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  1. 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...
  2. 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...
  3. 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...
  4. 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.
  5. 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.
  6. 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...
  7. 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...
  8. 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
  9. 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?
  10. 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.
  11. 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.
  12. 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/
  13. 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...
  14. 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...
  15. NickTransmissions

    Looking to swap a 1979 Bonanza to an Automatic Overdrive

    700R4 is the most straight forward and cost effective swap.
  16. 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.
  17. 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...
  18. 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...
  19. 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...
  20. 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...
  21. 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...
  22. 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...
  23. NickTransmissions

    4L80E Clearance Issues?

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

    TH400 drive off and shift problems/weird acting

    What linkage are you referring to?
  25. 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...

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