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  1. NickTransmissions

    Transmission Fluid Question

    what's Dexron 4? Use DexMerc, Dex6 or Ford Type F All prev versions of Dex apart from DexMec and Dex6 are obsolete and out of production, AFAIK.
  2. NickTransmissions

    Best rebuilt th 700R4?

    Nice work, @EvilGenius! Thank you for all the views - appreciate it :favorites13: Appreciate the support, @Broken85! I can build you a nice 700R4 for around that ballpark, largely depending on how you drive the vehicle...Depending upon what part of the year your 84 unit was built, you may...
  3. NickTransmissions

    K case 700R4

    At some point in the past, someone converted that unit from a 2WD to a 4WD.
  4. NickTransmissions

    4l80e conversion in 1985 suburban. What parts do I need?

    That should definitely help and make the whole powertrain perform better. The TC produces most of the heat that permiates through the transmission so tuning should help bring the heat down a bit. Plus full synthetic is perfectly fine up to about 220 or so, perhaps a bit beyond.
  5. NickTransmissions

    4l80e conversion in 1985 suburban. What parts do I need?

    Try to keep temps at 175-180 or so for optimum performance if running conventional Dex-Merc. Check for any restrictions in the system, in the lines, and coolers. As far as the harsh 1-2 shift, that could be overly agreessive mechanical calibration such as 1-2 feed orifice drilled too large for...
  6. NickTransmissions

    4l80e conversion in 1985 suburban. What parts do I need?

    C3= communication, command and control. What exactly are your line pressures for all range positions at idle and at stall?
  7. NickTransmissions

    4l80e conversion in 1985 suburban. What parts do I need?

    Perform a driving line pressure test. Short shifts and TC shudder is likely low LP across the board, which is probably C3-driven. If LP is low, contact the company that man'ed or sold the controller for tech support, if you havent already done so.
  8. NickTransmissions

    700R4 Transmission Questions/Issues

    Another possible idea - overhaul the transmission. It's shot. Not sure why you refuse to believe or accept that but common sense is telling you to yank it, throw it on your tear down bench and go through it.
  9. NickTransmissions

    700R4 Transmission Questions/Issues

    Yank it for overhaul. Install 97+ 4L60E bonded pistons and corresponding ret spring assy in the forward drum. Ensure the pump is vacuum tested, particularly the pressure regulator valve. Let us know what you find once it's torn down.
  10. NickTransmissions

    700R4 Information Thread

    There seems to be a leak in the manual low circuit as 110 PSI is too low if that reading is at full TV, per my guide. Ask the trans builder if he installed a Sonnax o-ringed reverse boost valve (I think the ratio is .283) - the o-rings seal off an otherwise worn bore where manual low pressure...
  11. NickTransmissions

    4l80e conversion in 1985 suburban. What parts do I need?

    Looks nifty.
  12. NickTransmissions

    4l80e conversion in 1985 suburban. What parts do I need?

    Looks nifty. So the mechanical side of the box uses a cable to connect it to your dash while an electrical cable goes from the other side of the box to the VSS? The box then converts the VSS voltage vehicle speed signal to a mechanical output to the speedometer in your dash's gauge cluster?
  13. NickTransmissions

    4l80e conversion in 1985 suburban. What parts do I need?

    Please tell me you're joking...I'll buy that. Why do you need to keep the mechanical speedometer? You're much better off simply putting your cell phone in a holder on the dash or windshield somewhere, bringing up the app Waze and using that as your speed indicator. You can also run a Dakota...
  14. NickTransmissions

    700R4 Transmission Questions/Issues

    Perform a line pressure test - see my 700R4 Information Thread on how to do this. You're flying blind without knowing where your baseline transmission pressures are at the current TV set up and adjustment. If your line pressures are within spec, drop the pan and see what's at the bottom...If...
  15. NickTransmissions

    TH400 Information Thread

    Id outsource the bushing R/R to a shop...Alternatively there is a dedicated Kent Moore branded bushing service set, J-21465-01 for TH400s available on eBay from time to time. It's not cheap but will allow you to r/r all the bushings. Get a Th350 pump bearing and a couple shims (.010, .015) for...
  16. NickTransmissions

    Tv cable

    It makes too much sense for people asking for help to give all the relevant information to make it easier for other members (members who are taking the time to volunteer their knowledge, assistance and experience for NOTHING) to more efficiently and effectively help the requesting party. I'll...
  17. NickTransmissions

    Buying a rebuilt transmission th350

    Nice work, @Craig Nedrow !
  18. NickTransmissions

    700R4 Information Thread

    You're welcome, man...Sometimes the valve body is no good but there's no clearly identifiable reason...I am working on designing a vacuum test plate for those 700R4 VBs so that they can be thoroughly tested and weaknesses identified before bolting them back on...
  19. NickTransmissions

    700R4 Information Thread

    To be clear, you have NO 3-4 upshift? If so, check the 4th gear servo piston's scarf cut sealing ring - it's on the inside of the servo cover. If that's in good shape, drop the pan, VB and see if any valves are sticking (3-4 throttle valve/spring/sleeve and 3-4 shift valve, 3-4 relay valve...
  20. NickTransmissions

    700R4 Information Thread

    Bumping this up with another video - this one showing the pump repair/ream job and installation/testing of the Sonnax oversized pressure regulator valve...The original valve was heavily worn and likely contributed to the myriad of drivability symptoms that plagued this unit while it was in the...
  21. NickTransmissions

    Buying a rebuilt transmission th350

    Don't know the answer to that until you post the build sheet so we can see what was installed. If it's a purely stock rebuild with none of the requisite updates that need to go into all TH350s upon overhaul, then yes - $750.00 is too high because you'll be into yours for less in parts once all...
  22. NickTransmissions

    Buying a rebuilt transmission th350

    I'd definitely rebuild your existing unit if the guy wants $750, unless he has paperwork showing exactly what was installed, all the parts that should have been installed were installed, when the work was performed and how many miles at the time of the rebuild as well as a means for you to...
  23. NickTransmissions

    Buying a rebuilt transmission th350

    How would anyone be able to answer that question if we don't know what you would be paying the seller for this other unit?
  24. NickTransmissions

    350 TRANSMISSION SPEEDOMETER GEAR HOUSING

    Pull off the extension housing then remove it from the inside.
  25. NickTransmissions

    700R4 Information Thread

    Hey All, bumping up the thread with a video on the "Nemesis" Rebuild profile ... This will be the first in a series of vids capturing the build-up...I'll post here as each gets published to my YT channel. Enjoy and TIA for watching!

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