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Swapping a 4l80e in to a 1982 G20 wiring help


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Put a 1994 4l80e transmission in to my 1982 G20, Not wanting to put in a tune port is there a better way to wire it up without  switching everything over and making it to a manual  shift is what I want to do. I tried one way by just twisting A,N,R wire together and the B,P wires together and the E, wire to the ignition fuse link. It worked for a little while but now seems to be stuck in only one gear. So is there a better way without spending more money . I do have the TCM out of the same van i got the transmission from.

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