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Why is there no lockup converter for the TH400 ??

Discussion in 'The "Juice Box"' started by 69GS400s, Dec 30, 2007.

  1. 69GS400s

    69GS400s ...my own amusement ride!

    ...just curious.
     
    69GS400s, Dec 30, 2007
    #1
  2. BuickBuddy

    BuickBuddy Registered V8 Offender GK

    I have one in my van.. It's a TH400 with overdrive. But you need a computer to control the solenoids that engage the lockup clutch..
     
    BuickBuddy, Dec 30, 2007
    #2
  3. DaWildcat

    DaWildcat Platinum Level Contributor

    David, do you have something aftermarket for the TH400, or are you referring to the later 4L80-E (or 4L85-E) tranny? I've never heard of any lockup parts for the TH400.

    Devon
     
    DaWildcat, Dec 30, 2007
    #3
  4. BuickBuddy

    BuickBuddy Registered V8 Offender GK

    It's the 4L80.. The next gen th400. Pan even looks similar..

    It's just not practical to make anything like this for the th400.. You need a computer and sensors to run it. It would burn up if engaged all the time.

    That's what the tow/haul button is for.. To shut it off while towing.
     
    BuickBuddy, Dec 30, 2007
    #4
  5. DaWildcat

    DaWildcat Platinum Level Contributor

    I thought so...I haven't seen anything like that for the ol' 400. I do remember seeing a TH400 cut & modified with a manual clutch, though - no more torque converter. I think they were tried for a while in some different racing classes during the early '70's. There's even a short writeup on them in Ron Sessions' TH400 book.

    Infinitely variable stall speed (with no torque multiplication), plus lockup.

    Devon
     
    DaWildcat, Dec 30, 2007
    #5
  6. GS464

    GS464 Hopelessly Addicted

    They called them "Clutch-Turbo"
     
    GS464, Dec 30, 2007
    #6
  7. 69GS400s

    69GS400s ...my own amusement ride!

    a 700R4 has non-computer lockup, doesn't it ?? and how about Gessler ... isn't he running a th350 with a lockup converter ??
     
    69GS400s, Dec 31, 2007
    #7
  8. DaWildcat

    DaWildcat Platinum Level Contributor

    TH350-C is a lockup trans and can be built for strength like any TH350. TCI and Hughes have performance lockup converters available. The special TH350-C input shaft won't work with TH400.

    Devon
     
    DaWildcat, Dec 31, 2007
    #8
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    LARRY70GS, Dec 31, 2007
    #9
  10. bobc455

    bobc455 Well-Known Member

    Since that article in the GS-Xtra, I have not heard of anyone who uses it. Not even sure if the kit is still available.

    The way the article was written, it sounded like the convertor was designed more for drag racing than for daily drivers.

    -Bob C.
     
    bobc455, Dec 31, 2007
    #10
  11. DaWildcat

    DaWildcat Platinum Level Contributor

    DaWildcat, Dec 31, 2007
    #11

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