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  1. RobH

    6.6 Gas L8T Engine Swap in 2015 Suburban

    This may have already been covered. @L8T BURB's investment is his new 2021 transmission and V8. We all know that he has much more than a rebuilt 2015 V8 and 6L80E. But, that was his cost. So, selling it as a 2015 Suburban with new engine/transmission replacement in 2023 should get back his...
  2. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    My experience with fancier cars is that fixing the fancier systems is expensive. We bought a 2006 Mercury Gran Marquis LS with the Handling and Performance Package equivalent to the Crown Vic police package. Nice car. The throttle body position sensor failed a couple of thousand miles out of...
  3. RobH

    2017 Escalade/Denali L86 "requires" 93 octane - your experience?

    The 2017 Denali and Escalade Owners Manuals say "Fuel (L86 6.2L V8 Engine). Use premium 93 octane unleaded gasoline in your vehicle. Unleaded gasoline with an octane rating as low as 87 may be used, but it will reduce performance and fuel economy." I know that the engine computer can enrichen...
  4. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    I believe that it is 4WD. I'll know this afternoon after I take the VIN to my nearest GM parts counter and get a printout of of all the equipment and options. Thanks everyone for your info.
  5. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    For the 2017 Escalade knowledgeable, she reports it's a Platinum, but didn't bring it to church this morning. So, I haven't seen if it has an integrated trailer brake controller or heavy duty integrated receiver hitch. Pro's: it has a 6.2 liter engine, 100K less mileage and an eight speed...
  6. RobH

    Most miles with stock AFM system?

    I've changed lifters before without pulling the heads. Removed the rocker covers, removed the rocker arms, pulled the pushrods, and pulled the lifters. That was before roller hydraulic lifters and the LS/LT engines, though. Removed the cam out through the front of the engine compartment after...
  7. RobH

    Intro - First Offical Post (Recent replaced 98 Yukon with a 17)

    You may have caught me in the midst of correcting my error. Thank you. The correct code for the 6L80E is MYC. MYC, darn it. My fingers like to mis-type the characters. :) MYC like on my SPID picture above. ^^^
  8. RobH

    Intro - First Offical Post (Recent replaced 98 Yukon with a 17)

    Further to my last, there should be a SERVICE PARTS IDENTIFICATION (SPID) sticker on your glove box door. It lists the three character codes for Factory installed equipment. The code for the 6L80E transmission is MYC. 6 speeds L Longitudinal/RWD orientation 80 - power handling rating E -...
  9. RobH

    Most miles with stock AFM system?

    2016 Tahoe 5.3L. 135,000 miles. Stock AFM. I have started driving with the transmission in M5. Plan to get a tune. Really don't want to have to get the engine repaired on a road trip. I can also get the transmission pressures adjusted to help my reman transmission live. Does a person have...
  10. RobH

    What weight oil do you use in the South?

    How much total mileage do you have now? What year and engine do you have? It would help if you put that info in your signature. Thank you.
  11. RobH

    Changed my filter and fluid on 8l90 8 speed today

    Did you install a drain plug in your pan? I've used drain plugs from Summit in the past.
  12. RobH

    2017 Escalade versus 2016 Tahoe for Towing

    My 2016 Tahoe LT has the NHT Max Towing Package and 135K miles with a GM re-manufactured 6L80E a year ago at 125K miles. Two years and 90,000 miles to go on the factory warranty. In south Texas, snow is not an issue. I like that it is 2WD with the locking differential instead of 4WD. I put...
  13. RobH

    Intro - First Offical Post (Recent replaced 98 Yukon with a 17)

    The original issue transmission thermal bypass valve (thermostat) for the MYC (6l80E) and MYD (6L90E) transmissions maintains the transmission fluid at around 185F. The Service Bulletin No.: 21-NA-199 (search online for the current version) calls for installing a 70C/158F Thermal Bypass Valve...
  14. RobH

