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  1. NickTransmissions

    Transmission hesitation

    The best bet is to have a full diag work-up performed. This starts with pulling up all the DTCs then working them from smallest to largest. Next step is the test drive with live data to verify each condition/drivability symptom by seeing it in the data (examples include excessive shift times...
  2. NickTransmissions

    [SOLVED] 4l60e not shifting into 3rd after fresh rebuild

    Hey, Yea - Fully resolve your T-case codes before doing anything with the transmission.
  3. NickTransmissions

    New trans

    I can certainly do that! will send you a PM a little later today with my contact info so we can explore having you ship me the trans for overhaul.
  4. NickTransmissions

    New trans

    ABSOLUTELY NOT! They cut more corners than anyone Ive ever seen when it comes to building transmissions. $3,700 for a 650hp capable transmission should tell you everything you need to know. My 6L80 Performance Rebuild series, referred to by @SpareParts , covers the build up of a 650 HP...
  5. NickTransmissions

    GM 6L80 Transmission Information Thread

    Mine is similar, except for the summer where it will top out at around 210F in stop and go traffic when temps are 110-120 out. I've noticed no difference at all in it's performance or behaviors between winter (typically runs at 130-160 and now (175-210). This is my 09 Sierra White Diamond...
  6. NickTransmissions

    GM 6L80 Transmission Information Thread

    140-150 is perfectly fine.
  7. NickTransmissions

    New trans

    I have a level 2 build on Youtube that was built for a truck and engine power level identical to yours...Was a supercharged 6.2 Sierra making 650HP. What part of the country are you in?
  8. NickTransmissions

    [SOLVED] 4l60e not shifting into 3rd after fresh rebuild

    That channel occasionally gives ill advise, including reusing teflon sealing rings. So not only does he put you to sleep, you'll wake up angry once you realize what happened when you (or anyone) follows such advice.
  9. NickTransmissions

    [SOLVED] 4l60e not shifting into 3rd after fresh rebuild

    @Brodylyons3 - Transmission Bench will put you to sleep so glad you didn't watch any of his videos; he's a great anesthesiologist so there's that. Yea, let me know when you put the scan tool on it. If you do end up taking it back apart, check out my 4L60E tear down videos as I go through...
  10. NickTransmissions

    [SOLVED] 4l60e not shifting into 3rd after fresh rebuild

    You need to plug in a bi directional scan tool that's capable of rendering live powertrain data to see if you're simply hanging in second gear (solenoid or VB problem) or if it's shifting into third and experiencing a false neutral condition. Once you know for sure which one of those conditions...
  11. NickTransmissions

    Replacement 4L80E hard lines are different from originals

    Agree, it doesn't matter when it comes to flow direction insofar as the cooling system's ability to do its job. I also have customers who use Truecool coolers and they're happy with them.
  12. NickTransmissions

    HD towing package on my 2017 - transmission replaced - does HD part# matter?

    You're welcome, man!
  13. NickTransmissions

    4L60E 4wd odd problem

    Re the thumping - did you check u-joints, transmission mount and/or motor mount condition when it was on the lift? Can't speak to the drive shaft lock up when spinning it counterclockwise so not sure if that's normal or not.
  14. NickTransmissions

    HD towing package on my 2017 - transmission replaced - does HD part# matter?

    No additional check balls beyond the 8 check balls in the valve body starting in 2014+ (that 8th check ball can be retro'ed to any VB back to 2010 w/the third design spacer plate). No additional frictions or steels, either, unless you add them via aftermarket hi-cap kits. The 6L90s had an...
  15. NickTransmissions

    HD towing package on my 2017 - transmission replaced - does HD part# matter?

    Yea def could be...Ive torn down a lot of 6L80s across all years and never seen any (yet) with factory upgrades beyond what enginnering changes to existing parts over the years to address common failures. Occasionally ill see some Sonnax stuff but nothing like the six-speed equivalent to the...
  16. NickTransmissions

    HD towing package on my 2017 - transmission replaced - does HD part# matter?

    AFAIK, the only true HD version of the 6L80 transmission is the 6L90 transmission...Beyond that, the K2 chassis vehicles had a thermal bypass valve (which was anything but an upgrade). If GM put out a HD RPO for the 6L80, the RPO code would be different than the 6L80's RPO which is "MYC" (the...
  17. NickTransmissions

    Doing a transmission fluid change on my 2005 tahoe.

    You shouldn't have a problem as long as both are rated/certified for Dex/Merc or Dex6...You can mix conventional and synthetic as well though most won't.
  18. NickTransmissions

    2005 Yukon XL2500 throwing solenoid error codes

    Check the rest of the external harness and connections w/the TCM and/or ECM, make sure there's voltage and continuity there. Also test the new transmission electrical components, if you haven't already...While it's very rare to see reputable name brands send out DOA parts, it does happen from...
  19. NickTransmissions

    2014 Transmission problems

    Your mechanic is probably right, given the myriad of symptoms - what about him is not trustworthy (i.e. what did he do or say that would make you feel that way)? Do you have a bi-directional scan tool that can render live data and give shift commands to the trans and TC? If not, either invest...
  20. NickTransmissions

    Chevrolet Suburban 3500 Questions

    Those temps are fine...Mine routinely gets to 200 or so in the summer...Drove it today, trans temp topped out at 205...No issues....Your harsh 2-1 downshift could be a myriad of things, including normal behavior to wear in the compensator feed circuit, pump PR valve, latent release of the 2-6...
  21. NickTransmissions

    2005 Yukon XL2500 throwing solenoid error codes

    Yes, you still have a short somewhere in the system and/or one or more of your new solenoids or harness is DOA. Harness brand should be Delphi or Rostra. EPC should be either Borg Warner or Rostra. Shift solenoids, pressure switch manifold, speed sensors, pwm solenoid should all be either AC...
  22. NickTransmissions

    6L80 transmission swap

    @MadMax1 - Assuming you're still viewing the forum, the folks posting above have the re-learn aspect covered (though very late model 6Ls did away w/the fast relearn from my understanding) so if you have something in the 2018-2020 timeframe, you may not need to do the relearn. That said, no...
  23. NickTransmissions

    Chevrolet Suburban 3500 Questions

    Would need to know what transmission @Bigburb3500 has (or year & engine application).
  24. NickTransmissions

    Sluggish Transmission

    I am inclined to agree w/your mechanic relative...Sluggish acceleration at take off and lower speeds but no issues at highway speeds is typically the converter's stator one-way clutch failing to hold thus no engine torque multiplication is occurring. As a result, it feels like the engine has...
  25. NickTransmissions

    Crazy transmissionn temps

    What @swathdiver said; check for restrictions in the system. Perhaps flush the cooler(s) and cooler lines to clear any crud or build up to ensure your system is performing at it's optimal cooling efficency.

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