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  1. NickTransmissions

    Rebuild th400 or 4l80e?

    What year is your TH400? It will if the direct drum that came in your TH40 has a smooth race (1964-1970 units have it). If it has a cammed race for a roller clutch (1971+) you either have to buy the 8-element roller assembly or swap to a 4L80E direct drum. If you do so and use the 4L80E outer...
  2. NickTransmissions

    Rebuild th400 or 4l80e?

    Contact transpartswarehouse.com on Monday and request the intermediate and low roller one way assemblies for your TH400. Specify the type of intermediate OWC you need (dog bone sprag or roller type assembly). Also if your application is high RPM, street-strip - increase intermediate clutch...
  3. NickTransmissions

    700r4 tv cable adjustment

    I used that kit once, took seemingly forever to get it all installed, lol. IIRC it used to be called the "SK700-SR". I typically install the JR kit and do other things to the VB as needed/required... Gauges are cheap, smoked transmissions due to TV cable issues are not...Amazon has combo...
  4. NickTransmissions

    Th350 not shifting

    How much vacuum is the engine making and how much at the modulator? Also check the governor gear as Matt suggested - make sure the gear isnt stripped. If governor is fine and vacuum is sufficient, call the builder. Could be valve body or issue with the intermediate clutch itself.
  5. NickTransmissions

    Rebuild th400 or 4l80e?

    I normally dont use shift kits in TH400s and 4L80Es as they arent necessary. Dual feed the direct clutch internally, rollerize the output thrust flange, install the Sonnax TH400 boost valve/sleeve and spring kit, drill the high clutch feed out per your converter stall speed and desired shift...
  6. NickTransmissions

    Rebuild th400 or 4l80e?

    Run it through the radiator then to the ext cooler. You're giving up a lot of heat exchange by not including the internal cooler in the system. Also, Id swap in a 4L80E if it's in your budget to do so.
  7. NickTransmissions

    Torque Converter and Transmission Assembly Question - Help Needed

    Huh? What are you talking about? I am my R&R guy for my stuff, that's it. Beyond that, I only do bench/carry out.
  8. NickTransmissions

    700R4 won’t stay in overdrive

    Yep - run the 4L65E Alto 3-4 clutch and steel module. Has seven friction dics and six steel plates vs six and five for 700s and 4L60Es; you'll need the 4L65 apply and backing plate. Additionally, run the 4L60E 97+ bonded apply pistons and 2nd design return spring in the forward drum. Larger...
  9. NickTransmissions

    700R4 won’t stay in overdrive

    You're correct. The 3-4 clutch is going out. Drop the pan to confirm (and to drain the fluid) . If you see burnt clutch material, put the pan back on with a few bolts and yank it out for overhaul. Install a new torque converter as well. Upgrades for towing include: - Transgo Jr shift kit -...
  10. NickTransmissions

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

    You're welcome, man...Glad the thread has been a help to folks.
  11. NickTransmissions

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

    Glad it's working (i.e. not leaking) but keep an eye on it...I've been told by folks who tried it said it started to leak after a while...DYIers have a bit more flexibility when it comes to risk and your appetite for it will always be greater than a transmission builder's given we do this for a...
  12. NickTransmissions

    Torque Converter and Transmission Assembly Question - Help Needed

    Not sure where you are with this but if you fill the converter with a quart or two of fluid, install it so it's fully engaged on both sets of splines and the drive gear then start spinning the converter, you will begin to see fluid dribbling out of the supply line fitting on the trans. That...
  13. NickTransmissions

    TH350 Valve Body Modded

    Check to see if the direct clutch was dual-fed internally. If so, that's likely the reason the 2-3 accumulator circuit was blocked off. Also, measure the 1-2 and 2-3 feed orifice diameter - chances are they were enlarged sigificantly for use with a high stall converter. Was the 1-2 acc spring...
  14. NickTransmissions

    4L80E Information Thread

    Expect to see upwards of 300-350PSI in reverse at middle-to-higher throttle angles; about 220-275psi in Drive at the same T angles.
  15. NickTransmissions

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

    Try it if you want but be prepared to do the job twice if it doesnt work out. Or simply get the correct pump body for that 05 case - not sure why that would be difficult as they're everywhere.
  16. NickTransmissions

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

    5KCD indicates a 2005 unit/case so you'll need to grab a 2004+ pump body that does not have an O-ring groove on the outer diameter if your existing transmission's pump body has an O-ring. The pump body and case were changed starting in 2004 - the change allowed the use of a perimeter wedge seal...
  17. NickTransmissions

    8l90E trans shudder

    You swapped an 8L90 into a Squarebody truck? If so, good on you for doing it! Would be curious how you went about it (complete engine/harness/PCM/trans swap, all factory from a wrecked Silverado or something similar? As for the shudder symptom, I am in agreement with @TotalyHucked in that it's...
  18. NickTransmissions

    TH400 Direct Drum/Sprag Question

    Replace the torque converter - never reuse a converter!! It's tantamount to putting dirty clothes on a clean body after showering. My converter builder overhauls them all the time. Looks for a good converter builder in your area
  19. NickTransmissions

    Govoner

    This issue is likely caused by a severely worn rear transmission case bushing. When the bushing is worn, it allows the output shsft to oscillate in ways that cause the drive and driven gear on the governor to fall out of mesh. Is this a two-wheel drive truck?
  20. NickTransmissions

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

    Ive been using those and similar valves for close to 15 years and so far, no issues but have heard/read other builders report those concerne. Use Transgo's TCC reg valve from their SK4L60E shift kit if you have reservations about the Fitzall valve - Ive never had any issues with them either.
  21. NickTransmissions

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

    Those will all work but I like the Fitzall valve as it completely seals the bore and is appx $25.00. The others convert the PWM to On-off as well and ill use those methods if the bore is otherwise fine when vac tested.
  22. NickTransmissions

    4L80E Information Thread

    Hi Vbb199 - please post your above question here: https://www.gmsquarebody.com/threads/4l60e-information-thread-includes-4l65-70-75.42240/
  23. NickTransmissions

    Advice on Transmission Fluid Change for 1980 C10

    The pan itself holds 4-5 quarts; the entire system holds like 8-10 (TH350/TH350C)... Anything DexMerc will be fine. If your TH350C (Im assuming that's what you have, correct me if I'm wrong) has a cloth style filter, remove and chuck it in the trash - install a screen style filter with new...
  24. NickTransmissions

    Looking to swap a 1979 Bonanza to an Automatic Overdrive

    You're welcome...I'm not sure on the t-case as that would depend on whether you had a driver side or pass side drop for the front diff but a nicely built 700R4, assuming your engine won't be making more than about 500 HP and/or full race, will make for a great cruiser on the hwy while still...
  25. NickTransmissions

    Looking to swap a 1979 Bonanza to an Automatic Overdrive

    700R4 is the most straight forward and cost effective swap.

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