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Transmission 5 Speed automatic write up with pics for second gen 4 liter trucks

Discussion in 'Technical Chat' started by gearcruncher, Aug 7, 2013.

  1. Oct 20, 2014 at 5:36 PM
    #41
    wake100

    wake100 Well-Known Member

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    Where is the info on this flash?
     
  2. Oct 20, 2014 at 8:56 PM
    #42
    gearcruncher

    gearcruncher [OP] Well-Known Member

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    4TH GEAR TO 5TH GEAR UPSHIFT . Reports at TRNI indicate the SLT solenoid has issues .
    http://www.moranbahweather.com/toyot.../m_05_1113.pdf
    The flash also fixes the clunk upshift to 5th gear , however this fix is only for 2012 and up Tacoma,s .
    Toyota has " NOT " released a much needed flash for the earlier Tacomas.
    [​IMG] T-SB-0044-14.pdf

    ONCE again , the Zip kit will seal the hydraulic integrity of the valve body but it will not change the computer controlled shift strategy of the computer in your truck .The Zip kit fixes a crappy designed spool valve in the valve body .This fixes only the valve body issue which is half of the problem .
    5th gear is commanded too early by the ecm , not the valve body
     
    Last edited: Dec 13, 2014
  3. Oct 21, 2014 at 6:10 PM
    #43
    pashka612

    pashka612 Member

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    So the zip kit wont help or will it help? My transmission does not have issues upshifting, it has issues downshifing.
     
    Last edited: Oct 21, 2014
  4. Dec 13, 2014 at 6:20 AM
    #44
    gearcruncher

    gearcruncher [OP] Well-Known Member

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    Are you even reading what I just explained ?
    A downshift issue is totally different than an upshift problem
     
  5. Dec 17, 2014 at 9:36 AM
    #45
    gabe2828

    gabe2828 kickin ass

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    Had a question for you and forgive me if you have already covered it. I looked through all the info you posted about transmission issue but was a little overwhelmed by the amount to find a possibile solution to my situation (although im sure you probably did mention a fix). l drive an 2008 Tacoma Prerunner TRD sport Double Cab with Automatic Trans and the transmission seems to intermittingly slip when going from 3rd to 4th gear. Doesn't always happen but it seems to happen more when its cold or colder weather. Have had it in the dealership off and on during the 2 yrs ive owned it and have heard various reasons but none of which have explained the slip. Fluid has been topped off to appropriate level by dealership but my confidence in the people Ive dealt with at the Toyota dealership is non-existent. If you maybe provide some possible solutions or point me in the right direction it would be greatly appreciated.
     
  6. Feb 22, 2015 at 2:27 PM
    #46
    bdaztacoma

    bdaztacoma Member

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    Link to subscribe
     
  7. Jun 6, 2015 at 10:55 AM
    #47
    dsjacr

    dsjacr Active Member

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    Where the SLU screw located? I cannot find an illustration anywhere for the A750 tranny. Thanks
     
  8. Jun 6, 2015 at 11:10 AM
    #48
    gearcruncher

    gearcruncher [OP] Well-Known Member

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    The screw adjustment is located in the center of the SLU solenoid . The SLU solenoid is mounted to the side of the valve body. Are you absolutely positive you have a converter shudder ? Any recent wiring done to your truck ? Lift kit or aftermarket tires ? Has it been diagnosed correctly ?
     
  9. Jun 6, 2015 at 11:15 AM
    #49
    dsjacr

    dsjacr Active Member

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    Absolutely. Will not shudder in 4th. 7 inch lift with 35's for over 2 years. No wiring done. Thx
     
  10. Jun 6, 2015 at 11:17 AM
    #50
    dsjacr

    dsjacr Active Member

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    The slu should be #6 on the diagram?

    M-TOYOTA-5-1.jpg
     
  11. Jun 6, 2015 at 11:21 AM
    #51
    dsjacr

    dsjacr Active Member

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    Is it this with the Alan head screw?

