. Have you had your TCM tuned?

silveradosid · January 28, 2022

Jason92 did you do anything to the transmission yet

djw88 · January 31, 2022

failing torque converter clutch. needs replacement and do it asap otherwise the material flying round in there can take out the rest of the transmission.

pokismoki · February 2, 2022

it could be the TCC o-ring is not sealing anymore, they usually start cracking and shrinking due to all the heat on the pump stator

try adding the prescribed amount of transmission seal conditioner as a last resort, other than this have a trans tuner remove the tcc function in gears 1-4th

Edited February 2, 2022 by pokismoki