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  1. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    What do you mean by "no going back"? Internal dual feeding involves simply tapping the high reverse feed passage in the case for a 3/8x16 or 3/8x24 set screw then installing the set screw, leaving the high drum's center seal out and middle large stator sealing ring. All of that is reversible...
  2. NickTransmissions

    TH400 Information Thread

    Yep, minimal mods to get TH400s to survive/thrive in high HP, high rom applications. Ill retro a 97+ 4L80E direct drum in to L71+ TH400s that come with that stupid intermediate roller clutch so i can run the BW 34-element sprag instead. Can run a full 4L80E int piston and clutch pack as well if...
  3. NickTransmissions

    TH400 Information Thread

    You're welcome, @Sgt Gus! Keep an eye on it, note that if your shifts start becoming late and real harsh, that could be a sign of high line pressure, which is common in these units as they wear/age...A pressure test can quickly rule that in or out.
  4. NickTransmissions

    TH400 Information Thread

    Relatively normal for TH400s - some are more abrupt than others...My guess is that both forward and direct drums in yours have no cushion plates installed (the direct clutch is also used in reverse) and the center lip seal in the forward drum has either been omitted during a prev rebuild or left...
  5. NickTransmissions

    TH400 Information Thread

    The engagement into Rev or Drive is harsh or it's physically more difficult to move the shifter itself into gear?
  6. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Replace both...Dex/Merc for fluid; auto parts stores will carry the correct modulator for your trans, just let them know you have a TH350...
  7. NickTransmissions

    TH400 Information Thread

    The BIBLE for servicing, rebuilding and modifying the TH400! Also, BOLO for his TH350 book as well, if you work on those.
  8. NickTransmissions

    1984 k10 700r4 won't shift out of 2nd please help!

    You're welcome Potential causes: - Poorly set up and/or misassembled 3-4 clutch - Leaking 2-3 accumulator check ball capsule (rare) - Turbine shaft sealing ring (2nd from bottom, bottom ring or both) pinched upon installation of the pump assembly into the case - Worn, non-servicable pump...
  9. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Having a contingent of racing customers is always good for business and if you build trust w/them, do right, etc they won't ever go anywhere else... I never install the shift kits as you can do pretty much everything the B&M kits call for independently, and largely same for the Transgo stuff as...
  10. NickTransmissions

    1984 k10 700r4 won't shift out of 2nd please help!

    The 3-4 pack is smoked...Drop the pan to confirm but it will need to go back to the shop for rework. Once you get it back and installed, you must perform a pressure test to validate your TV cable set up and adjustment are good to go...I give all my 700R4 and 200-4R customers detailed...
  11. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    It's up to you but isn't necessary if only doing a service as described in my post above...If you're going to be pulling it you should just overhaul it, esp if it hasn't been gone through before and has more than 100k on it...First drop the pan and see what the fluid and bottom look like...if...
  12. NickTransmissions

    1984 k10 700r4 won't shift out of 2nd please help!

    Re-read the above, particularly your description about what's happening during the 2-3 shift and it does seem like your 3-4 pack is going out...Sometimes it starts out as a flare shift from 2nd to 3rd where RPMs jump for a second or two then 3rd engages at a slightly higher RPM than previous but...
  13. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    If you want to service both accumulators, you'll need to drop the valve body and remove the little 'e' clip holding the 2-3 accumulator in place then compress the spring to install the new piston w/sealing ring...I'd strongly recommend doing so if your trans has a plastic 2-3 accumulator piston...
  14. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Won't comment on wheel bearings as it's outside the scope of this thread but as far as assuming, it's never a good idea...Always ask your transmission builder exactly what they do to the transmission, even it it means making a checklist and going through line by line. Too many folks assume x...
  15. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    I've done a few GM FWD transmissions, 4T60s and 4T65Es those are fairly straight forward but not touched anything foreign like Hondas, Toyotas etc... Yep, I mentioned that it is very common to see the 1-2 acc spring broken; in fact I replace that spring with a brand new one on all TH350s I...
  16. NickTransmissions

    1984 k10 700r4 won't shift out of 2nd please help!

    What are your line pressure readings at idle, min TV and full TV? If you dont know, find a transmission pressure gauge, hook it in and run the line pressure test. Follow these instructions, let us know the results.
  17. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Dex/Merc is perfectly fine in the older GM transmissions; Dex6 wouldn't hurt but it's usually not worth it unless racing/super heavy duty towing hauling. Since the fluid is 10 years old, I'd probably change it but Dex6 isn't critical in this case. You also quoted my posts and asked me about...
  18. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Read post 10 and all my replies afterward. Modulator is irrelevant in this particular case. Doesnt matter in this case
  19. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    Yea, could be (think the 94 Vettes and F-Bodies had OBD2-compliant PCMs installed so hardware integration started earler than 96) but as far as I know, there were no vehicles anywhere manufactured with full OBD2 software, programming and hardware until 1996. But I would be interested to learn...
  20. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    GM started putting ODB2 ports into vehicles in 1995 but didnt switch over to the OBD2 software and programming standard until '96.
  21. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    PWM was introduced in 1995 for the 4L60Es so any ODB-1 TCC/component slipping codes would have applied for that year. Those codes were all two-digit codes without alpha-prefixes. 1993 vettes had 700r4s; they transitioned to 4L60Es in 94.
  22. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    First gear is irrelevant to the mechanical leverage problem at higher throttle angles that can occur in overdrive (4th gear) when paring an overdrive transmission with something like a 2.73 final drive ratio or less. The 3.08 to 1 FD is the tallest ratio that I have seen that still works with...
  23. NickTransmissions

    700R4 Information Thread

    Keep the anchor aside, there's a few valuable parts from it that i can use so can give you a little bit of credit for it towards your build when you're ready..ill let you know if i come into an 88-92 core as well.
  24. NickTransmissions

    700 r4 trans pan ?

    4L60=700R4; GM simply changed the naming convention in the early 90s so yes any 700R4, 4L60 or shallow-pan from a 93-97 4L60E will work on any year 700R4.
  25. NickTransmissions

    700R4 Information Thread

    I can but if it has the 27-spline small-diameter input shaft (82-E84), you have to pay for a later (L84-87) pump and input drum. Both of those parts together are very expensive and hard to find. Count the splines on the input shaft to comfirm/deny... I thought you picked up a 90 or 91 core...

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