Highest mileage 8L90?

[NWI Denali]

Just curious who's got 100k or 200k on their 8 speed? Just getting my truck paid off now and at 74k miles, really worrying about the long-term reliability of the 8 speed and wondering if I should trade now while it's still worth something. Had a new valve body at 18k and the new mobil 1 atf at 54k to solve the shuddering. All good so far since   

[m3n00b]

Subbed.  I only have 43k on mine.  Had a temperature sender replaced and updated fluid to solve shuttering around 30k.    

[Bill Gutman]

Have just over 300,000 my 2018 no problems yet. I just have regular  schedule  matinace  done

[NWI Denali]

1 hour ago, Bill Gutman said:

Have just over 300,000 my 2018 no problems yet. I just have regular  schedule  matinace  done

That is incredible. I love to hear that.

[15 Z71]

On 4/3/2023 at 11:50 AM, NWI Denali said:

Just curious who's got 100k or 200k on their 8 speed? Just getting my truck paid off now and at 74k miles, really worrying about the long-term reliability of the 8 speed and wondering if I should trade now while it's still worth something. Had a new valve body at 18k and the new mobil 1 atf at 54k to solve the shuddering. All good so far since   

I don't have the 8 speed I have the 6 speed mine,it is a 2015. Want to keep mine for another year and worry about the same thing

 I'm at 107,000 now still seems to be fine. (I know your question was about the 8 speed....just getting at I worry about the same thing)

[Cupton]

Just hit 60K the other day in my 2018 Sierra, 8 speed. Ive got another year and its paid off so I'll probably be about the same mileage as you are right now when that time comes.   Other than the usual noises when going in and out of reverse, I dont have any complaints. Shifting is nice and smooth when she's going. 

[15 Z71]

BTW......which one is has the least problems the 8 or the 6 speed?

[NWI Denali]

1 hour ago, 15 Z71 said:

BTW......which one is has the least problems the 8 or the 6 speed?

The 6 and 10 speeds are both way less troublesome than the 8 speed

[DDogg]

I'm at 230 000 km on my 2015.  It's clunky (especially when I put it in reverse) but still doing the job.

[James Beyer]

110k on my 2018, 8 speed.

[Custom 68]

117k on my 2017. Fluid update change and a temp sensor replaced

Edited May 12 by Custom 68

[SuperOldSchool]

130k on my 2015 8L90.

fluid and filter changes every 45k.  New temp sensor/harness at 100k.