2013 Tahoe with possible transmission issues

[CocoH103]

Hi all. New here. I have a well taken care of 2013 2wd LS Texas Edition with 89k miles that I purchased a few weeks ago and I’m worried that the transmission is about to fail. Symptoms are listed below.

What I’ve noticed:

-Occasional power surge when upshifting typically from 1st to 2nd
-When cruising in 6th gear between 40-50mph and steady throttle, the RPMs will fluctuate (almost like the torque converter can’t decide whether it wants to lock or unlock) and of course this stops when I give it gas
-While driving, if I need to go around someone, I have to give it a lot of gas (sometimes to half throttle) so it’ll downshift and accelerate
-Rough idle

Trans fluid is full, clean, doesn’t smell burnt and looks relatively new. Trans temp is also seemingly normal. I have a SnapOn Ethos and did a deep dive into it and there are zero codes.

Here’s what it’s not doing:

-No issues off the line
-No “hard” shifting but shifting can be more pronounced at times
-Doesn’t seem to be slipping
-No clanks or clunks
-No jerks or lurches
-No loss of power and isn’t sluggish

Any insight will be more than appreciated.

 

[donjetman]

Hi all. New here. I have a well taken care of 2013 2wd LS Texas Edition with 89k miles that I purchased a few weeks ago and I’m worried that the transmission is about to fail. Symptoms are listed below.

What I’ve noticed:

-Occasional power surge when upshifting typically from 1st to 2nd
-When cruising in 6th gear between 40-50mph and steady throttle, the RPMs will fluctuate (almost like the torque converter can’t decide whether it wants to lock or unlock) and of course this stops when I give it gas
-While driving, if I need to go around someone, I have to give it a lot of gas (sometimes to half throttle) so it’ll downshift and accelerate
-Rough idle

Trans fluid is full, clean and looks relatively new. Trans temp is also seemingly normal. I have a SnapOn Ethos and did a deep dive into it and there are zero codes.

Here’s what it’s not doing:

-No issues off the line
-No “hard” shifting but shifting can be more pronounced at times
-Doesn’t seem to be slipping
-No clanks or clunks
-No jerks or lurches
-No loss of power and isn’t sluggish

Any insight will be more than appreciated. A pic of the truck is below.

Welcome
Always include @NickTransmissions when asking tranny questions. He's our resident tranny guru.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

I cannot personally assist you with your issue, but other members of this Forum much more knowledgeable than me in this area will chime in.

It does sound like a transmission/torque converter issue, but @NickTransmissions will be able to ask some clarifying questions that will help you in your troubleshooting.

 

[NickTransmissions]

Hi all. New here. I have a well taken care of 2013 2wd LS Texas Edition with 89k miles that I purchased a few weeks ago and I’m worried that the transmission is about to fail. Symptoms are listed below.

What I’ve noticed:

-Occasional power surge when upshifting typically from 1st to 2nd
-When cruising in 6th gear between 40-50mph and steady throttle, the RPMs will fluctuate (almost like the torque converter can’t decide whether it wants to lock or unlock) and of course this stops when I give it gas
-While driving, if I need to go around someone, I have to give it a lot of gas (sometimes to half throttle) so it’ll downshift and accelerate
-Rough idle

Trans fluid is full, clean and looks relatively new. Trans temp is also seemingly normal. I have a SnapOn Ethos and did a deep dive into it and there are zero codes.

Here’s what it’s not doing:

-No issues off the line
-No “hard” shifting but shifting can be more pronounced at times
-Doesn’t seem to be slipping
-No clanks or clunks
-No jerks or lurches
-No loss of power and isn’t sluggish

Any insight will be more than appreciated. A pic of the truck is below.

What was TCC Slip speed when TCC duty cycle was at or near max?

 

[donjetman]

 

[CocoH103]

What was TCC Slip speed when TCC duty cycle was at or near max?

I honestly don’t remember, as it was last week when I dove into it. I’ll hook it up, drive it and get those readings again when I get home. Will report back this evening.