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  1. #1

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    SC2 Automatic - Input Shaft Nut?

    I just replaced the valve body on my 01 SC2A.

    I did not check the input shaft nut, deciding to first see if it is needed before diving into that.

    The first ten miles of driving or so were very smooth. But then it started in with intermittent harsh shifting, and I lost reverse once when it it was hot.


    Is it likeley that the input shaft nut is loose? Or might I be looking at something else?

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    6S Resident Hasselhoff. alexofnazareth's Avatar
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    If the thing has been slamming away during shifts, its likely that he nuts are loose.
    Quote Originally Posted by Donnie View Post
    I see a failboat, steaming full speed on an ocean of failsauce into a barrier reef of lol.
    Quote Originally Posted by BC. Livewire View Post
    if you hate seeing money going down the drane

    than do not turbo your car !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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    Thatís what I was afraid of. I was hoping that the PO didnít drive it for very long in that condition.


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    6S Moderator S.Bretz's Avatar
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    A good tell of a loosen input shaft nut is a delayed first shift into reverse and then a harsh engagement when it finally does shift into reverse.
    If that is what is happening then pull the side cover and remove the nut. CLean the thread of the nut and shaft and then reinstall with some loctite and hammer it on really good with an impact gun. You shouldn't have any problems after that.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

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    They donít make that nut any more. But it seems to me that any similarly threaded input shaft nut from another car that fits into the space with a socket ought to work.

    What do you guys think?


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    Quote Originally Posted by S.Bretz View Post
    A good tell of a loosen input shaft nut is a delayed first shift into reverse and then a harsh engagement when it finally does shift into reverse.
    It did something like that, but only after it got hot, then I shut the car off for maybe 2 minutes, and the shifting improved a lot.

    It started out with gradually harsher shifts in D then a couple hard thunks into R. After it sat a while it returned to smooth shifting for the short drive home.


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    6S Resident Hasselhoff. alexofnazareth's Avatar
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    Just reuse the same nuts you have. Add loctite and you're good to go.
    Quote Originally Posted by Donnie View Post
    I see a failboat, steaming full speed on an ocean of failsauce into a barrier reef of lol.
    Quote Originally Posted by BC. Livewire View Post
    if you hate seeing money going down the drane

    than do not turbo your car !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    -----------------------------------------------------------------------------------------------------

    Sixthsphere: Home of newbs, cunts, and Shane Jackson.

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    Quote Originally Posted by alexofnazareth View Post
    Just reuse the same nuts you have. Add loctite and you're good to go.
    Thatís what Iím planning to do. But Iím also going to take some measurements while itís apart so another solution can at least be looked for.


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    6S Moderator S.Bretz's Avatar
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    There are a couple of o-rings on the cover that slip into the hole that the input shaft nut is in. If those collapse they can cause shifting issues.
    When I was working at saturn, we would replace those seals and the input shaft nut at the same time. I will caution you though. There was a special tool kit for the seals to spread the out to fit on the little drum thingy and then a resizer that shrunk them back down. I'm not sure how you would do it without the special tool.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

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    The ball joint wonít budge. Iím using a pry bar on the top and a hammer to the side.

    Any other way to get that thing off?


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    Naturally one minute after I post the question it pops loose. :-)


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  12. #12

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    SC2 Automatic - Input Shaft Nut?

    I have the end cover off now. There is only an itty bitty amount of play in the clutch. Not even enough to detect with one hand. Itís only noticeable if I grab it on two sides and wiggle it.

    I can move it back and forth about a millimeter.

    Is that normal?

    Should I leave it alone?

    Or should I pull the nut anyway and torque it down?


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    Last edited by TwoFistedJustice; 02-25-2019 at 07:22 PM.

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