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  1. NickTransmissions

    91 v2500 4L80e retainer clip identification S.O.S.

    @enduroance - What you highlighted in the diagram is correct. The TCC apply, limit and enable valves are in the pump while the TCC regulator valve is in the valve body...Hope that helps.
  2. NickTransmissions

    91 v2500 4L80e retainer clip identification S.O.S.

    Damn - they mangled it for sure...Lol. That appears to be the converter clutch apply valve but you zoomed in so close it's actually hard to tell but I'm fairly positive that's what I'm looking at in the first picture. I'd grab a good-used snap ring and install it in place of what's...
  3. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Yea, I've cut them before as well, I wish Sonnax would include an extra O-ring in each boost valve kit...I think they used to sell extra o-rings in packages of 5 or 10 but can't find an active listing anywhere. I don't know the dimensions off-hand but just bring the o-ring with you to the...
  4. NickTransmissions

    4l80e rebuild gone wrong...

    You are good...Drilling the pump is fine, i do that on all my builds (same with all my lube mods to those units). You can also leave in the high rate return springs in the direct drum. Sounds like you patched the hole in the valve body and replaced the spacer plate with a stock plate so...
  5. NickTransmissions

    TRANS SWAP

    Id do a 4L80E with a stand alone controller. Best auto trans GM has ever fielded, IMO. You should have room in the trans tunnel but you can always take some measurements, post them and i can give 4L80e measurements to confirm/deny fitment. Also, why all caps (yelling)?
  6. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Hmmm...That may or may not have been a complete explanation, if that is all the content creator mentiond. The direct drum turns at thousands of RPMs relative to the engine when the trans is driving through it when in first or second gear. So any fluid under the direct piston will push the piston...
  7. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Will you be turning north of 6000 RPMs on a regular basis? I do show that hole being drilled in my 4L80E High Performance build series but that TH400 shown didn't warrant the additional bleed hole.
  8. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Here's my TH400 rebuild video series, Part 2 where I start discussing the process. I'll try to put together a quick video on the dual feeding itself perhaps later this week if time permits and post it here...I'll have all the steps consolidated into one short vid.
  9. NickTransmissions

    TH400 Direct Drum/Sprag Question

    That should work - put a little RTV or red loctite on the outside diameter of the cup plug prior to installation and don't install it until the case is fully assembled so you know that there's no possibility of it having to come apart again. I actually don't have a dedicated dual feed video but...
  10. NickTransmissions

    Anyone running an 8.1, what trans are you using?

    I've also noticed that last few years...I have a small inventory of them but prices for housings have been climbing rapidly on the used market...Also seeing cores with the ext housing missing.
  11. NickTransmissions

    Anyone running an 8.1, what trans are you using?

    Yes, it's much cheapier/easier/less work to make it fit your truck. Watch this video for tips/pointers/things to look out for when buying a used 4L80E
  12. NickTransmissions

    Anyone running an 8.1, what trans are you using?

    Yep, heating or a hammer/drift punch will install it quick...easy deal. I just didn't want anyone to think it was a matter of just popping off the ext housing and r/r just the output shaft without taking the transmission apart (Ford 5R110s and Allisons are convertible by just removing the back...
  13. NickTransmissions

    Anyone running an 8.1, what trans are you using?

    Converting a 4WD 4L80 to 2WD requires complete disassembly of the transmission, including swapping the 4WD output shaft for a 2WD and adding the OSS reluctor gear pick up to the output carrier (91-93 4WD 4L80Es had these from the factory but 94+ omitted it).
  14. NickTransmissions

    4l80e rebuild gone wrong...

    Damn, lol - smoked is right! Those look like were dragging real bad, if that was the source of your issue. What was your clearance when you rebuilt the trans for the first time? Rip all parts from that stupid HD2 kit from the transmission except the direct clutch high rate return springs...
  15. NickTransmissions

    4l80e rebuild gone wrong...

    If the L/R piston itself is cracked, l would think he'd have no reverse (depending on location and severity of the crack). I also suspect the 1-2 acc circuit could be x-leaking into the L/R circuit (or low roller issue) but we wont know until the post-mortim report... Ouch.
  16. NickTransmissions

    700R4 Skipping 2nd Gear

    Oh ok, if rev works, sun shell is intact for now. Replace with the Sonnax Smart sun shell when you go back together with it. Never reuse the torque converter. Find a good local converter builder and have him rebuild it.
  17. NickTransmissions

    700R4 Skipping 2nd Gear

    Others mentioned sun shell so if you dont have reverse either, that's likely what happened. Those shells are made of soft metal and usually strip at the neck splines or spines separated from the body. Rebuild yours so you know what exactly went into it. Check out my 700R4 Info Thread for...
  18. NickTransmissions

    4l80e rebuild gone wrong...

    The forward clutch, which is responsible for giving you first gear in Drive, is applied and the low roller clutch assembly is holding...Upon the shift to 2nd gear, the intermediate clutch comes on, the intermediate sprag begins holding and the low roller clutch releases and begins to free-wheel...
  19. NickTransmissions

    700R4 Skipping 2nd Gear

    If you have 4th but not 2nd, I'd pull the servo assembly out and see if any of the o-rings or sealing rings are damaged...If not, the band is likely shot and you'll need to yank for overhaul. If you don't have second or forth, i.e. the PCM is commanding an upshift into 2nd from 1st and into 4th...
  20. NickTransmissions

    4l80e rebuild gone wrong...

    You're welcome. You don't need that tool, thought it makes it nice and easy.. The method you can use without any special tools beyond a pair of dial calipers is shown in my TH475 Rebuild Video - skip to 53:09. I'd air check the intermediate clutch again though when you do it with the case on...
  21. NickTransmissions

    700R4 Skipping 2nd Gear

    Are you confident you have the correct amount of fluid in the system now? Do you have 4th gear or no? How you answer question 2 will determine what I recommend you do next...
  22. NickTransmissions

    4l80e rebuild gone wrong...

    The Transgo boost valve is fine but I prefer the Sonnax version given it has O-rings which completely seal off any leakage between the sleeve and casting in the boost circuit. One way clutches can be installed backwards so make sure you check that whichever OWC you're checking that it spins in...
  23. NickTransmissions

    4l80e rebuild gone wrong...

    When you say, "first gear wouldn't shift until high RPM" are you meaning to say that it's not upshifting into 2nd gear until very high RPM or it doesn't begin to move forward until you have to really put your foot in it to get it moving? Binding in 2nd gear may be caused by a problem with the...
  24. NickTransmissions

    th400 forward drum front pump

    Do you have a question? And that pump part that the two [sealing] rings go on is called the stator. ETA - take the sealing rings off and see if it will go. If it's still getting stuck, yank the new bushings back out, install the rear bushing back in and try again. If it slides on, reinstall...
  25. NickTransmissions

    4l80e rebuild gone wrong...

    No upshift from first gear? Plug the speed sensor back in.

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