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Manual transmission Fan Club and BS thread (All Generations Welcome)

Discussion in '3rd Gen. Tacomas (2016+)' started by nevadabugle, Dec 21, 2015.

  1. Aug 10, 2018 at 7:22 AM
    #8661
    davesaddiction

    davesaddiction Member

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    Nice! What was your main motivation for the change?
     
  2. Aug 10, 2018 at 9:21 AM
    #8662
    shackley

    shackley Well-Known Member

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    I preferred an ACC, but no MT, and after driving the OR for over a year I just can't get into the automatic. I never had an auto truck. I no longer need the long bed (long story), and Karl Malone is giving a good deal on the Pro MT and the trade, so that's it. I removed the RCI sliders from the 17 and will put them on the Pro. Not much else, the BAK tonneau cover and Falken tires. Thats' about it. I'll be selling the cover for the 17 and the TRD Baja suspension that I have new in box that I never installed. Also, the diff gears in the MT are substantially lower. I do notice the difference on some of the steep rocky trails with the higher gears in the 17. Buying the 17 was a mistake on my part, and one that is costing me.
     
    Beemaster, shakerhood and tonered like this.
  3. Aug 10, 2018 at 10:02 AM
    #8663
    davesaddiction

    davesaddiction Member

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    I knew a few minutes into the test drive that I couldn’t live with that automatic!
     
    shakerhood and tonered like this.
  4. Aug 10, 2018 at 10:13 AM
    #8664
    INSAYN

    INSAYN Well-Known Member

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    After all that chatter from you in the LB vs SB thread and how "superior" your truck is, I am really beginning to wonder about your choices man.
    Who buys a house with a driveway that slopes so steeply towards the house, did you not notice this before you moved in?
    Can you even drive a manual? You probably should have bought an auto. :facepalm:
     
  5. Aug 10, 2018 at 12:03 PM
    #8665
    specter208

    specter208 Well-Known Member

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    Ok, what's your point.
     
  6. Aug 10, 2018 at 3:00 PM
    #8666
    Zacowacko

    Zacowacko Well-Known Member

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    I get a rattling under hard acceleration, at low RPM in all gears. Thought it might be spark knock (pinging), so i ran a few tanks of 91, no change. I now think its some kind of heat shield or something making the noise, but haven't been motivated enough to try and track it down.
     
    specter208 likes this.
  7. Aug 11, 2018 at 7:59 AM
    #8667
    deusxanime

    deusxanime Well-Known Member

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    In the tranny temp monitoring thread, I asked whether the PIDs for use in Torque Pro would work with the MT also. They seem surprised I'd even asked and now I'm not sure if I'm just being silly. Do you need to worry about the MT temps when towing, etc, or is that just 100% not a concern with MT since there is no converter fluid?
     
  8. Aug 11, 2018 at 8:16 AM
    #8668
    INSAYN

    INSAYN Well-Known Member

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    There really isn't a way to generate lots of heat in a manual transmission. Low or no transmission oil can cause unnecessary friction thus heat, but that's about it.
    If the load is too heavy the clutch will be the sacrificial component with a manual. Similar to the torque converter in an auto.
     
    tonered likes this.
  9. Aug 11, 2018 at 10:33 AM
    #8669
    thdrduck

    thdrduck Well-Known Member

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    Mostly right. A clutch and associated parts are not meant to "slip" under load. A progressive load, such as towing up a hill will kill the engine before the clutch slips (if everything is in good working order). The likely sacrificial parts will be of the overdrive, 5th and 6th in a 6 speed or 5th in a 5 speed. Overdrive is not meant for towing, it is meant for fuel economy.
     
  10. Aug 11, 2018 at 11:48 AM
    #8670
    specter208

    specter208 Well-Known Member

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    I've actually asked before if 5th gear was safe for towing in the 6MT. It is implied that 5th is safe for towing in the manual as it states 5th may be used for engine braking and for vehicle charging.
     
  11. Aug 11, 2018 at 2:09 PM
    #8671
    deusxanime

    deusxanime Well-Known Member

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    I've heard that you should mostly stay in 4th when towing and could maybe go into 5th if you are on a truly straight and level part of the freeway. Then you can cruise in it. But really should go back to 4th if there's any grade.
     
    Last edited: Aug 11, 2018
  12. Aug 11, 2018 at 2:40 PM
    #8672
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    Unexceptional
    I've never really treated overdrive gears special, if the engine and truck aren't struggling then I'll use 5th (and now 6th). I keep the RPMs up if the truck is working but otherwise I figure if the grade is flat then there's nothing wrong with letting the RPMs come down and save some gas. If there's no torque being developed, e.g. very little throttle, then everything's just spinning. It's when the engine is being given a lot of fuel so a lot of energy is being converted into torque that you create the damage to the transmission.

