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  1. M

    214K 6L80 rebuild before TCC failure

    I bought my converter from transtar which supplies many of the local transmission shops, but their retail price is higher than Summit. Mid $300 is still pretty good for the billet cover and flanged hub upgrades. It will be interesting to see if the 2020+ 2500 stock GM converters are a good...
  2. M

    2021 PPV Front Brakes on 2013 Escalade ESV, and rear brake overhaul

    It is great to see that the Powerstop 2021-2023 PPV rotors are available! I had the same problem with wheel clearance for my 2011 Yukon Denali wheels, so I ended up using .250 hub centric spacers from Baer. I don't like having the wheel non-hub centric, but the braking is awesome.
  3. M

    2012 Yukn Denali -Tranmission died, 172,000 miles, what to do

    A GM replacement is a decent option, and will likely get you another 150K miles with good maintenance. And you get a reasonable warranty. $800 for the removal/install is a good price, as is the $4500 for the trans. Your only other good option is to take it to a trans specialist that will be...
  4. M

    Parking pawl replacement 6l80e

    The updated rod is GM 24280048 for the 6L80, and it is backwards compatible. The 6L90 rod is longer. The Sonnax 6L45-6L90-ZIP kit has upgrades for the valve body, and they are pretty easy. However, the critical upgrades from the kit are probably in the pump cover, so you can't do those...
  5. M

    Catch can flow discussion

    I bought the JLT and the install seemed backwards to me so I checked the instructions for any indication of inlet filter. So in the end I switched the sides so the filter was on the intake side. JLT is likely correct that the best filter placement is on the valve cover side. However, even...
  6. M

    Public Service Message - AFTERMARKT O2 sensors SUCK!

    Denso manufactures the GM O2 sensors for your 2007 Yukon. I have used Denso 02 Sensors on many vehicles including my 2011 Yukon, without issue. I don't know anything about Walker sensors, but replacing all 4 sensors with the cheapest available without even doing any analysis of the OEM sensor...
  7. M

    HELP! 2012 suburban 6L80 trans failure

    I would say yes, it is an option. The 6L80 is pretty straightforward, and parts are readily available for a reasonable price given the mass quantity of transmissions on the road. The main requirements are a good transmissions jack, large snap ring pliers ($75), pump centering tool ($150), the...
  8. M

    HELP! 2012 suburban 6L80 trans failure

    Based on Nick's analysis, I would say yes it is worth it to rebuild the 6L80. Aside from the torque converter slip problems (which is more software than mechanical), the most likely mechanical design flaw is the undersized 4-5-6 clutch. So if 4-5-6 is gone and 3-5-R is not far behind, you...
  9. M

    Diagnostic and Programming tool research - anyone use the Mongoose cable from drewtech / opusvis?

    No, all the aftermarket diag tools from the aftermarket, are essentially 'copying' the implementation of the factory diag, which mainly only interact with the computers in the car to alter 'features' which the car computer is willing to change. Most of the accepted changes are only temporary...
  10. M

    Diagnostic and Programming tool research - anyone use the Mongoose cable from drewtech / opusvis?

    Autel is certainly VERY confusing in terms of model selection, and their naming conventions are horrid. The short answer is all of the bidirectional scanners that say 28+ or higher functions provide essentially the same coverage for a 6+ year old vehicle. For some of the latest features in the...
  11. M

    Engine additive: ATS chemical.

    I used the ATS 505 on my son's 2012 TSX which was consuming oil at a quart every 1K miles at only 80K miles on the engine, with fresh Mobil1. Honda supposedly improved the oil ring tension in 2011, but the manual transmission cars still have issues. I think the recommendation was 30 minutes...
  12. M

    Installing "2021 PPV" style 6-Piston Brembo Front Brakes on a 2007 Yukon Denali

    Thanks for the heads up on the brake line stretch, I didn't think to check that. My 2011 Yukon Denali factory 20" seven spokes (similar to those esky wheels) had at least 1/16" clearance on the test fit. Unfortunately, I didn't account for spacing the caliper to center on the rotor, which of...
  13. M

    214K 6L80 rebuild before TCC failure

    The only real downside to locking in the lower gears is wear on the TCC. Driveability is possibly an issue, because if you are locking ******* the upper gears, it could be more abrupt in the lower gears. Yes, negative slip is engine braking. The only effective way to get a solid lock on...
  14. M

    214K 6L80 rebuild before TCC failure

    Apply ramp is a pressure adder, meaning that it will add the number to the desired TCC pressure. Making changes to the right of '0' slip increases the pressure to the clutch when the TCC has more slip than desired, which should reduce the slip. With HPtuners you can change the units that you...
  15. M

    GM 6L80 Transmission Information Thread

    Thanks Nick!! some much needed 6L80/6L90 content for the channel.
  16. M

    214K 6L80 rebuild before TCC failure

    In hindsight, that is probably the understatement of the year. I was thinking all the mechanical improvement, regulation, better pressure, tight tolerances, stronger/straighter friction surfaces would help the computer to compensate less. Because the computer guesses (I mean characterizes...
  17. M

    214K 6L80 rebuild before TCC failure

    Yes, I would say that replacing the converter may not be enough. It does seem that some are honest enough to admit some shudder comeback problems even with new converters (and valve upgrades). Is it poor quality converter clutch material, poor resurfacing, or just reusing bad converter cores...
  18. M

    214K 6L80 rebuild before TCC failure

    Just to reiterate what Nick is saying in layman's terms is that the aftermarket (mainly Sonnax and Transgo) are providing alternates to the common problems both from wear and performance, based largely on common failures seen in the field. I was fortunate to not see any valve wear, but all the...
  19. M

    Oil Filter Efficiency for Cleaner Oil

    Filter media is a science unto itself. Only 100% efficiency first pass means no large particles go through and no ordinary filter can achieve that. The balance is a combination of filter capacity, flow and efficiency. If you are shooting for high capacity and low restriction you may likely...
  20. M

    Oil Filter Efficiency for Cleaner Oil

    To address the multi-pass efficiency of the test: The way the test works, particles are injected at different sizes roughly by weight, such that the smaller particles are represented at an exponential distribution for the smaller sizes. The particles are injected at a steady rate and the test...
  21. M

    Oil Filter Efficiency for Cleaner Oil

    The top Fram filter is definitely a good choice. Supposedly ?? the Ultimate (today) is basically the equivalent of the 'Ultra' used in this test. An important thing to note is that higher efficiency doesn't necessarily mean long lasting oil filter. As shown in the graph here, the Fram Ultra...
  22. M

    2012 Yukon Denali - 6.2 lifter or something else? [Advice/How to Proceed]

    Agree with Dave. If the cam is fine, replacing the AFM lifters should get you about the same lifetime. The advantage being that you have the option to enable/disable AFM. Technically, I think the VLOM does age, particularly the solenoids and the gaskets, so you will probably not get double...
  23. M

    Oil Filter Efficiency for Cleaner Oil

    Another comparison test with Ultra vs K&N vs Mobil1, using real world (heavily) used oil.
  24. M

    Dreaded Lifter Issue

    If you must drive some type of SUV, the Pilot or Highlander are definitely more economical choices. For $30K, you can get approximately: New sedan with good mpg and warranty 2019 Pilot/Highlander with 60K miles and leather 2015/16 Tahoe LS/LT with 80-100K miles. The first two have high odds of...
  25. M

    Dreaded Lifter Issue

    If you would replace it with another similar large SUV, live in a relatively salt free area, the vehicle has been reguarly serviced, and everything else is in good condition (cracked dash is an annoyance and lock actuators can be replaced), then I would strongly consider at least paying to have...

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