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Manually locking up the torque converter

Discussion in '2nd Gen. Tacomas' started by S.B., Oct 19, 2012.

  1. S.B.

    S.B. [OP] Well-Known Member

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    Has anyone ever done something like thing on our A750 trans? How well does this tranny respond to this?

    I've been researching valve body upgrades and came across a company called West Coast Cruisers. They sell a "kit" that with a flip of a switch will lock up/keep the torque converter locked up, but they want over $200. http://www.westcoastcruisers.com/transfer.php

    I think I have figured the wiring out for this, just need me a relay.

    I figure this would really help towing and goin slow down hill.
     
  2. 650H1

    650H1 Well-Known Member

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    what are the benefits of this? and are the potential benefits worth 200 bucks?
     
  3. S.B.

    S.B. [OP] Well-Known Member

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    My thinking is:
    -Less heat build up from the torque converter, especially when going slow and loaded up.
    -Can control down hill speed, like a manual, better


    I wouldn't buy the "kit". I would do it my self for like $30

    I'm just wondering if anyone has done this and if anyone thinks there would be adverse effects?

    I know on the older dodge diesel auto, you had to do this kind of mod unless you wanted to replace the tranny all the time.
     
  4. ItalynStylion

    ItalynStylion Sounds Gooooood

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    That kit looks like a $5 rocker switch wired to a $3 relay...


    Interested to hear more about the principle. It would help with gas mileage too I would think. (highway)
     
  5. S.B.

    S.B. [OP] Well-Known Member

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    exactly.

    I just wonder if anyone here has done it. I've been searching other forums (IH8MUD, TTORA, XRU, and here), but have come up with nada.
     
  6. chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, lots of buttons, and yellow flashing lights on the dash.
    The tranny not only locks and unlocks, but can achieve different levels of "lock up" in gears 3 thru 5. Toyota seems to have gotten it right, so I cant see a reason to mess with it.
     
  7. VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    Chris, as always, is right on the money with this one.

    "If it ain't broke, don't fix it."
     
  8. S.B.

    S.B. [OP] Well-Known Member

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    U think their would be any adverse effects?
     
  9. 650H1

    650H1 Well-Known Member

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    so this would lock the transmission into one gear and not let it shift? that has the potential to be awesome...
     
  10. VirginiaBound

    VirginiaBound Whyareyoureadingthis?

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    No, it's just preventing the transmission from releasing into a coast.

    The transmission will constantly be engaged to the drive-train.
     
  11. chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, lots of buttons, and yellow flashing lights on the dash.
    I dont know. There could be.
     
  12. S.B.

    S.B. [OP] Well-Known Member

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    No, just so it "acts" like a manual in a sense. It locks the converter so that it will not do partal shifts, it will stil shift.
     
  13. 650H1

    650H1 Well-Known Member

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    well our downhill assist BS is practically the same thing. i actually think its obnoxious when i tap my brakes going downhill and it shifts down on me instead of coasting.
     
  14. S.B.

    S.B. [OP] Well-Known Member

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    I can see there some if its used incorrectly, but my intensions are going down hill and towing, except for starts.
     
  15. S.B.

    S.B. [OP] Well-Known Member

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    But this has the potential to acctually slow the truck down, unlike now where it may down shift but unlocked which does not slow it much, just builds a lot of heat (I think). I'll be installing my tranny temp gauge this week and I'll check on the temps.
     
  16. 650H1

    650H1 Well-Known Member

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    could you just leave it locked all the time?
     
  17. S.B.

    S.B. [OP] Well-Known Member

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    I don't think so, cause from starts or coming to a stop, I think it would stall.
     
  18. Rich91710

    Rich91710 Well-Known Member

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    Slow and loaded up, the TCC is not locked anyways.
    Depends on the vehicle, but most will only lock in direct and overdrive... some of the 5 and 6 speeds will lock in 3rd or 4th, but under any moderate load at all, it unlocks.
    Locking under those conditions is going to be hard on the driveline.

    Downhill speed control is a benefit, but the 2nd Gen system is already pretty tight... I don't think the TCC is unlocking.
     
  19. S.B.

    S.B. [OP] Well-Known Member

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    With going slow, ya the tc is not locked thus creating a lot of heat.


    I don't believe that the tc is ever locked with down shifting to control down hill speed.

    But I think I might tackle this this weekend. I'll update this as I learn more about it.
     
  20. badger

    badger Well-Known Member

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