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Highest mileage 8L90?

NWI Denali
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Toughknuckles New Member

Toughknuckles

Posted
Posted
On 4/5/2023 at 1:30 PM, DDogg said:

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

 

On 4/5/2023 at 1:30 PM, DDogg said:

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

 

Toughknuckles New Member

Toughknuckles

Posted
Posted
On 4/5/2023 at 1:30 PM, DDogg said:

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

Had the same thing and this might sound wierd but ive been pressing the brake way harder than normal then changing into reverse and have not have it happen since… i thought something was seriously messed with it but more brake pressure seemed to work

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  • 4 weeks later...
DDogg Enthusiast

DDogg

Posted
Posted
On 1/8/2024 at 4:03 PM, Toughknuckles said:

Had the same thing and this might sound wierd but ive been pressing the brake way harder than normal then changing into reverse and have not have it happen since… i thought something was seriously messed with it but more brake pressure seemed to work

I'm at 260 now and its still going!  I'll try the brake trick, but it clunks whenever it hits the lower gears.  Higher, not so much.

  • 2 months later...
Bill Gutman Enthusiast

Bill Gutman

Posted
Posted

Up date nearnig 400,000 miles just started to occasionally  to cunk shifting between 1st and second  gear. Last service they wanted to replace  temp sender. Passed on that will run it tell it breaks

GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted
On 4/17/2024 at 1:30 PM, Bill Gutman said:

Up date nearnig 400,000 miles just started to occasionally  to cunk shifting between 1st and second  gear. Last service they wanted to replace  temp sender. Passed on that will run it tell it breaks

We'd like to take the time to celebrate this impressive milestone with you for your 400,000 miles. To do so, please send us an email to [email protected]. We will watch for your email. 

  • Like 1
  • 2 months later...
Jeff Fliegel New Member

Jeff Fliegel

Posted
Posted

I have 72,000 on my 2018 , trans is getting rebuilt as we speak ($5500) thanks GM for the warning. Would have changed the fluid to Mobil 1 if you had warned me. 3 GMCs  in my driveway 4th will most likely be a Ford

 

  • 2 weeks later...
JerryP New Member

JerryP

Posted
Posted

My 2017 8L90 6.2 Z71 just passed 132k. I did have a few hiway speed jolts prior to downshifts about 500 miles ago. Into the dealer now for diagnostic. Only 15k miles since fluid and filter change.

  • 5 months later...
SuperOldSchool Enthusiast

SuperOldSchool

Posted
Posted
On 6/5/2023 at 10:51 PM, SuperOldSchool said:

130k on my 2015 8L90.

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


Now at 151k.  Plan to do a fluid suck and fill (no filter) in spring.   Have changed fluid at 45k, 89k, 100k (temp sensor) and 130k.  At the 130k (30k on fluid), magnets were clean and fluid was nice and red, thus just going to do a quick 5-6qt refresh in a few months…

 

I did install the Sure Cool STL010 at 130k, so that should help the fluid’s longevity a bit…wish I had put the thermostat on long ago..

asilverblazer Senior Enthusiast

asilverblazer

Posted
Posted

Data point: 145K on our Yukons. Had the fluid changed at 90K for its poor shifting manners, with little change.

 

It still works, but it is by far the worst GM transmission I've ever experienced. Out of... dozens with all over 100K and many over 200K. Only one rebuild in the mix.

 

I wish this one would fail so that it could be rebuilt, if I were convinced changing mechanical parts would alter its behavior and shift quality.

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