How smoothly does your 6 speed accelerate?

[MichLakes]

I have a 2020 with the 5.3 6 speed 38k miles..  It’s always felt like it pulses in certain gears under moderate acceleration.  
 

I’ve wondered if this is normal?  It’s mild but I notice it.  
 

 

[diyer2]

Change the fluid is what I would try. 

I would recommend Amsoil. 

[Grumpy Bear]

13 hours ago, MichLakes said:

I have a 2020 with the 5.3 6 speed 38k miles..  It’s always felt like it pulses in certain gears under moderate acceleration.  
 

I’ve wondered if this is normal?  It’s mild but I notice it.  
 

 

 

Okay since the day you bought it. It still under warranty then. Have the dealer check it out with the scanner and make sure pressures and timing are correct. He'd be looking of internal leaks. Also, and If he will let you ride along ask when and it repeats to look at TIR. They feel soft if the timing is being pulled under increased torque situations. If it checks out then as @diyer2 notes. Your close anyway for a fluid change. AMSOIL ATF is a great product as is Red Line D6. 

 

[Rail Boss]

2019 Custom TB 5.3 6spd 27,000mi same problem especially when getting on the interstate, more noticeable with 500lbs or so in the bed. My experience as an auto mechanic makes me think its a fuel supply or pressure problem rather than a transmission problem, but guessing gets ya nowhere.  Keep me posted if you find anything. I am out of warranty by 8weeks, under by 9k mi, but seeing the dealer said no to covering my rear window leak under warranty, sure i'm on my own here too. Not a new problem, just never took it in for service because its a lease I had planned on trading in. Now i'm buying it so live and learn.

Edited August 15, 2022 by Rail Boss

[MichLakes]

On 7/18/2022 at 11:07 AM, Grumpy Bear said:

 

Okay since the day you bought it. It still under warranty then. Have the dealer check it out with the scanner and make sure pressures and timing are correct. He'd be looking of internal leaks. Also, and If he will let you ride along ask when and it repeats to look at TIR. They feel soft if the timing is being pulled under increased torque situations. If it checks out then as @diyer2 notes. Your close anyway for a fluid change. AMSOIL ATF is a great product as is Red Line D6. 

 

https://static.nhtsa.gov/odi/tsbs/2022/MC-10213032-0001.pdf
 

I wonder if that’s the issue.  

[Grumpy Bear]

4 hours ago, MichLakes said:

https://static.nhtsa.gov/odi/tsbs/2022/MC-10213032-0001.pdf
 

I wonder if that’s the issue.  

 

Worth a look. 

[MichLakes]

Dealer said everything is normal.  It may be a "shift flare" which is not an issue to be fixed.  The dealer also said a trans fluid replacement is not due until 70k miles.  My concern is I am at 58k.  Hopefully they documented my issue.