    0606151320.jpg
     
  12. Jun 6, 2015 at 12:30 PM
    #52
    gearcruncher

    gearcruncher [OP] Well-Known Member

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  13. Jun 22, 2015 at 11:12 AM
    #53
    Maypo

    Maypo New Member

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    Does anyone know how to prevent the A750F from downshifting from 4th to 3rd? I'm trying to dyno some engine modifications and the dyno requires a full acceleration in 4th gear. So far I can only get a reading from about 4,000 to 5,500 RPM due to the downshift.
     
  14. Jun 22, 2015 at 6:35 PM
    #54
    BradyT88

    BradyT88 ┌∩┐(◣_◢)┌∩┐

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    I don't have an answer for you... but what are you running?:popcorn: Stock will redline 4th gear at about 136mph (assuming the speed limiter is disabled and the engine can actually get the truck to that speed).
     
  15. Jun 24, 2015 at 11:51 AM
    #55
    Maypo

    Maypo New Member

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    When I had a baseline dyno run on my brand new Tacoma, I found out that they had no way of running the test through the entire RPM range with an automatic.
    Here is the Power and Torque graph vs speed, you'll notice the limiter cuts in at 87 mph in 4th.

    tacoma_stock.jpg

    I've had the TRD supercharger installed and will have it dyno'd again, if I can keep it in 4th gear without it automatically downshifting, we could get a much better picture of the hp and torque.

    Eventually, I'll install an exhaust and maybe a few other performance odds and ends to see how they help as well.
     
  16. Jun 24, 2015 at 3:07 PM
    #56
    BradyT88

    BradyT88 ┌∩┐(◣_◢)┌∩┐

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    What tires and gears are you running? I can do 80 mph in 3rd gear with 33's and 4.88's.

    With stock gears 3.73's and 31's, you can do about 95 mph in 3rd gear.

    4th gear gets you over the 115 mph speed limiter in both cases


    EDIT: Looks like 28's and 3.73's will cause 3rd gear to redline at about 87 mph.
     
    Last edited: Jun 24, 2015
  17. Jun 25, 2015 at 7:34 AM
    #57
    Maypo

    Maypo New Member

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    It's a 2015 Tacoma Double Cab Long Bed V6 5 Speed Auto with TRD Sport and Tow Package (now with Super Charger). The tires are Bridgestone 265/65R17's, according to manufacturer's site, the diameter is 30.5 inches. The differential ratio should be 3.73, according to the Toyota brochure. And the A750F transmission ratios are as follows:

    A750FGearRatios.jpg

    Using this information, the 87 mph doesn't make sense for 4th gear, does it.

    RPM x 60 / gear ratio / diff ratio x tire circumference in inches * 63360

    topspeeds.jpg

    I'm thinking now that the dyno guy didn't run the test correctly. That was money well spent! ugh.

    Thanks BradyT88. I appreciate you bringing that to my attention.
     
  18. Jun 25, 2015 at 9:35 AM
    #58
    BradyT88

    BradyT88 ┌∩┐(◣_◢)┌∩┐

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    I did a lot of research into gear ratios and such when I was planning on regearing. A quicker way to find the numbers is this calculator ;) but I had done most of it by hand before I found the calculator. The A750F is listed in the drop down menu. Although it looks like you used a calculator for your info as well unless you made your own spread sheet.

    http://www.grimmjeeper.com/gears.html
     
  19. Nov 8, 2015 at 6:07 PM
    #59
    mr2r6

    mr2r6 Well-Known Member

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    I have a question OP. 07 Pre runner running 37s. Got a check engine light and would shudder really bad in OD. I did a drain and fill and it helped for a few hundred miles, I was on stock gears so now I changed to 4.88 gears and it helped a lot. Almost no shudder ever. There are some times when it shudders just when cruising in OD and I still have the CEL. So I did the lube guard and drove all day without shudders, I cleared the CEL and it came back on in a few miles, but no shudders. Any idea why I'm still getting the CEL?
    Thanks for this post its awesome by the way.
     
  20. Nov 8, 2015 at 6:30 PM
    #60
    wake100

    wake100 Well-Known Member

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    Wait? You cleared the CEL and never checked what code it was throwing?
     
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