    My feeling is you don't have to treat it any different just because you're towing, it's really that you don't want to abuse your transmission under any conditions. For example, maybe you don't have a trailer but are heavily loaded for camping or there's a crazy headwind then you should be careful about not using high gears, low RPM then either. The same issues arise with people who put big tires on their trucks without re-gearing to match. They tend to wear out OD gears and sometimes other gears. For example my old truck had a W56 5-speed and 3rd and 5th would both wear out from damage like this. I'm not a mechanical expert but I understand it's got to do with the countershaft bearings and the constant run gears.

    How I determine this is more a feeling from experience, but if I can't accelerate in the selected gear or find myself getting beyond 75% throttle a lot then I'll downshift. IOW, my top gear and cruising speed is conditional with the situation. On flat Interstate with very little wind I might be fine with 6th gear (assuming it's safe to travel that fast with your load, which is a different question), but with a headwind the truck has to work too hard to hold 6th so I travel in 5th at a speed appropriate for the RPMs. But climbing a pass at altitude I might not be able to use gears above 4th or even 3rd sometimes. There's been times when even WOT in 4th isn't doing it, so I'll sit in 3rd gear at 40 MPH for 15 minutes until I get to the top.
     
    OpelGT likes this.
  13. Aug 11, 2018 at 2:44 PM
    #8673
    INSAYN

    INSAYN Well-Known Member

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    The clutch being the designed point of slipping would be where any heat (if any) will be generated. I guess I over generalized my reply.

    Yeah, if the driver doesn't work the clutch before stalling, the engine will chug to a halt. If he allows the clutch to slip due to excessive weight on a steep hill, he could expect some extra wear on the clutch (and heat at the clutch) for sure.
     
  14. Aug 11, 2018 at 3:03 PM
    #8674
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    I'd doubt Toyota would intentionally design a clutch to slip. Perhaps, but seems like you'd want the transmission to tolerate more than the engine can develop and the clutch to be higher than at least the engine and probably the transmission's limit as well. The clutch is the thing in the system that you can count on to wear so that it's holding threshold will come down over time.
     
  15. Aug 11, 2018 at 3:33 PM
    #8675
    specter208

    specter208 Well-Known Member

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    Swapped my tranny fluid yesterday with Redline MT90. Old fluid came out Caramel color. Replacement oil was a light transparent fluid with a orange/pink hue to it. If my 6MT was shifting smooth before, it is shifting much better now. No more occasional notchyness on some gears.
    reverse goes in with little effort now
    1st gear feels easier to shift into
    2nd gear engages much quicker and smoother now
    3rd gear no more occasional notchyness, 5th gear feels butter smooth and gets sucked into gear quickly

    image.jpg
     
  16. Aug 11, 2018 at 3:43 PM
    #8676
    Wsteven

    Wsteven Well-Known Member

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    I can't Drive something with that Darn Automatic thing in it the Last time I did I tried to Down Shift for a stop sign....... I stopped alright about 45 foot from the sign with everyone yelling at me because I tried to push the Brake pedal to the floor in order to down shift. Both My Tacoma's have Manual Transmission and everything I have had except a Tundra has been Manual.
     
  17. Aug 11, 2018 at 6:52 PM
    #8677
    specter208

    specter208 Well-Known Member

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    These transmissions are tuned for so much fuel economy they program it to downshift as little a possible I imagine. Better fuel economy at the cost of more wear on your brakes and rotors. The only automatics that I've driven that downshift more frequently amd intelligently are in commercial trucks with Allison series and Aisin.
     
  18. Aug 11, 2018 at 7:42 PM
    #8678
    INSAYN

    INSAYN Well-Known Member

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    Exactly. The clutch is the designed point of "give" in the system (slip). This does not mean it is designed to slip on it's own without user input (unless worn, or pressure plate is worn). It is just the item in the system that is predetermined to transfer power from the motor to the transmission with slip in mind to get things going.
    Yes, we all slip the clutch slightly when we get moving. The amount of slip is completely up to each user.
     
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  19. Aug 11, 2018 at 7:43 PM
    #8679
    specter208

    specter208 Well-Known Member

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    I imagine clutch torque and horsepower rating are lower than the transmission it self.
     
  20. Aug 11, 2018 at 8:02 PM
    #8680
    INSAYN

    INSAYN Well-Known Member

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    Absolutely.
    I would venture to guess that this manual transmission could easily handle 400 to 500hp, but highly doubt the clutch could handle it for very long, or at least the pressure plate wouldn't have the spring rate to hang on very long. Toyota manuals transmissions and rear axles have always been farely stout.
     
    specter208 likes this.

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