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

    Ok. I give. :) AFM is Active Fuel Management. Collapse lifters for four cylinders and shut off fuel to those cylinders under low load conditions. DOD is Displacement On Demand. Same as AFM. Collapse lifters for four cylinders and shut off fuel to those cylinders under low load conditions...
  15. RobH

    Towing a trailer with automatic leveling system

    I do the same. Hitch and adjust with the ignition off. Your manual should have instructions for hitching with a weight distribution hitch. My 2016 manual says to adjust the weight distribution system to make the front fender opening height the same as when unhitched. This keeps an...
  16. RobH

    Safely long-haul towing with a 2006 Z71 Tahoe

    My transmission went south on me during a trip from Texas to Florida to Pennsylvania and back to Texas in April. It became very apparent in South Carolina. I got a fluid flush which helped for a little while. I changed to driving at 2000 RPM at about 60 MPH on the interstates and nursed it...
  17. RobH

    My Experience Towing with a '17 Suburban 5.3L

    I would speculate that your weights that are labeled on the weight ticket as Steer Axle -- 7780 lbs Drive Axle -- 6080 lbs Trailer Gross -- 13,860 are actually Surburban -- 7780 lbs with both Suburban axles on the front pad Trailer -- 6080 lbs with the trailer axles on the second pad where...
  18. RobH

    2016 Yukon/L680 Transmission upgrades for HD TOW 2016 Yukon XL

    With a "tune", you can disable the AFM electronically in the Engine Control Module/computer (ECM). Basically, the ECM reads a parameter/settings file when the ignition is turned on. The file tells the ECM how to manage the engine. A tuner program reads the ECM settings file, edits it, and...
  19. RobH

    2016 Yukon/L680 Transmission upgrades for HD TOW 2016 Yukon XL

    Welcome to the Forum. Does your Yukon have the "NHT" option code for the Max Trailering Package and "GU6" for the 3.42 rear axle ratio on the sticker in the glove box? Without NHT and GU6, the maximum combined vehicle and trailer weight is 2000 pounds less. It's in the fine print in the...
  20. RobH

    Cloud feeling Suspension?

    BG1988 said, "the smallest rims on a NNBS tahoe is 17" that means you would need 265/70/17 to be equal size to the 18" 265-65-18 i don't think 15" tires fit on a 17" rim." You are correct on the tire sizes. I edited my earlier post. I must have been really tired when I made that post...
  21. RobH

    214K 6L80 rebuild before TCC failure

    With my 1995 OBDI Caprice 4L60E, I did something like this using the TunerCat software. I was a lot happier with the results in transmission behavior. And I believed that I was helping longevity of the transmission and engine by reducing transmission up and down shifting and engine lugging. I...
  22. RobH

    Cloud feeling Suspension?

    What is an XFe? In general, lowered suspensions have less suspension travel. So unevenness in the road is transmitted more abruptly to your backbone. Starting around 1970 off-road motorcycles and racing trucks and sedans started converting to longer travel suspensions and shocks to keep tires...
  23. RobH

    Transmission replacement costs?

    If you ensure you have the lower 70 Degree Centigrade Thermal Bypass Valve (transmission thermostat), you may be able to significantly delay the inevitable.
  24. RobH

    Slipping or stuttering in 4wd auto mode -- is this normal?

    When my tranny torque converter lockup clutch started going out, it was slipping and grabbing in some gears, primarily second. No codes. Did a full fluid flush. Eventually there were codes and a reman transmission. I'd really watch it closely your next miles until you exit your warranty...
  25. RobH

    Post what y'all tow with your Tahoes, Yukons, and Suburbans!

    2016 Tahoe and 17 foot Casita which weighs 3200-3300 pounds ready to go. I'm widowed so don't load up the Tahoe with family and gear. My 2 Meter Yaesu and mag mount antenna. My Icom 7300 and a couple of wire antennas. The Casita has trailer brakes. It tows great. I try to back off on the...

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