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  1. #1
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    Double Clutch or Not?

    Am buying a M2 with Eaton-Fuller 10 speed. I looked on eaton fuller web site and they have a couple of videos on learning to drive a 10 speed tranny. They seem to suggest one should always double clutch when shifting gears. I used to drive a 10 speed roadranger and I only used the clutch when taking off. Has something changed or are they saying that cause they are afraid of new inexperienced driver who might tear up the tranny? Was I slowly destroying my 10 speed roadranger not using the clutch?

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  4. #2
    Senior Member arkjarhead's Avatar
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    Re: Double Clutch or Not?

    I was always told double clutching would wear your clutch out faster. Go figure. All the mechanics I've ever talked to always told me unless you were constantly grinding the gears it was alright to float the gears. I guess it depends on your style. Some may not agree with me. I've never known how to double clutch. When I was training I tried and my trainer finally told me to just float them because I did it better that way. He had 15 years under his belt so , as a rookie, I trusted him.
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  6. #3
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    Re: Double Clutch or Not?

    If when you shift without the clutch, the gears grind OR it seems like you have to push or hold the shifter a bit to force it in to gear...you should double clutch.

    If you can shift and the shifter just kinda falls into gear you can shift without the clutch. (this means you're doing it perfectly).

    Always a good idea to use the clutch when the transmission is cold first thing.

    If you have a smaller truck with a 6 or 7 speed, Don't double clutch. Your transmission is most likely fully synchronized (like a car) and double clutching won't allow the sychro's to do thier work. These transmissions can be shifted without a clutch as well but are much easier to abuse (the transmission won't fight back if you're doing it wrong). If you have a little transmission and it seems to need double clutching, it means she's all wore out on the inside.

    BTW, you're right about the Eaton video, they gotta assume that it's all rookie's watching it.

  7. 3,235449,30170,8
  8. #4
    Senior Member arkjarhead's Avatar
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    Re: Double Clutch or Not?

    Correct me if I'm wrong Piper. Lets say you are shifting from 1st to 2nd gear. The first time you clutch is actually to disengage 1st gear, and then the 2nd time you clutch is to engage 2nd gear? Or is that wrong? It always had me confused.
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  9. 4,235452,30170,8
  10. #5
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    Re: Double Clutch or Not?

    You gotta it right Ark, double clutching is once to take it out of gear, release, clutch again to put in in the next. And all done fairly rapidly.

  11. 5,235555,30170,8
  12. #6
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    Re: Double Clutch or Not?

    So men what you are saying is that if I choose to shift without the clutch and Im not grinding the gears then Im not doing anything that would hurt the tranny at all right? I got the impression from the Eaton videos that only double clutching would suffice for their transmissions. Thats a lot of leg work, more than I plan on doing for sure.

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  14. #7
    Senior Member arrbsthw's Avatar
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    Re: Double Clutch or Not?

    Quote Originally Posted by brann524 View Post
    So men what you are saying is that if I choose to shift without the clutch and Im not grinding the gears then Im not doing anything that would hurt the tranny at all right? I got the impression from the Eaton videos that only double clutching would suffice for their transmissions. Thats a lot of leg work, more than I plan on doing for sure.


    I have driven an Eaton 10 speed for 10 yrs now and I shift
    either way. I can double shift when I want and shift with the
    rpms.. It has not effected the tranny in any way.

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  16. #8
    Senior Member nightcreacher's Avatar
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    Re: Double Clutch or Not?

    you push the clutch in to stop the sincronizers and gears from turning,taking the shifter out of that gear,pushing clutch back in gets the sincronizers,and gears lined back up so you can go to the next gear,raisng the rpms while dbl clutching lets you down shift,lowering rpm lets you up shift

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  18. #9
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    Re: Double Clutch or Not?

    I'm assuming you all know once you get rolling the clutch does not have to go all the way to the floor when shifting . Less than 1/2 way will do .

  19. 9,236046,30170,8
  20. #10
    Senior Member Moot's Avatar
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    Re: Double Clutch or Not?

    If God gave you a left foot, use it! Unless of course you don't own the truck, then scratch away.


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  22. #11
    10K Member cheri1122's Avatar
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    Re: Double Clutch or Not?

    I DO use my left foot: for picking up the stuff I drop on the floor, especially in the dark. The day I learned to float the gears will always be one of my favorites, and my left knee is eternally grateful, too.

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  23. 11,236147,30170,8
  24. #12
    Senior Member Jefferson3000's Avatar
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    Re: Double Clutch or Not?

    Quote Originally Posted by cheri1122 View Post
    I DO use my left foot: for picking up the stuff I drop on the floor, especially in the dark. The day I learned to float the gears will always be one of my favorites, and my left knee is eternally grateful, too.
    Cheri,

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  26. #13
    18K Member greg334's Avatar
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    Re: Double Clutch or Not?

    I don't get it? Why double clutch a synchronized trans?

    I have to double clutch when I am really in a hurry (which is never) because my trans does not have syncros in it and as bad as this sounds, I like it that way.

    Which reminds me, I have to adjust my clutch.

  27. 13,236162,30170,8
  28. #14
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    Re: Double Clutch or Not?

    You know all these years of building transmissions and they haven't built one that works the way we drivers want. I'm positive the guys who desgin these things have never driven one in slow hour traffic on a highway through a city.

    For me it always was clutch when cold and slide it afterwards and only clutch when stopping or reversing. Otherwise once rolling in first and not in a hurry I've slide the shift to every other gear up or down and haven't blown any standard trannys after my first one when I didn't know (teenager) about sliding it right when the clutch went. After that no more broken standards. Autos now that's different. I even shift those things.

    All the truckers I know either slide it when rolling alright or slip the clutch a little (half or less depression of clutch pedal). Even when using the split shift they usually in traffic only slightly depress the clutch to let it change. Now several have hundreds thousands of miles on their transmissions and no problems.

    I guess we do what works for each of us.
    Rob

  29. 14,236164,30170,8
  30. #15
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    Re: Double Clutch or Not?

    Quote Originally Posted by greg334 View Post
    I don't get it? Why double clutch a synchronized trans?

    I have to double clutch when I am really in a hurry (which is never) because my trans does not have syncros in it and as bad as this sounds, I like it that way.

    Which reminds me, I have to adjust my clutch.
    Just remember folks, even though your Eaton 8 speed and up has synchro's in it, it is NOT a synchronized transmission.

    The only fully synchro transmissions are the 7 speeds and under, the model numbers all start with "FS". These puppies do not need to be double clutched unless they are wore out or you are trying to powershift your FL70 like a dragster.

    Sorry greg, couldn't resist the dragster FL70 jab.

    cheri, you can pick stuff up with your feet while you drive? That's the kinda talent my grandpa woulda seen and said "she's a keeper".

  31. 15,236186,30170,8
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