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  1. NickTransmissions

    th350 overhaul direct/forward clutch clearance

    Direct clutch should have four (4) frictions & four steels, unless you're counting a wavy/cushion steel...Direct clutch clearance should be fine at .025-.030"...Book calls for .015-.095" but I feel anything more than .060" is somewhat excessive if using a 4&4 set up...Your 2-3 shift will be on...
  2. NickTransmissions

    700R4

    What was wrong with the converter that made it incorrect for the transmission? Was it set up for a 27-spline input shaft instead of a 30-spline? If so, your 700R4 is an early 1984 unit. Late '84 saw the intro of the 30-spline input shaft, "152" drum casting, large-dia stator shaft and new...
  3. NickTransmissions

    1986 Automatic Transmission Leak

    Replace your pan gasket (DO NOT USE a cork gasket), speedometer cable/housing seals snd rear transmission mount. Check the governor cover seal, replace that also if leaking. Double check the selector shaft seal - replace if leaking.
  4. NickTransmissions

    Th350 rebuild (lost drive gears)

    What gouge? Shoot a high quality picture of this gouge and post it Why would you think a torn lip seal inside of the forward drum would result in an external leak? Can you post a picture of the rebuild kit that you mentioned above? A link is fine also but a picture makes it a lot quicker for...
  5. NickTransmissions

    Th350 rebuild (lost drive gears)

    They're not strictly required though if you run across one, you can put it on...They're sold by Transtar for a few dollars apiece, I believe.
  6. NickTransmissions

    Th350 rebuild (lost drive gears)

    That second pic does appear to show a cut forward piston lip seal. yea, take another picture but even a small laceration is sufficient to cause the damage sustained by that forward clutch. Also check the underside of the forward clutch pressure plate and see if there are no little indexing...
  7. NickTransmissions

    Th350 rebuild (lost drive gears)

    Yup! Now you need to find out why that clutch pack burned...Otherwise, you may repeat history w/it...The Direct clutch burns frequently but the forward clutch is always on unless you're not in a forward range position so it's not often burnt on failed TH350s...Check the lip sealing surfaces and...
  8. NickTransmissions

    Th350 rebuild (lost drive gears)

    Maybe it was - you should have four clutch packs on the bench but I only see three so post a picture of the one not already shown and we will go from there. do you have the ATSG Manual for these transmissions? If not, that should be your very next move - DO NOT rebuild any auto trans without...
  9. NickTransmissions

    Th350 rebuild (lost drive gears)

    Where's the forward clutch pack? Dont see it in any of the pics above - what kind of shape is it in? How are the lip sealing surfaces on the forward clutch piston? Are they hardened, torn, etc? Direct clutch looks smoked but could be the lighting making it look worse than it is. Intermediate...
  10. NickTransmissions

    1986 sbc th350 ran dry on ATF :o

    Here's one series to add to your list, asssuming you havent already seen it:
  11. NickTransmissions

    1986 sbc th350 ran dry on ATF :o

    Yank it for overhaul; replace both one-way clutch assemblies in addition to frictions, steels, coast band. If you have no forward movment in Drive, 2 or manual low, the low roller clutch may have failed. Also install a Sonnax HD outer sprag race (goes on the direct drum).
  12. NickTransmissions

    700R4 Information Thread

    Good question, unfortunately I'm not sure as you're really asking an 'electrical' question as opposed to a transmission question and I'm a fish out of water when it comes to electrical!
  13. NickTransmissions

    1986 sbc th350 ran dry on ATF :o

    1. Fwd clutch and/or rear roller clutch assembly has failed; reverse uses the low reverse clutch and direct clutch to work 2. Perhaps was underfilled to begin with; try topping it off to see if anything happens in Drive/2/Low 3. See #2. If it doesnt work, yank it out for overhaul. Likely needs...
  14. NickTransmissions

    700r4 slipping in cold weather

    Again, what are the results of your pressure testing? Stop guessing and do a pressure test so you know exactly where you stand. Let us know the results whenever you have them.
  15. NickTransmissions

    700r4 slipping in cold weather

    What are the results of your pressure test?
  16. NickTransmissions

    700r4 slipping in cold weather

    You just bought it? If so, I'm willing to bet that thing was on it's way out for some time and the prev owner poured a barrel full of lube guard stop slip to make it work long enough to survive any test drives prospective buyers may take with it...This assumes you dont know the previous owner...
  17. NickTransmissions

    700R4 Information Thread

    Agree, I'm not a fan of TCC apply strategies that include lock up in earlier gears...I'd prefer it to lock in fourth only but GM engineers where trying to squeeze every last ounce of fuel economy out of those cars/trucks back then...They repeated the same strategy with the six speeds...The 6L...
  18. NickTransmissions

    Engine Swap Transmission Selection

    Treat all used transmissions as rebuildable cores; dont pay any more than $200.00 for a core. If going to the pick and pull, tear down the transmission so you can see if it's ok to rebuild on or damaged goods (broken hard parts).
  19. NickTransmissions

    700R4 Information Thread

    1982-E84, many 700R4s had a TCC apply strategy that included 2nd gear. You can tell, broadly speaking, how the trans was set up by counting the number of pressure switches on the valve body. While there were some variances over the course of the 700R4's production lifecycle, generally speaking...
  20. NickTransmissions

    700R4 Information Thread

    Type F is a Ford formulation. Has slightly different friction modifiers compared to the Dextron stuff.
  21. NickTransmissions

    700R4 Information Thread

    I think it is; if so, it should yield slightly firmer shifts using clutches/bands designed for Dextron, as he mentioned...
  22. NickTransmissions

    700R4 Information Thread

    Loss of fourth gear / falling out of fourth can indicate burning/heavily stressed 3-4 clutch pack. Fluid-wise, you can use DexMerc, Dex6 or Dex Multi-blend fluid. Ive never used Mercon V, which is for Ford units but cant say it's bad/harmful... Do a line pressure test and let us know the...
  23. NickTransmissions

    Engine Swap Transmission Selection

    I made a video showing all the tools I use to build 700R4s and 4L60Es; there isnt too many special tools... My 4L60E playlist has several tear down and inspection as well as reassembly step by step vids. If you do decide to rebuild it yourself, purchase the ATSG manual for those...
  24. NickTransmissions

    700R4 Information Thread

    Test at operating temp as colder fluid may throw inaccurate readings. Yes, min and full TV at 1000 RPMs....You should see fast and/or instant line pressure rise going from minimum to full TV on the cable. If you don't see any line rise, you'll need to begin the trouble shooting process - we'll...
  25. NickTransmissions

    700R4 Information Thread

    @1979 K10 - Factory lock up strategy for your year/model has the TC clutch applied in 3rd and 4th gear however if someone modified the lock up via a toggle switch, I suspect they intended for it to activate the TCC in 4th gear only and only when they flip the switch...So if that's the case (you...

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