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  1. NickTransmissions

    TH400 Information Thread

    You're welcome, man -thanks for having me on the forum. And yes, Ron Sessions books on the TH350 and TH400 are the 'bibles' for those transmissions. I was lucky enough to spot a listing on eBay for both of those books several months back, seller only wanted $75.00 shipped so I jumped on it...A...
  2. NickTransmissions

    700R4 Information Thread

    Bumping this one up....Ive been seeing a lot of threads on 4L60E transmission replacement lately and know not everyone can afford to drop $1500-$3000 on a complete rebuild on short notice so are looking to the used transmission market as a stop gap solution. To that end, I decided to do a video...
  3. NickTransmissions

    FNG here that used the search bar…

    Yep, you certainly are. Ive rebuilt over 2000 700r4s. How many have you done? Dont bother answering, its a rehtorical questions...off to the ignore list you go.
  4. NickTransmissions

    FNG here that used the search bar…

    Too funny...
  5. NickTransmissions

    FNG here that used the search bar…

    Yes it does...You'll generate a ton of heat without it. Ive seen enough of them and 200R4s come in where folks didnt install lock up kits and trans was scorched inside as a result. You can convert the trans to take a non-lock up converter via Transgo's conversion kit and simply install a...
  6. NickTransmissions

    FNG here that used the search bar…

    Yes it does, or trans overheating will be a fast follower. Th350Cs its not as critical. Yes - converter stall engine speed is irrelevant when it comes to whether or not the tcc is active and working. That said the higher the stall speed, the more heat generated all other things equal so make...
  7. NickTransmissions

    82 k1500 lost all forward gears no warning signs at all

    Its done...Yank it out, rebuild it. ETA: If you lost all movement suddenly and it was working fine in the preceding days/weeks, I'd guess your low roller clutch in the center support failed. Very common in the TH350
  8. NickTransmissions

    74 k10 going 55 mph is at 3,500 rpm

    Swap in a 700R4 and cruise at 70 mph/2000 rpms or so.
  9. NickTransmissions

    82 k1500 lost all forward gears no warning signs at all

    Yank it out, tear it down and inspect for hard part damage. Once cleaned up, grab two things to increase strength/mitigate two very common TH350 pattern failures at minimal cost: - 4L60E center support: Drops in with no mods and its low roller clutch is much less prone to failure - Sonnax HD...
  10. NickTransmissions

    91 burb runs terrible in reverse

    On a level grade with no vehicles or anything else behind you, throw it in reverse, keep foot off gas pedal. It should move in reverse on its own without any throttle input. If it doesnt or slips, the trans needs to come out. ETA: If you suspect a short to ground where the electrical system is...
  11. 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...
  12. 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?
  13. 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.
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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.
  21. NickTransmissions

    Turbo 350 (TH350) Information Thread

    You're welcome, @Fat 454 !
  22. 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...
  23. 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...
  24. 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...
  25. NickTransmissions

    TH-400 Engagement Delay?

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

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