Jmod questions

Discussion in 'Tech Articles, How-To's & Write Ups' started by don grant, Sep 10, 2019.

  1. don grant

    don grant New Member

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    Trying to do the jmod on my 94 mark 8 , i have the new pistons , gaskets ect .. but cant find a diagram of the separator plate drill sizes and hole numbers , the write up i found on here has no pictures what so ever , i have looked everywhere , any help would be great , im ready to put it back together , Ive found everything but the pre 96 models
     
  2. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    I have a gasket for a AODE and a 01+ Ill compare them when I get home. Ill send you a link to the video I use too, IIRC he talks about which shift is affected by the holes being drilled.



    Hope this helps a little bit.
     
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  3. don grant

    don grant New Member

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    Last edited: Sep 11, 2019
  4. 07GtS197

    07GtS197 Well-Known Member

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    The 92.5+ aode, 4r70w and 4r75e are all part of the same family and very similar. The aode can be j modded just like the 4r70w but there are a few differences. Im not sure if that video shows them but I believe this article does.

    https://www.tccoa.com/articles/tranny/transmission/page1.shtml

    That was written by Jerry, the guy who created the J mod by the way.


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  5. don grant

    don grant New Member

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    Mine is the 4r70w and i have tried to look at this a few times, all i ever get is error messages from that site
     
  6. 07GtS197

    07GtS197 Well-Known Member

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    In the mustang they werent called 4r70w until 96 but thats not really relavent. You do have the aod gearing though instead of the 4r70w gearing.

    When I pulled up that link it was giving me issues too but I figured it was only on my end. But the point is that its the same.


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  7. don grant

    don grant New Member

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    I have no clue what the gearing is , its the metric trans , they upgraded the trans VB in 96 , they used this one in the 93-95 mark 8s , all parts called for 4r70w
     
  8. RAU03MACH

    RAU03MACH Well-Known Member

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    I have done this mod on a 98 gt mustang with an automatic transmission
    Street and strip [email protected] shift improvement
    I have the hole pattern for the drill sizes
    It might be the the same
     
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  9. 07GtS197

    07GtS197 Well-Known Member

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    If its stock it has the aod gearing but thats not important. The point is that the jmod is the same whether its a pre 96 or later 4r transmission.


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  10. don grant

    don grant New Member

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    can you post photos , i have found a couple different post with different holes and sizes , this is whats confusing , and also the fact that my separator plate seems to be missing 1 hole
     
  11. D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    You can run different size holes for different power levels.


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  12. RAU03MACH

    RAU03MACH Well-Known Member

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    I will look for that sheet first thing in the morning hopefully it will help you out
     
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  13. RAU03MACH

    RAU03MACH Well-Known Member

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  14. don grant

    don grant New Member

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    Yes it helps , tho i may not drill the holes , because i found some metal flakes on the magnet , quite a bit , I think im just going to install the new shift pistons/springs and filter and see how it does, also the after market drain plug i bought , I dont understand why the trans was so dirty when it was owned by a 78 year old woman who had it almost 25 years , and said she had never even had it over about 60 mph , and she serviced it regularly
     
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  15. RAU03MACH

    RAU03MACH Well-Known Member

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    Yup that's a lead foot granny
    Do you have a sampling of how much meatal that came out could be the band's breaking in and the fluid was never changed or it could be disc in the pack
     
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  16. don grant

    don grant New Member

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    It wasnt too much , maybe 1/2 a teaspoon if i had added it all together , maybe less then that , 2 longer strands , maybe 1 inch long , it had been changed at least once because the idiots didnt reuse the stock gasket , they may have never cleaned the magnet either , the filter was in the pan when i dropped it, the fluid wasnt too bad,,not burnt but dirty , think i should go ahead and mod it ? 1 spring was also broke , but everything else looks good , It was working good when i bought it,,i had to drive 150 miles home , later that night i jumped on it and i heard a pop ,,pretty sure thats when the spring broke,,and it started haveing problems
     
    Last edited: Sep 16, 2019
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  17. RAU03MACH

    RAU03MACH Well-Known Member

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    Flush it and try it
    Could be it never got completely cleaned out
     
  18. 07GtS197

    07GtS197 Well-Known Member

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    Remember to use mercon v when filling it back up. Im guessing it was the 1-2 shift spring? Thats a common problem.


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  19. RAU03MACH

    RAU03MACH Well-Known Member

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    I never did have any problems with mine and I did use the [email protected] transmission oil recommended for it
     
  20. 07GtS197

    07GtS197 Well-Known Member

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    At least in the p71 world the 4r70w is known to break those springs and usually the owner doesnt know until they pull the valve body for whatever reason. I forget whether its the upper or lower spring that will affect shift firmness more though. One of mine was probably broken on my old 98 p71. That thing could chirp the tires on the 1-2 shift if I gave it some gas lol and the transmission was untouched.


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