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  1. NickTransmissions

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

    Glad you were able to get it fixed! That said, it wont be the problem here as the 700R4 doesnt use a vacuum modulator. The modulator system for managing line pressure and p/t shifting was replaced with the throttle valve system for the same purposes in the 700R4.
  2. NickTransmissions

    HT350 and Overdrive Question

    No towing in OD if you can avoid it...trans coolers are always recommended, esp in heavy duty applications like towing/hauling. There's a few other things Id do to the transmission specifically for towing, let me know if you need a quick list of them. Main thing you need to know with the...
  3. NickTransmissions

    TH400 Information Thread

    You're welcome, man...Very interesting, will have to try that out at some point...
  4. NickTransmissions

    TH400 Information Thread

    That appears to be a Borg Warner 4R100 45-element heavy duty sprag.
  5. NickTransmissions

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

    Agreed - ive rebuild several Monsters and they leave a lot to be desired...I also provide a brand new detent cable with all my 700R4s and 200-4R builds to eliminate the stretched/worn cable scenario as it is common for them to not hold or simply snap. Even when the customer burns up the 3-4...
  6. 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...
  7. 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...
  8. 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.
  9. 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...
  10. 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?
  11. 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...
  12. 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.
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
  21. 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.
  22. 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...
  23. 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
  24. 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...
  25. 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.
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