Just posting here as a resource for others. Disappointing news this week regarding my 2017 Suburban. Transmission is needing complete replacement at only 126K. I first noticed when shifting was hard in the lower gears. Then, the most noticeable issue was a whining noise and slipping around 5th-6th gear. I took it into local dealership (trustworthy) and it was toast. Price on new one is $6,500 including parts and labor. This new one will have 3 yr /100K warranty. I definitely didn't anticipate transmission issues with so few miles (for a burb). Real bummer, not a fan!
2017 Suburban Transmission - Early Death!
- Thread starter TechRev
- Start date
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not excatly early, the 6l80's are well known to start having issue's around 120k torque converter goes out, it is the weak spot when it goes it takes the pump with it and the bellhousing, check balls shrink, clutches wear out, some parts develop cracks. find a good shop and have it rebuilt properly with all the known fixes.
changing the fluid and filter can certainly help, the 100k rating that gm gives is a farce at best, nearly every single used one we looked at recently had dirty brown burnt fluid. I always recomend annual fluid change and no more than 40k intervals
Couldn't agree with you more. I change the atf every year on my truck (16 ram 2500) and this 15 suburban we just got will get the same treatment. I also deleted the thermostat since in my opinion 195 is a little high for a transmission even with changing the fluid every year.
Seamus
Full Access Member
It probably started with the torque converter. The 6 and 8 speed should have the TC done as preventice maintenance if you ask me. Because its a guarantee that its going. Recently saw a few 10 speed Tc issues but nothing compared to 6 and 8 speeds. But if not caught it takes out the trans. I do 30-40K trans fluid and filter changes and have never had an issue. My brother does 50-60 and has to do a trans at 135K on his suburban??? Not scientific, but enough reason to bust my brothers chops about it!
Marky Dissod
Full Access Member
How often did you change your ATF & ATF filter?
GM's recommendations are not often enough.
your 12 does not have one, in 2015 and later they added one (external) attached to the body of the transmission & cooler lines
Sucks, sorry to hear but the 6Ls crapping the bed at that mileage is not umcommon. 3-5-R clutch drum leakage and subsequent clutch burn-up is the likely culprit, as usual.
