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700r gurus, valve body checkballs

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by arq, Feb 16, 2004.

  1. arq

    arq 1/2 ton status

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    I got my rebuild kit for my 700r a few days ago. Along with that I got a new reverse drum from transmissioncenter.com anyhow, i noticed that the drum is for a 93. my tranny is a 91. the difference is that the hole between the bushings is square(93) vs 0.095" round(87-92).
    I called the guys at transcenter and told me i could put the drum into my 91. I am looking for a second, third, forth, opinion. it's my first 700r, and i don't want to do this twice.
    the atsg manual mentions that there are three different types, "that will not interchange". the 91 uses 2 checkballs vs 3 on the 93. the 91 does not accomodate for a 3rd checkball. anyone have previous experience doing this??

    thanks in advance,

    ARQ.
     
  2. arq

    arq 1/2 ton status

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    anyone /forums/images/graemlins/1zhelp.gif
     
  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    ok heres how it goes. the 82-86 700r4 had this square hole, in 87 they went to a smaller round hole, then in 93 they went back to the square hole with the 4l60e. the square hole is .180 and alows more fluid to create a quicker apply and quicker release of the piston.

    i say go ahead and use the new drum. make sure you follow the specs as the 82-86 uses a steel piston and the 4l60e uses a aluminum piston. you may need one or the other to get the correct specs /forums/images/graemlins/waytogo.gif
     

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