Another trans bites the dust

[KONGon22s]

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 May 6, 2021 by KONGon22s

[diyer2]

Regular fluid changes might have prevented this.

[Bash74]

Did you just have the fluid changed the one time at 30k or what. At 101k I already did 4 fluid changes. 

[KONGon22s]

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 May 6, 2021 by KONGon22s

[swathdiver]

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.

[KONGon22s]

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".

[Black02Silverado]

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 May 7, 2021 by Black02Silverado

[Grumpy Bear]

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 May 7, 2021 by Grumpy Bear