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  1. Seamus

    2017 Suburban Transmission - Early Death!

    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...
  2. Seamus

    10L80 - filled transmission at wrong temp???

    To prove this theory I may drive my truck up on the lift hot, get it to 212 and i bet a little comes out the plug....and then this will be correct.
  3. Seamus

    10L80 - filled transmission at wrong temp???

    Wouldnt it expand more at a hotter temperature?? Meaning at 167 and dripping out its overfilled-- not underfilled because it needs to fully expand at 212 then let it out plug. When it cools it will be underfilled and not come out the drain plug because its not expanded. It will only come out the...
  4. Seamus

    10L80 - filled transmission at wrong temp???

    I did the same change a few weeks ago and used the check plug not the tube and did it at 167 degrees, maybe a little hotter. But not 212. I have not one issue. I doubt the .75 caused a shudder. How many miles on your truck? The 10 speeds have been very robust compared to 8 speeds that had the...
  5. Seamus

    After a rough Suburban ownership, got a loaded Yukon XL AT4 yesterday

    Exactly!! Jeeze...two totally different generations and trucks. 2015-2020. and 2021-present...and totally different issues known to each generation.
  6. Seamus

    Buying a 2020 Yukon with L83 5.3L EcoTec - Should I worry about AFM Lifter Failure

    Short answer is this generation of LT motor is not as bad as the present generation 2021+. My GM tech says its was never as bad nor that bad on the 2015-2020. Why we are deleting our 2018 and sticking with it. But you are still vulnerable to it. Only 8 lifters instead of 16 on the new one. So...
  7. Seamus

    2023 GMC Yukon AT4 6.2L dead at 10K miles

    Really sorry you going through this. Absolutely insane. Proof that its inevitable in the new generation which has 16 of these lifters. Just a matter of time. I dont know how GM is getting away with this? 4 years!!!!! No recall, no extended warranty, no compensation, ridiculous.
  8. Seamus

    Had to scratch the itch!

    I completely agree having had both. There is no getting used to the CUE system! Touch controls are a pain. The Denali was better and faster to use with dedicated buttons...which was my reason back then for the Denali purchase. Hated the seats though..terrible. We have had several trucks since...
  9. Seamus

    Had to scratch the itch!

    Yeah, I was really surprised it didnt have a brake controller?? My 17' Denali had it! Yet it says right on the sticker trailering equipment!!! So does it take a special Controller?? No biggie as its the wifes truck I have my 3.0 Sierra for the trailer.
  10. Seamus

    Frame and other VIN locations?

    There are many locations on the body and frame. They are in different locations on different makes. They are intentionally hidden. The state Police will inspect for free and have a division that does this.
  11. Seamus

    Had to scratch the itch!

    Congrats!! We just picked up a 2018 ESV and love it. We had Burbs and yukons and Denalis in the past, and have to admit we never considered a Caddy....but honestly its better than out 2017 Yukon Denali we had in the same generation. Enjoy
  12. Seamus

    3.0 Duramax Camshaft Drive Sprocket Replacement

    ^^^ You have 9 2021 3.0's in service???? If so thats a good barometer?? What oil change interval, and issues are you seeing otherwise?? I look at every carfax i can on higher mileage 3.0's nationwide. No engine work on most everything. Oil changes and filters..thats it.
  13. Seamus

    REAR MAIN SEAL leak - dealer in ATLANTA?

    Good luck. I feel your pain. But you have the right direction. If they don't have a diesel tech no way I would drop my truck there.
  14. Seamus

    PF66 oil filter size

    I just changed my oil last night at the garage. I bought 10 oil filters when i first bought the truck for my stash. PF66 AC Delco. A friend bought a used 2020 3.0 and came over a few weeks ago and we changed his oil using one of my filters from 2021. Deal was just get me an AC Delco replacement...
  15. Seamus

    TRANSMISSION OIL CHANGE

    Every 30-50K depending on use.
  16. Seamus

    GDE tune for LM2

    2.5 years left on the warranty....then I am in!
  17. Seamus

    Changing flat tire, lug nut removal?

    ^^^^ LOL I was taken back too!! We just renewed reluctantly! I have waited 3-4 hours for AAA!!! I'd never waste my time waiting unless I was really stuck...anything I can muster will be done avoiding that wait. Mainly keep it for the wife in case i am out of town.
  18. Seamus

    Diesel Cap

    No it does not. I am using it for over 2 years not one issue. I also put green "diesel only" sticker inside my fuel door. I figure I like keeping it clean, but its also a reminder to use diesel. It is cheap insurance. I am driving it 99% of the time but occasionally my wife and I switch trucks...
  19. Seamus

    Lube Locker Rear Differential Gasket

    The rear diff gasket is reusable.....
  20. Seamus

    How much trust do you have in the 3.0?

    Well we are back from our 2800 mile road trip. Truck is even more impressive to me now. At first when we left Florida to NY I was focused on trying to get the great fuel mileage I see many get. ( Florida is 80 mph plus with AC on). I average 22-24 rountinely. Well I had a head wind and driving...
  21. Seamus

    360 camera

    I believe it started in the 2018 Escalade. The Denali did not have it in that generation. Started in 2021 Yukon.
  22. Seamus

    2015 Yukon Denali

    I owned a 2015 and 2017 Yukon Denali XL. The 2015 was horrible Dealer made good on a 2017 at cost to keep me as a customer. I had the 8 speed in both. I loved the 8 speed and it was great for towing and drivability. I had the 6 speed in my 2013 and hated it. Bogged down and always downshifting...
  23. Seamus

    18 LT to 18 Denali

    18-20 gets you the 10 speed in the Denali. BIG upgrade. The 6.2 is not only faster it gets better fuel mileage. Big win, great decision. Yes the L86 can be tuned. There are also guys out there where you can send in your computer and the will delete AFM. Its cheap. Pedal commander will get you...
  24. Seamus

    1st time replacing 10 speed fluid & filter

    Thanks! Did you do the half torque or just a good snug?/ I already did the wifes 2018 escalade and it went really well. But now I am about to do my '21 Sierra. I have the fluid pump and all the filter and fluid...just concerned something is different regarding the bolts?
  25. Seamus

    1st time replacing 10 speed fluid & filter

    Did you use new filter bolts??? Read they are not reusable. One time use torque then specific degree turn. I bought the AC Delco filter--no bolts! So i called my dealer and they had none. He checked other dealers none around. I asked well when a customer comes in today for a trans filter and...

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