Here are the instructions for adjusting the shift cable, basically put the lever in overdrive and have someone push against it to hold it in place, then loosen the nut at the cable on the transmission, the cable will move a little, then tighten the nut.
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Are you saying have someone push against the shifter so it doesn't move from the overdrive position while the nut at the cable is loosened, then tightened?
You Got it!
Best of luck my friend!