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  1. 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.
  2. 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/
  3. 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...
  4. 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...
  5. NickTransmissions

    Looking to swap a 1979 Bonanza to an Automatic Overdrive

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

    TH350 shifting troubles

    Check your external shift linkage for anything loose, etc. If nothing out of the ordinary is observed, drop the pan and see if you have a bunch of burnt clutch material at the bottom...If so, it's likely the remains of your low reverse clutch pack. Trans would have to come out for overhaul.
  7. NickTransmissions

    From 350 trans to 400 transmission

    Have your existing drive shaft cut and rebalanced or a performance driveshaft made ss mentioned above. Trans cross member will need to be moved back which is straightforward...
  8. NickTransmissions

    Slow Climb To The Top

    You're welcome...For some reason i had it in my head you have a TH350 but since you have a TH400, you wont have any kick down cable but instead, a detent solenoid. Check that detent solenoid by dropping the pan and visually inspecting the solenoid and its wire for wear. There's a little metal...
  9. NickTransmissions

    Slow Climb To The Top

    They are small abrasive hones for use on valve body and pump bores where valves are located. Same concept as bottle brush hones for engine cylinders, and same procedure...
  10. NickTransmissions

    Slow Climb To The Top

    Hey man, responded to your post on Youtube - here's the copy: I'm thinking either kick down cable possibly out of adjustment, kick-down valve sticking in its bore in the valve body or vacuum modulator system not functioning...I'd first check vacuum at the modulator to ensure you have at least...
  11. NickTransmissions

    4L80E Clearance Issues?

    That sounds like you're leaning towards a TH400 with a gear vendors overdrive unit bolted onto the back of it. The 4L80E would serve both functions but the former would be purely mechanical with (as far as I know) no PCM/ECM/Electronic control..You'd just have the detent solenoid in the...
  12. NickTransmissions

    4L80E Clearance Issues?

    So what type of transmission do you want? If an automatic, what would you prefer to have? The choices could range from a TH350/400 to a 10L90 but prob lies somewhere in between...Given you're likely installing a 6.2, perhaps upgrading it's power output a bit and want overdrive, I'd recommend a...
  13. NickTransmissions

    4L80E Clearance Issues?

    Hi Shane, Are you looking for input on possibly doing a 6L80 or 6L90 swap for your truck?
  14. NickTransmissions

    TH400 drive off and shift problems/weird acting

    What linkage are you referring to?
  15. NickTransmissions

    4L80E Information Thread

    There are some situations having the TC remain in lock up through cruise-down can be detrimental but I don't yet know the specifics so won't say until I can get some concrete info (hopefully early next week). The stock shaft is reliable to about 850 HP or so depending but around 800 HP is where...
  16. NickTransmissions

    4L80E Information Thread

    Good question. I have a couple inquiries out to some builder/tuner friends of mine so will respond as soon as I hear back (I dont do tuning yet). Meanwhile, others may chime in as well beforehand...
  17. NickTransmissions

    Should I replace?

    One should have been included in your paper and rubber kit aka overhaul kit - perhaps double check....Also, if the 2-3 acc piston you have is plastic, replace it with an aluminum one. If you still cant find it, any local transmission parts supplier will have one for you.
  18. NickTransmissions

    th400 clutch drum steels /

    Ive done it numerous times over the years, never had any issues with performance, function or reliability. If they do have a difference in friction coef, it's not material based on my own personal experience - perhaps yours was/is different...
  19. NickTransmissions

    th400 clutch drum steels /

    Sure, no reason you couldnt. Proper clearance is much more important vs mixing steels with/without coatings . That said, kolene-coated steels arent generally needed in a TH400 unless you're doing something really heavy duty-oriented.
  20. NickTransmissions

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

    Bumping this thread with a new video on 700R4 and 4L60E Forward Drum Repair...The most common pattern failure, by far, is the 3-4 clutch pack burning up...The primary reason for this in my view, is leaks developing at the base of the input shaft where it's pressed into the drum...Over time...
  21. NickTransmissions

    Help diagnose squeak/squeal?

    Get the truck up on all four jack stands (or a lift), put the key on, engine off thn shift the trans into neutral. Then go under the vehicle and spin the drive shaft clockwise as it would spin when in Drive - if you hear squealing sound coming from the transmission, record it the post it to...
  22. NickTransmissions

    tranny mount/crossmember- urgent help needed

    Your local pick and pull junk yard.
  23. NickTransmissions

    4L80E Clearance Issues?

    I'm not Bextreme but if you can tell me how you plan on using the vehicle, engine power, frequency of high rpm use, frequency of heavy towing/hauling (if any), i can tell you what transmission, of the ones listed above, will meet your needs, given you're weighing ease of installation...
  24. NickTransmissions

    Should I replace?

    Hmm..not likely you completely burnt it up as described by failing to check fluid level, unless you have reason to believe it was leaking and low to begin with. I ask as the forward clutch is always applied when you're in a forward pattern range position (Drive, D2 and D1 aka Manual Low) so it's...
  25. NickTransmissions

    Th350 spews fluid

    Do you hear any pump whine or other unusual noises or experiencing drivability symptoms? If not, it shouldn't hurt anything to continue driving it...some fluid may vent from the tube on the top of the case as it relieves the excess. Also, please quote my post when you reply - I don't get...

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