In the 90 gmc sierra what transmission is used?

sniperlif3

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Well ihave a 1990 gmc sierra 2wd that has a chevy 350 small block and im not sure whether they used the 4L60E/4L60 transmission in the 90 model or if they used the 700R4. Would someone be able to help me out by telling me which one i have?

I am also curious, would the 4L60 and 700R4 fit on all of the small and big blocks? Also would the 4L80E work with a small block, and if so what is the benifit?
 
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