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  1. NickTransmissions

    3-4 harsh shift 4l80e

    Copy paste of my response to your post on gmt400: Check for codes, issues with other sensors like the throttle pos sensor, MAF or equivalent and clear the adapts as a first step. If that still makes no difference, drop the pan and remove the valve body. Unbolt the accumulator housing and see if...
  2. NickTransmissions

    Turbo 350 issues

    Do you have an aftermarket deep pan and/or large aftermarket trans cooler installed that would dramatically increase capacity over stock? What size (diameter) converter do you have and what is your particular transmission system's total capacity, to the best of your knowledge?
  3. NickTransmissions

    Turbo 350 issues

    Well.....found the problem. Here's a capacities chart https://atiracing.com/tech/index.html You have like 3-4 quarts too much in there, lol.
  4. NickTransmissions

    Turbo 350 issues

    You're welcome - See my response above: If your pressure relief/vent circuit in the pump and/or case is blocked by debris or anything, trans will have to come out, pump removed to clear it. This assumes internal fluid pressure is forcing its way up the tube and pushing the dipstick out. Is...
  5. NickTransmissions

    Turbo 350 issues

    It's literally impossible to blow out the pan, pan gasket, front seal, stator sealing rings etc with shop air (id love to see pics if you manage to do so)..You'll just push whatever is clogging that vent (if anything) deeper into the pressure relief circuit inside the pump, potentially creating...
  6. NickTransmissions

    Th350 shake from 2nd to 3rd

    There isnt too many things transmission-related that can cause your symptoms and even less when the pattern as described (symptom presents when vehicle/trans is cold and goes away when at op temp). Check your flexplate for cracks or loose TC bolts just in case though dont think thats the...
  7. NickTransmissions

    Th350 shake from 2nd to 3rd

    How long has this been happening? Any recent work done on the trans? Sounds like it could be torque converter (stator intermittent failure) and/or tc drainback...anything else, I would think it would happen cold or hot...
  8. NickTransmissions

    What is the best th350 rebuild kit?

    Check out my TH350 info thread for details...gist is BW or Raybestos clutches, steel module, all new bushings, new intermediate sprag, Sonnax HD intermediate outer sprag race, 4L60e center support w/BW low roller clutch, 97+ 4L60E low reverse tubular steels, Sonnax boost valve and spring kit...
  9. NickTransmissions

    TH400 Information Thread

    Thanks a bunch, Matt! I updated the OP with some of the above (the rest will go onto the Fast Facts doc)...I also recommend Sonnax case savers for the intermediate clutch pack in HP/Race applications to further protect those int clutch lugs in TH400s and 4L80Es. Went into the drawers and...
  10. NickTransmissions

    TH400 Information Thread

    Interesting but you might start a separate thread on it to get some substantive replies as I'd like to keep this one focused on the TH400s.
  11. NickTransmissions

    Turbo 350 (TH350) Information Thread

    You're welcome, @Fat 454 !
  12. NickTransmissions

    TH400 Information Thread

    Hi All, Since many of us own at least one GM Squarebody truck with a TH400, I figured I'd start another all-encompassing thread, this time on the Turbo Hydra Matic 400 aka THM400...I have basic facts, links and general information along with videos covering tear down and inspection, step by...
  13. NickTransmissions

    TH-400 Engagement Delay?

    If the modulator's age/mileage/condition is not known, I'd just replace it as they are super cheap...Pull the existing modulator and use a pencil magnet to pull out the modulator valve from the case then insert it back in to see if you feel any drag...If the valve slides in and out smoothly, no...
  14. NickTransmissions

    TH-400 Engagement Delay?

    You're welcome, Ken...The first thing I'd do is get it up to normal operating temperature and to the point where it's responding normally then check fluid level. As Matt said, converter drain back can occur if the vehicle sits for ages but if it's happening again shortly after you've driven it...
  15. NickTransmissions

    TH-400 Engagement Delay?

    So your symptoms didn't materalize until after you installed the pan? What specific pan did you install?
  16. NickTransmissions

    700 r4 trans pan ?

    Not without a pick-up extension tube. The filter has to have a slight interference fit with the pan to keep it held in place. Otherwise it may slip out of the pump, either partially or totally...If it partially slips out, you'll have major oil starvation issues and start burning things up. If it...
  17. NickTransmissions

    700R4 Information Thread

    You can run the 298mm shaft in the 716 drum and that will work with a 303/304 700r4 pump as is. DO NOT install the 4L65e pump (any parts of it, except the rotor-slide as they can be swapped in) into the 700r4. They are not interchangeable without extensive modifications, revisions and...
  18. NickTransmissions

    @NickTransmissions

    Your TV plunger and sleeve may be worn...I'm dealing with the same issue for one of my 700s (good line pressure at idle but no line rise). You can: 1. Try a diff valve body 2. Install Sonnax's 700R4 TV sleeve and plunger kit (77966-94K) or their hp sleeve and plunger kit (77966-94MK). The...
  19. NickTransmissions

    Transmission issue 4L60e

    Has it been previously functioning normally or are have you and him just installed everything and now having problems? Is the transmission freshky rebuilt or is it used?
  20. NickTransmissions

    @NickTransmissions

    You're welcome, man. Your idle pressures look good (manual low and 2 are a tad low but ive seen them on the low side before without adversely impacting transmission health and function. Take it on a short road test to see if you get any line rise at all - dont floor or get on it too much. If you...
  21. NickTransmissions

    @NickTransmissions

    Hi Patrick, The cable should be tight when adjusted correctly however the only way to know for sure is to hook up a gauge. The HF gauge should work though I'd spring for a Snap on, Mac, Matco, etc but if HF warranties their gauges, you can bring it back if it fails on you. Not sure if you...
  22. NickTransmissions

    Transmission paint

    Lots of power washing and some wire wheeling with various sized wheels and length stems. Here's what it looked like initially
  23. NickTransmissions

    transmission oil change

    You're welcome...Check your area for a local Transstar distributor/OTC retailer. If one is present, they will have everything you need and possibly for cheaper than Rock Auto when shipping is factored into the total price. ETA: If you still have delayed engagements only when cold after the...
  24. NickTransmissions

    transmission oil change

    Any Dex3 fluid will work; Dex6 full synthetic is backwards compatible but not necessary. If your filter is the cloth variety (probably is, if you're having delayed engagements cold only) then toss it in the trash and install a screen style filter. Never use the cloth type - they suck. Use a...
  25. NickTransmissions

    Transmission paint

    Yep, just mask everything off then rock and roll...

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