Question about 1993 GMC Sierra K1500

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I own a 1993 GMC Sierra 1500 4x4 that has a leaking automatic transmission. It is Canadian made (not to sure if it makes a difference) with a 5.7L/350ci V8 with what I believe to be a 700r4 overdrive transmission. From what I've been able to find out it seems that the leak is coming from where the engine meets the transmission, and the leak only occurs at higher speeds (70/80 km/h). After some research I believe it may be the front pump seal, but I am unsure and cannot afford to take it to a transmission shop to have it diagnosed. Please help!

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  • stacyrom Oct 05, 2010

    Usually when warm. By the time I can get to an area where I can go at a higher rate of speed the tranny is already warmed up.



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Its probably the 4L80E trans. Front seal might be possible. Sounds like torque converter to me. Does it still leak at that speed when the tranny is cold? Or just when its warm?

Posted on Sep 13, 2010

  • twrench Sep 15, 2010

    it would be the 700r4 or early 4l60, same thing. the 4l60E took over when the added electronics and the 4l80e was used in some 2500 models but most all were in 1 ton and above.
    you can find more info on the 700r4, 4l60e and 4l80e on



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