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  1. 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
  2. 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...
  3. 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).
  4. 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...
  5. 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.
  6. 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.
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. NickTransmissions

    4l80e rebuild gone wrong...

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

    4l80e rebuild gone wrong...

    Sorry, lots of addl posts since my last, didn't read them all. That said, I'm assuming you still have no movement in any range, reverse, drive, D3, 2 or 1 - correct? If so, think a couple folks mentioned checking the T-case and/or rear end, which makes sense to do. Rule them in our out first...
  17. NickTransmissions

    4l80e rebuild gone wrong...

    Yep, plug that VB with a set screw. When was that picture of the stripped output shaft taken? Is that it's current state or was that taken prior to you rebuilding the unit?
  18. NickTransmissions

    4l80e rebuild gone wrong...

    The pawl never makes contact with the parking lugs on the output planetary when not in park unless the little pawl return spring was not reinstalled or installed it incorrectly and it's fallen, sitting in the pan. It's also possible the guide plate bolts were not snugged / torqued, worked loose...
  19. NickTransmissions

    4l80e rebuild gone wrong...

    Sorry to hear you're having trouble with it...These units can be a bit finicky however you need to take that stupid HD2 kit out of that transmission and put it on the shelf (can't even recommend you sell it as it would be knowingly passing all of the problems it creates onto someone else). Those...
  20. NickTransmissions

    1977 K10 Scottsdale Transmission wont shift

    Post the two-letter code on your ID tag if you know it and I'll let you know if it's a TH475 or HD TH400. The 475s went primarily into motor homes, school buses, box trucks and some diesel equipped C and P series trucks, etc...
  21. NickTransmissions

    1977 K10 Scottsdale Transmission wont shift

    Was the transmission just rebuilt or the engine or the entire truck? Not sure if you're referring specifically to an individual component or the entire vehicle. If the trans was just overhauled, take it back to the shop under warranty Regardless of whether it's a TH350 or 400, diagnostics are...
  22. NickTransmissions

    700R4

    Interesting...The case itself is a 1991 model year case, WAM indicates model however I don't know what specific model... What are you trying to install this 700R4 into? A Corvette or a Squarebody truck? Here's a break out of the casting numbers and their respective meanings:
  23. NickTransmissions

    700R4 from 305 to 350 sbc help

    How much power is your new 350 engine putting out (ballpark if not precisely known)? Depending on what you say, that 700R4 may need to be overhauled and strengthened...1988+ 700R4s were a good deal more durable than 1982-1987 units, primarily owing to the better 3-4 clutch packs and larger...
  24. NickTransmissions

    No forward gears suddenly, but still have reverse

    Assuming your C10 has a TH350, your low roller one-way clutch has likely failed - common with those transmissions. Anything beyond a stock rebuild should receive a 4L60E center support with new BW low roller one-way clutch assembly...The 4L60E center support swap is drop-in, meaning you don't...
  25. NickTransmissions

    THM350C alternatives or keep it?

    You're welcome, Geoduck. Also, dont be afraid to machine your direct clutch piston to add one more clutch and flat steel in an otherwise four-clutch stack up. You can do the same with the forward but it's usually not necessary outside serious HD or high performance.

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