4R70W

Discussion in 'Transmission Forum' started by Whitecougar, Aug 21, 2016.

  1. Whitecougar

    Whitecougar Full Member

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    Please fill out the following to ask a question.

    MAKE:Ford
    MODEL: F150
    YEAR:97
    MILES: 250000
    ENGINE: 4.6
    DESCRIBE ISSUE.... Started truck and had no forward movement until approximately 2800 RPM. Have reverse and had no previous issues with shifting or trans. Checked fluid and changed fluid and filter just to make sure it had the right fluid due to a line change by another mechanic.
     
  2. kev2

    kev2 wrench

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    scan for codes, yes even if light is out.

    you have checked fluid- color, quantity?

    do you have Reverse?

    Do you have D1 - moving lever to low?
     
  3. nickb2

    nickb2 Wrench. I help when I can

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    As Kev said, scan for KOEO and KOER codes first.

    If none, try a few things on this chart, like forward drive line pressure readings.

    Shift linkage etc. This chart is for delayed/soft forward concerns.

    Screenshot (832).png
     
  4. nickb2

    nickb2 Wrench. I help when I can

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    Here are locations for the line pressure taps. I am assuming it is a vin "W" engine. Anyway, even if it is a SOHC, same tap ports apply. Just need to know if it is a E4OD 4spd A/T.

    Screenshot (833).png Screenshot (834).png
     
  5. nickb2

    nickb2 Wrench. I help when I can

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    If you have good reverse, that normally means the torque convertor is transfering fluid properly. So tapping the forward line pressure is a must.

    You can also do air pressure tests. See snapshot below, apply air pressure to forward clutch, you should hear a thud. But you need a test plate for that. Not readily available.

    Screenshot (835).png
     
  6. bp042665

    bp042665 hunting nut

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    with my expert opinion pressure test is a must on these you could have a stripped input shaft on the forward drum if pressure is good suspect the shaft or just worn out clutches
     

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