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I can tell you for a fact it is not an 4L80E, the "E" stands for electronic and there are no wire connectors on an 1989. Installing a 4L80E in an 1989 would require changing a lot of wiring harnesses and the computer for your truck. Good luck.

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12y ago
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Q: What transmission is in a 1989 Chevy k2500 4x4 automatic?
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