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kgkern01

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Everything posted by kgkern01

  1. kgkern01
    Yes it’s 4WD, but putting it into Park does engage the parking lock in the trans, and if the transfer case was in neutral it would still roll. Side hypothetical question, if the 10-speed is that much better of a trans than the 8-speed, can the 10-speed be swapped out, if the worse case scenario happens where I need a whole new trans that is?
  2. kgkern01
    It revs freely as if it were in neutral, even lets it go up to 5k freely.
  3. kgkern01
    The warranty expired Nov 18, 2019 I believe. I took it in for the delayed cold engagement issue the last week it was under warranty, and of course they said they couldn’t reproduce it, even though it happens every time I first started it when cold out in the morning.
  4. kgkern01
    Yeah, the gauge moves between all of the shifter positions correctly, and from what I could see of the shift cable it still appeared to be intact and connected. I was passing someone when it just went out.
  5. kgkern01
    No noises, when I put it in gear it does nothing, sounds exactly like neutral.
  6. kgkern01
    If you’re the transmission guy at a GM dealer, any suggestions or ideas as to what could have happened? I had always gotten a slight whine when I would accelerate hard too, other than the above issue of the delayed cold engagement. I just want to get an idea of what could have gone out and what I’m looking at for a repair? Thanks
  7. kgkern01
    Since there is no dipstick on the 8-speed, and the fill plug is in the oil pan, I just easily check the fluid. However I’ve had zero leaks in this truck, and underneath it has no oil at all, very clean, I’d assume it isn’t a low fluid level. The transmission temp when it went out was not hot either, maybe 190?
  8. kgkern01
    I don’t think a tune or reflash is going to make drive/reverse start working again though, it has to be a physical issue to cause it to go out like that.
  9. kgkern01
    No I didn’t, but I had the dealership do a flush last summer.
  10. kgkern01
    Of course this happened exactly 1 year after the warranty expired. I accelerated and then it just lost forward gear like I had put it in neutral. No forward, reverse, and doesn’t even feel like I’m switching it into Drive or Reverse when it’s running. Before the warranty went out I had taken it in regarding the delayed cold engagement issue, but the dealership said they could reproduce it of course ?. So, any suggestions or ideas what could have happened to just lose all forward and reverse gears in this 8-speed?
  11. kgkern01
    Did you ever find the resolution to your issue? I'm having the same no left turn/brake and no dome lights/chime when door open as well, just had the BCM replaced at the dealership, the issue is still there...
  12. kgkern01
    So the guy that tuned my 6.2, just tuned a bone stock 6.2 on 93 octane, and my truck has just a cold air intake, heavier Ridge Grapplers, and the E85 conversion, and the bone stock after tuning the stock truck made 358rwhp/405 rwtq, mine made 380 rwhp/435 rwtq (on 65% ethanol per the sensor). So a gain of 22rwhp/30rwtq. The extra 30ft/lb of torque is noticeable. Since the tune I have been running E85 exclusively, except for a road trip I went on a couple weeks ago, I ran 93. The lesser torque was noticeable on the 93.
  13. kgkern01
    My tuner said the same, that he doesn’t really mess with Torque Management on these trucks much either.
  14. kgkern01
    True, I’m sure dialing back the torque management in the tune helped quite a bit, but the (estimated) extra 35rwhp/45rwtq from the E85 part of it didn’t hurt lol.
  15. kgkern01
    It was not tuned prior to the E85, but with just a base E85 map loaded, the base pull was only down 10rwhp, 12rwtq vs the final pull. Adjusting AFR and timing further on subsequent pulls didn’t gain anymore than the final numbers. Plus, even the stock 5.3 is factory rated what 30-35 hp/tq more on E85, with .5 less compression, 0.9L smaller displacement, smaller cam. So the gains for the 6.2 converting to E85 are not really surprising.
  16. kgkern01
    So now after driving it around a few days the torque difference alone is worth it to convert in my opinion.
  17. kgkern01
    I actually just bought a GM sensor, Russell female fuel line connectors and put it in line where the tank soft line connects to the hard line, then extended the sensor plug 18”. Only $70 worth of parts and no cutting fuel lines. The 8L90 is rated up to 738ft/lb of torque, which should be around 575 rwtq, so if you’re approaching that with the blower then it may be upgrade build time for the trans?
  18. kgkern01
    My tuner said that the early 8-speeds are tunable, but the later ones you have to send the TCM off For tuning because they are locked. I didn’t dyno it before I did the FlexFuel conversion, but bone stock L86 dyno’s that I’ve found tend to be in the 330hp/365tq range. So the air intake, smoothed throttle body, and E85 tune got roughly 50rwhp/70rwtq. Which I’ve seen others gain 35-40rwhp/40-50rwtq off just Doing the E85 Swap and tune, so 20hp/tq off intake and throttle body is about right.
  19. kgkern01
    Just got my 2015 6.2 Sierra dyno tuned after adding the ethanol sensor, also did 8-speed tuning. Only mods are Volant intake, home ported throttle body, and E85 conversion with dyno tune, also on heavy Nitto Ridge Grapplers. 380rwhp/435rwtq. Pretty happy with the numbers.
  20. kgkern01
    Any update on the HMI 3.0 upgrade? I have a 2015 Denali, and was going to do 2.5 upgrade, but if 3.0 will be an option soon, I'd rather hold out for it. Thanks!
  21. kgkern01
    Following this as well. I was planning on upgrading my 2015 to the 2.5 with ApplePlay, but I may hold off if this is a better option.
  22. kgkern01
    https://appdevelopermagazine.com/gm-releases-ngi-sdk-for-developing-infotainment-in-vehicle-apps/ I just registered as a GM Developer, I am going to try to make an app that will display real-time engine data on the Info screen. I'll post back once I've got something working.
  23. kgkern01
    Thanks! They are 295/55R20 Ridge Grapplers, and 1.5” SuspensionMaxx Magneride level kit. I tow my boat in the summer so didn’t want to go too high in the front, I still have about 1.2” rake front to rear. Tires don’t rub at all except at 100% full lock I get some slight rub on the sway bar but that’s it.
  24. kgkern01
    You would have to ask the dealer to rezero all the shocks, they work together as a system, so you just tell them that you need to reset/zero the Magneride system because you’ve done a lift. There are lift kits that are designed for the Magneride system that will come with the relocation brackets for the sensors to keep them at the same setting. This is what I used for my front level, and I recommend doing the same if you are doing a full lift, just look for a lift kit that is made for the Magneride system and includes new sensor brackets.
  25. kgkern01
    If you alter the height front or rear the shocks either need to be re-zeroed at the dealer, as each shock has a sensor on it that measures the height, ie. shock travel, and adjusts the damping based on where the load.
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