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  1. NickTransmissions

    Transmission interchagability

    Will not interchange if the envoy has one of those inline 5 engines. Input shaft, bell housing and torque converter are completely different. Any 2000-2008 4WD 4L60E that went in behind a Gen3 small block will work. That said, why not rebuild the one in the vehicle now?
  2. NickTransmissions

    2017 Tahoe LT not shifting into drive

    Probably #1 checkball worn/stuck in the spacer plate. Could also be 1-2-3-4 broken piston (not as likely) or rear sprag but those dont fail too often.
  3. NickTransmissions

    Tranny help

    If your rpms climb high enough in manual low, trans will force an upshift to second gear to protect engine and trans from damage. You need to do a gear command mod, which would give you manual low at any speed and rpm. Transgo reprogramming kits have these mods/parts so install that kit for your...
  4. NickTransmissions

    So this just happened...is it bad?

    Nothing inside the transmission would prevent the engine from turning over or make it any harder to do so than normal as the input shaft/456 clutch drum and clutch pack passively rotates around the 456 hub when engine is running, vehicle is in park or neutral. Voltage irregularities can trigger...
  5. NickTransmissions

    6l80 tcc slip tuning stock clutch

    That's impossible to say unless you either take surveys of sufficient sample sizes to draw such conclusions or the data is already out there, plus you'd have to quantify what it means to 'work harder' to ground the results. Bottom line: they are all prone to the same type of failures, most of...
  6. NickTransmissions

    6l80 tcc slip tuning stock clutch

    You're correct, the 90s are about 4-5 inches longer and those that went into diesel-equipped vehicles had an extra clutch and steel in the packs as well as stronger planetary carrier sets and the TMBX converters they came with had flanged hubs whereas the 80s converters did not. It's a stronger...
  7. NickTransmissions

    So this just happened...is it bad?

    P0796 is a solenoid performance code specific to clutch pressure control solenoid 3 (CPC3 stuck 'off') however much of the time your TEHCM isn't to blame (the solenoids are all housed w/in the TEHCM (transmission electronic hydraulic control module) and cannot be replaced individually. That code...
  8. NickTransmissions

    So this just happened...is it bad?

    Depends on what's triggering it. Could be TEHCM, Valve Body or internal case. Any trans-related drivability symptoms?
  9. NickTransmissions

    Service 80k mile 10 speed or leave it alone?

    Most Autel scan tools are capable of fast adapt/relearns. Same with Snap On, Bosch or AC Delco's TDS system. Id invest in a scan tool. Costs a tiny, tiny fraction of what your vehicle costs and will pay for itself many, many times over the course of your vehicle's expected in-service lifetime...
  10. NickTransmissions

    New Torque convertor now ECM Wont Communicate

    Let it run until it's hot enough then put it in gear to further circulate fluid and top off (just don't try to drive it around) then do the fast relearn. Once the fast relearn executes, take on a short test drive, check fluid after about 500-1000 feet of driving, top off as needed. That's how...
  11. NickTransmissions

    2017 Tahoe 6 speed - question about trans thermostat?

    Flip the pill or install the Superior Tech delete kit as shown in the video above and put on the largest cooler you can fit onto the truck. Route lines through the internal trans cooler and the aftermarket cooler.
  12. NickTransmissions

    New Torque convertor now ECM Wont Communicate

    Vehicle has to be running, transmission to operating temperature prior to beginning the fast adapt relearn procedure for the transmission. Do you have a 'No crank - no start' or is it cranking over but simply not firing up?
  13. NickTransmissions

    New Torque convertor now ECM Wont Communicate

    No, you'll need to fix the comm problem first but not having a capable scan tool handicaps you bigly. I strongly recommend you invest in one so you dont have to rely on other people (shops, etc) to do basic diag and reset functions. Autel, Snap on, Bosch, etc all make them. AC Delco's Technical...
  14. NickTransmissions

    New Torque convertor now ECM Wont Communicate

    You have to do a fast adapt relearn anytime you do anything to the transmission beyond just a fluid and filter change. This includes the torque converter since the computer will adapt to TC degradation that shows up as drivability symptoms and/or anomalous data readings to the PCM. So you will...
  15. NickTransmissions

    New Torque convertor now ECM Wont Communicate

    Rgr...Have you attempted to reestablish communication and re-set the adapts to factory new using your scan tool?
  16. NickTransmissions

    New Torque convertor now ECM Wont Communicate

    Idea #1 - change your thread title, put something that indicates your specific problem Idea #2 - Perform a Fast adapt relearn - must be done before you attempt to drive it. Idea #3 - Read through my thread on these transmissions, you may find your answers, including your IMS concern, there...
  17. NickTransmissions

    6L80 Sonnax ZIP Kit, Pressure Switch rebuild, remote filter install, and fluid flush in 2013 Escalade ESV (Pic heavy)

    In case you haven't seen it yet: https://www.tahoeyukonforum.com/threads/gm-6l80-transmission-information-thread.141927/ Post any 6L related questions in that thread or start a new one. I and others will respond...
  18. NickTransmissions

    GM 6L80 Transmission Information Thread

    It's up to you on the billet converter cover; I typically only do them on HP or HD builds but sometimes the customer wants one, regardless.
  19. NickTransmissions

    GM 6L80 Transmission Information Thread

    These folks? https://austextransmission.com/transmission $2800 is for a complete overhaul, torque converter plus $1200 r/r so 4$k...not bad if so..
  20. NickTransmissions

    GM 6L80 Transmission Information Thread

    The price sounds about right though I'd want to confirm you're getting a new TEHCM from GM in that price. Otherwise, it may be a bit high. The warranty isn't too bad at all for an independent shop...You have to remember, General Motors is a multi-billion dollar company, the source company for...
  21. NickTransmissions

    2004 Yukon - Rumbling at ~50mph - Please help!!

    You're very welcome, @CO3_Yukon - glad it's back on the road!
  22. NickTransmissions

    2017 Tahoe Trans rebuild advice?

    You said very few, which implies a tiny percentage of shops to any reasonable person, including me. And you never mentioned anything about how to get to 800 RWHP, you just made a blanket statement about folks' vehicles on her which I can refute, AS STATED. Not sure what you don't understand but...
  23. NickTransmissions

    2017 Tahoe Trans rebuild advice?

    You must have had some bad experiences in the past with an independent shop; if so, I understand - I have too, which is why I taught myself how to rebuild transmissions. There's plenty of shady shops but also much more who are competent, knowledgable and honest. If you have had no such first...
  24. NickTransmissions

    2007 6l80 on a 2008 Denali

    They're not VIN-locked but there are different variations of the operating system for transmission control loaded onto different models/sub-models. Pop the pans off of your existing trans and this new one and compared the TEHCM part numbers (they are visible on the face of the TEHCM as soon as...
  25. NickTransmissions

    2017 Tahoe 6L80 Transmission Issue

    Yea, check it when hot so you have an accurate reading on where the level is at relative to where it needs to be...Hopefully that's it...If you're full-hot and still no movement, do a line pressure test to confirm/deny the pump is making pressure. The line pressure port plug is located on the...

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