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  1. NickTransmissions

    Hoping to switch from 700R4, to a newer 4L60E

    You can definitely go with a 4L60E, the main difference in terms of cost is the funds you'll need for the stand-alone controller to operate the 4L60E...There's several different options out there, including TCI, US Shift, MSD and more...Some of my customers running 4L60Es and 4L80Es use the TCI...
  2. NickTransmissions

    700R4 started shifting really high RPM

    Probably the TV valve but it's good to check both...I'd do the line pressure test before you take anything off/out. Let me know if you need instructions for conducting the test.
  3. NickTransmissions

    700R4 started shifting really high RPM

    Building transmissions, lol...Coincidently, I have two 700R4s going back together as we speak. I also suspect TV valve sticking, another mentioned Transgo's TV boost valve which is the way to go - I install them (and that shift kit) in all my 700R4s. The governor valve can also stick...
  4. NickTransmissions

    Hoping to switch from 700R4, to a newer 4L60E

    Agree with bucket, if the only concern is building the 700R4 to handle your ZZ4's output and usage pattern for the vehicle. Let me know if rebuilding and upgrading the 700R4 is something you'd consider... If you'd rather just have full electronic control (ie plug and play, no TV cable to set...
  5. NickTransmissions

    TH400 Rebuild or replace?

    Sounds like it needs an overhaul or possible replacement if you completely grenaded the gear train. Check out my TH400 Information Thread if you're considering rebuilding it yourself...Tons of resources, guidance, parts lists, mods and more... If you don't plan on taking on the rebuild...
  6. NickTransmissions

    PerformaBuilt 4L60E !!!

    If it has a full manual valve body, the early shifting would be a driver issue but, assuming a forward auto pattern shift strategy, I'm thinking it's stack-shifting due to either leaks in the apply circuit for 2nd or a valve body problem, unless the vehicle's PCM/controller was specifically...
  7. NickTransmissions

    PerformaBuilt 4L60E !!!

    Is the 1-2 upshift the only gear change that is early? How early is it relative to what your friend expects the shift to occur at? Is it happening at part throttle or WOT (or both)? What is his final drive ratio and converter stall?
  8. NickTransmissions

    Help with a possible transmission issue

    Grab a 1997-2000 4L60E core...If buying a two-piece case, ensure it has the 298mm input shaft as that (and the drum it's pressed into) will work in your 1988 700R4 and feature the updated return spring for which you can use the 4L60E 97+ bonded steel/rubber pistons....If you find two such cores...
  9. NickTransmissions

    Help with a possible transmission issue

    Sounds like low roller one-way clutch failure which is somewhat common on those units...I see it from time to time and retro a 4L60E center support w/the wider one-way clutch assembly to prevent further failures. I have an entire playlist on Youtube for that transmission, including detailed tear...
  10. NickTransmissions

    Help with a possible transmission issue

    Sound like forward clutch has burnt (or possible low roller one-way assembly failure), assuming you have the correct amount of fluid in the system. This is true regardless of what transmission is installed as they're all designed (and function) more or less the same way when it comes to the...
  11. NickTransmissions

    TH400 Information Thread

    Those are also great but I'm referring to the pan gasket that comes in the TransTec and Transtar paper and rubber kits.
  12. NickTransmissions

    TH400 Information Thread

    Unless the check ball seating locations are heavily worn and/or plate warped, damaged it should be reusable. I wouldn't buy any parts before you get it apart and on the bench...This way you can inventory everything you need and buy only those parts, unless this is your only vehicle...If that's...
  13. NickTransmissions

    TH400 Information Thread

    Hey bucket - converter stall RPM is actually the single most important factor to consider when mechanically calibrating a transmission's shift firmness (others are vehicle weight, application, gear ratio in the differential(s) & driver preferences). My guess is the feed orifices have not been...
  14. NickTransmissions

    4L60E Information Thread (Includes 4L65/70/75)

    Bumping this thread up with a new video on measuring servo travel/adjusting band clearance in 700R4s and 4L60Es....This vid is one of a two-part series and focuses on GM factory servo and hardware. PT2 will focus on aftermarket servo set ups (Coming soon).
  15. NickTransmissions

    PerformaBuilt 4L60E !!!

    Come back with a review when you have a chance; let us know how you like it.
  16. NickTransmissions

    91 v2500 4L80e retainer clip identification S.O.S.

    @enduroance - What you highlighted in the diagram is correct. The TCC apply, limit and enable valves are in the pump while the TCC regulator valve is in the valve body...Hope that helps.
  17. NickTransmissions

    91 v2500 4L80e retainer clip identification S.O.S.

    Damn - they mangled it for sure...Lol. That appears to be the converter clutch apply valve but you zoomed in so close it's actually hard to tell but I'm fairly positive that's what I'm looking at in the first picture. I'd grab a good-used snap ring and install it in place of what's...
  18. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Yea, I've cut them before as well, I wish Sonnax would include an extra O-ring in each boost valve kit...I think they used to sell extra o-rings in packages of 5 or 10 but can't find an active listing anywhere. I don't know the dimensions off-hand but just bring the o-ring with you to the...
  19. NickTransmissions

    4l80e rebuild gone wrong...

    You are good...Drilling the pump is fine, i do that on all my builds (same with all my lube mods to those units). You can also leave in the high rate return springs in the direct drum. Sounds like you patched the hole in the valve body and replaced the spacer plate with a stock plate so...
  20. NickTransmissions

    TRANS SWAP

    Id do a 4L80E with a stand alone controller. Best auto trans GM has ever fielded, IMO. You should have room in the trans tunnel but you can always take some measurements, post them and i can give 4L80e measurements to confirm/deny fitment. Also, why all caps (yelling)?
  21. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Hmmm...That may or may not have been a complete explanation, if that is all the content creator mentiond. The direct drum turns at thousands of RPMs relative to the engine when the trans is driving through it when in first or second gear. So any fluid under the direct piston will push the piston...
  22. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Will you be turning north of 6000 RPMs on a regular basis? I do show that hole being drilled in my 4L80E High Performance build series but that TH400 shown didn't warrant the additional bleed hole.
  23. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Here's my TH400 rebuild video series, Part 2 where I start discussing the process. I'll try to put together a quick video on the dual feeding itself perhaps later this week if time permits and post it here...I'll have all the steps consolidated into one short vid.
  24. NickTransmissions

    TH400 Direct Drum/Sprag Question

    That should work - put a little RTV or red loctite on the outside diameter of the cup plug prior to installation and don't install it until the case is fully assembled so you know that there's no possibility of it having to come apart again. I actually don't have a dedicated dual feed video but...
  25. NickTransmissions

    Anyone running an 8.1, what trans are you using?

    I've also noticed that last few years...I have a small inventory of them but prices for housings have been climbing rapidly on the used market...Also seeing cores with the ext housing missing.

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