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  1. SuperOldSchool

    2017 Tahoe Low Milage Maintenance Recommendations

    You’re on the severe schedule - short trips. Change: Both diffs oil Transfer case Trans fluid Brake system flush I’d do coolant too - that’s just me/ my thought Grease zerks on front suspension- only 2 Run a dose of Techron thru tank before oil change
  2. SuperOldSchool

    Changed my filter and fluid on 8l90 8 speed today

    It runs about 50-60 degrees cooler than it used to.
  3. SuperOldSchool

    '21 Tahoe Z71 Transmission Failure

    Is it now fixed!?
  4. SuperOldSchool

    2015 Yukon Denali - Cleaned throttle body today

    Glad you saw results. I didn’t at all.
  5. SuperOldSchool

    Changed my filter and fluid on 8l90 8 speed today

    Yes, reuse it.
  6. SuperOldSchool

    2015 Yukon Denali - Cleaned throttle body today

    Throttle body cleaner. Avoid getting it into the pivot pins of butterfly. Move the butterfly very slowly and gently . Have fun!
  7. SuperOldSchool

    2015 Yukon Denali - Cleaned throttle body today

    Hello all, Sharing some pics of cleaning my throttle body at 140k. I have never cleaned it before(on this truck) and was a bit apprehensive after reading so many say they had issues after doing so - high idle/ unable to get it to relearn…..I had no issues. I bought a new TB gasket, and went...
  8. SuperOldSchool

    2015 Yukon Denali replacement brake parts recommendations

    Another vote for PowerStop Z36 kit. Have them on my 2015 and they are great. OEM kept warping for me. These have not.
  9. SuperOldSchool

    2015 Yukon SLT - Sunroof No Power

    I had this same nonsense going on. I noticed some burnt residue by the sunroof switch too. I ordered a new switch. Number 8 fuse on driver side still blowing out. It would work until I opened the console. I popped the console lid inner cover off and also removed the console rear panel...
  10. SuperOldSchool

    Most miles with stock AFM system?

    2015 Yukon Denali stock @ 138k miles. Had a lifter replaced at 72k.
  11. SuperOldSchool

    Don’t forget to flush your brake system - 3yrs or 45k

    I tow and I do brake aggressively, so brakes running hot.
  12. SuperOldSchool

    Don’t forget to flush your brake system - 3yrs or 45k

    DOT 3. I may use 4 next time and see if that stays cleaner longer
  13. SuperOldSchool

    Don’t forget to flush your brake system - 3yrs or 45k

    OP again. Just flushed at all four wheels today. It gets so dirty so fast…. 130k (30k interval) and about 1.5 years since last service.
  14. SuperOldSchool

    Changed my filter and fluid on 8l90 8 speed today

    OP again. Changed again today (fluid and filter) at 130k…. 31k on the fluid. It was still pretty red and not much paste on the magnets. Also, added the SureCool thermostat to lower trans temps. Good stuff!
  15. SuperOldSchool

    Put a new transmission in my 2004 Yukon…

    Redneck engineering at its best! ‘Merica
  16. SuperOldSchool

    Put a new transmission in my 2004 Yukon…

    Really nice job! Love seeing folks take big projects on with success!
  17. SuperOldSchool

    I made it! 2015 Yukon XL Denali, , 300,000 miles

    Hey tuffguy, at what mileage did you swap out the trans thermostat for the colder one? I was contemplating this, but not sure worth it at 120k miles. Thanks
  18. SuperOldSchool

    I made it! 2015 Yukon XL Denali, , 300,000 miles

    How many miles on trans when you put the cooler thermostat on it? I forgot I had the radiator/ heat cycling crack issue as well. I’d like to keep it to 200k-250k, but not sure I want all those repairs to continue. I’m sure I’ll need another set of shocks, prob some wheel hubs, control arms...
  19. SuperOldSchool

    I made it! 2015 Yukon XL Denali, , 300,000 miles

    Awesome! I am at 120k on my 2015 Denali. Lifter replaced about 75k, new trans at 15k, couple fuel pumps, MRC shocks, 2 gps antennae, condensor, trans temp sensor and some other stuff all under warranty. I’ve replaced trans fluid every 45k Diffs and Transfer case oil 2x Plugs and wires at...
  20. SuperOldSchool

    2016 Yukon hesitation on acceleration - no codes

    Yeah I get it. It’s frustrating. I did wires and plugs at 76k. They looked good - posted pics in this site. It seemed to run more smoothly after that, but could be placebo effect.
  21. SuperOldSchool

    2016 Yukon hesitation on acceleration - no codes

    But you said it hesitates when revviing in Park too - is that trans related? On my 2015, if I goose it in park, it kinda stalls for a quick fraction of a second. Almost like it’s getting not enough fuel. It’s always done that as far as I know. May due to the idle being set to low?
  22. SuperOldSchool

    2016 Yukon XL Needs New Transmission - Not Happy

    Fuel pump was covered, injector failed after the lifter repair- so they acknowledged that and fixed it as good will.. they caused it.
  23. SuperOldSchool

    Removing transmission pan

    I have done my 2015 Yukon (8l90) twice and did not have to move or remove anything. If you turn the front of the unbolted pan (front is front of car)toward the passenger side, it slides out without issue.
  24. SuperOldSchool

    Updated Thermal Control Valve

    Maybe, but after 100k miles and 7 years I would think they are a lil deformed.
  25. SuperOldSchool

    Service Brake Assist Message

    I was mistaken, that was for another error message I had - they replaced 3/4 sensors that time. For the one you have, they put in a new neg battery cable for me. I was getting constant service brake system lights ans others . The pedal felt funny and would pulse a little. Invoice below …

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