Jump to content

Another trans bites the dust

KONGon22s

By KONGon22s
in Engines & Drivetrain

 Share

Recommended Posts

KONGon22s Enthusiast

KONGon22s

Posted
Posted (edited)

First post, been a lurker for 3 yrs...2017 High Country w/ 101K. Lost 6,7,8, gears and truck wont shift past 5th at all. Similar symptoms to others, hard hesitation then super high RPMs (low gear limp mode).

 

Dealer inspects and says fluid is so gummed up the valve body, solenoids and some other sh*t is "stuck" and there is metal everywhere. Yep, had the torque converter issue at 30K, with dealer flush. $5K for a new trans with a better warranty than the stock, 3yr/100K...wtf. Apparently any "updates" GM has made will be in this shiny turd of a sh*t show.

 

Anyway...after this disaster, I'm in prevention mode...new fluid after the first 10K, then every 20k (trans, diffs, transfer). Oil every 5k, this 8L90 sucks azz.

Edited by KONGon22s
diyer2 Senior Enthusiast

diyer2

Posted
Posted

Regular fluid changes might have prevented this.

  • Like 1
KONGon22s Enthusiast

KONGon22s

Posted
  • Author
Posted (edited)

One change...Asked the dealer (at 90K) what's needed at 100K...showed me the service schedule and said at 90-100 change everything.

 

But at 60K (on the fluid) that gums it up...that's crazy.

Edited by KONGon22s
  • Like 1
  • Confused 1
swathdiver Senior Enthusiast

swathdiver

Posted
Posted
2 hours ago, KONGon22s said:

One change...Asked the dealer (at 90K) what's needed at 100K...showed me the service schedule and said at 90-100 change everything.

 

But at 60K (on the fluid) that gums it up...that's crazy.

 

What's crazy is that you bought that truck and didn't read the owner's manual for a couple of years.

  • Like 1
KONGon22s Enthusiast

KONGon22s

Posted
  • Author
Posted
1 hour ago, swathdiver said:

 

What's crazy is that you bought that truck and didn't read the owner's manual for a couple of years.

No one to blame but myself, I get that. If it was advanced wear, degraded performance, even abuse, sure that would make sense....Failure from normal conditions is absurd to me, not to mention all the other 8L90 issues for folks that follow the manual to a "T". 👿

  • Like 1
Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted (edited)

Transmissions are out of  site out of mind for a majority of individuals.  Years of old, miles didn't get put on like today so there never was issues with the transmissions.  Now fast forward to current time and the transmission is way more complicated than in past.  Thus why GM went to a thinner fluid dexron VI and HP and so on.

 

Keeping the fluid fresh with the regular AC Delco dexron VI every 30k is a good rule of thumb.

 

Use a quality full synthetic and you can extend it to 50k miles or longer with a UOA.

Edited by Black02Silverado
  • Like 2
Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted (edited)

This is an argument I have with the Mrs. allot. You can't drive and maintain like you THINK it should be able to handle. You have to treat it like an idiot designed it and a moron maintains it and not be the dip switch that drives it into the ground. Harsh? Perhaps. But the world we live in. 

 

Keep it cool, Keep it changed. Keep it filtered. Keep it's operation moderate. 

Edited by Grumpy Bear
  • Like 2
  • Thanks 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • dieselfan1
      Tire pressure for 37s

      By dieselfan1 · Posted

      2026 3500HD.  Mostly empty. Grocery getter. What tire pressure are you running for 37x12.50x20. I have 37x12.50R20 Toyo Open  Country RT pro and been running around 55 lbs front and rear and it's too much. Tires are wearing more in the middle. Toyo says 45 front and 50 rear. Chalk test and it's still too much. I lowered it to 40 front 44 rear see what happens. 
    • Coastie05
      Casey from the Texas Hill Country

      By Coastie05 · Posted

      Enjoy the new truck, it’s a beauty. I’m glad you’re keeping the OBS, I love those old trucks. 
    • chris21
      Towing In Loose Gravel

      By chris21 · Posted

      With large equipment or deep mud it is more of a use the higher gear to avoid spinning tires, getting stuck because of spinning tires and doing damage to your machine. The idea is if you run out of torque before you spin tires you can still downshift for more torque. If you are just spinning your tires in the lowest available gear you are stuck and things break.   Automatic transmissions, traction control and electronic transfer cases change the calculation a little as you the driver have less control over each piece. 
    • davester
      My First Project and GMC has me stumped

      By davester · Posted

      are there any codes? with lots of rust, perhaps disconnect/clean both sides of the connection/examine cable ends (the wires) for corrosion going into the sheath & replace if necessary/reconnect ALL the power AND ground cables between the battery, engine, frame, cab, fuse box and starter charm.li (website) has a no-start diagnostic procedure you can work through to get it working.
    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      Its no wonder you've gravitated to the oil types and brands you have in later years after trying certain brands and one being a specialty oil or at least very hard to come by up here and the other would have been a commonly found oil of the era and the vastly different outcomes as a result to using the vehicles in question the same distance for an OCI . It shows what marketing hype can do without actually having the product to back up the claims and that is no different now with the insane claims that are written on the side of a bottle of oil from some of the off the shelf oils.    What has surprised me and I was already finding this out before I bought my truck with the GDI engine, that this newer fancy technology that seemingly would suggest better fuel economy/emissions with this high pressure spray of fuel is not in reality kind at all to the engine or at least the oils life. Yet they insist on claiming long OCI with this technology just like they did with the port or similar type fuel injection systems when in reality its a step back in oil life to have a GDI system.    I think the mistake your making Grumpy is that your not sending your samples to Blackstone and getting the feel good glowing report that you can run it another 1000 or more miles and then send another sample where they say run it yet another 1000 miles and on and on it goes until your sending in something that looks a lot like road tar and then they may suggest you change your oil within the next 1000 miles 😆

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...